CVE-2024-56718 (GCVE-0-2024-56718)

Vulnerability from cvelistv5 – Published: 2024-12-29 08:48 – Updated: 2026-08-05 11:46
VLAI
Title
net/smc: protect link down work from execute after lgr freed
Summary
In the Linux kernel, the following vulnerability has been resolved: net/smc: protect link down work from execute after lgr freed link down work may be scheduled before lgr freed but execute after lgr freed, which may result in crash. So it is need to hold a reference before shedule link down work, and put the reference after work executed or canceled. The relevant crash call stack as follows: list_del corruption. prev->next should be ffffb638c9c0fe20, but was 0000000000000000 ------------[ cut here ]------------ kernel BUG at lib/list_debug.c:51! invalid opcode: 0000 [#1] SMP NOPTI CPU: 6 PID: 978112 Comm: kworker/6:119 Kdump: loaded Tainted: G #1 Hardware name: Alibaba Cloud Alibaba Cloud ECS, BIOS 2221b89 04/01/2014 Workqueue: events smc_link_down_work [smc] RIP: 0010:__list_del_entry_valid.cold+0x31/0x47 RSP: 0018:ffffb638c9c0fdd8 EFLAGS: 00010086 RAX: 0000000000000054 RBX: ffff942fb75e5128 RCX: 0000000000000000 RDX: ffff943520930aa0 RSI: ffff94352091fc80 RDI: ffff94352091fc80 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffb638c9c0fc38 R10: ffffb638c9c0fc30 R11: ffffffffa015eb28 R12: 0000000000000002 R13: ffffb638c9c0fe20 R14: 0000000000000001 R15: ffff942f9cd051c0 FS: 0000000000000000(0000) GS:ffff943520900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4f25214000 CR3: 000000025fbae004 CR4: 00000000007706e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 PKRU: 55555554 Call Trace: rwsem_down_write_slowpath+0x17e/0x470 smc_link_down_work+0x3c/0x60 [smc] process_one_work+0x1ac/0x350 worker_thread+0x49/0x2f0 ? rescuer_thread+0x360/0x360 kthread+0x118/0x140 ? __kthread_bind_mask+0x60/0x60 ret_from_fork+0x1f/0x30
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 19:58 UTC
CWE
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7018 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 541afa10c126b6c22c2a805a559c70cc41fd156e , < bec2f52866d511e94c1c37cd962e4382b1b1a299 (git)
Affected: 541afa10c126b6c22c2a805a559c70cc41fd156e , < 2627c3e8646932dfc7b9722c88c2e1ffcf7a9fb2 (git)
Affected: 541afa10c126b6c22c2a805a559c70cc41fd156e , < 841b1824750d3b8d1dc0a96b14db4418b952abbc (git)
Affected: 541afa10c126b6c22c2a805a559c70cc41fd156e , < 2b33eb8f1b3e8c2f87cfdbc8cc117f6bdfabc6ec (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.8
Unaffected: 0 , < 5.8 (semver)
Unaffected: 6.1.122 , ≤ 6.1.* (semver)
Unaffected: 6.6.68 , ≤ 6.6.* (semver)
Unaffected: 6.12.7 , ≤ 6.12.* (semver)
Unaffected: 6.13 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "cvssV3_1": {
              "attackComplexity": "LOW",
              "attackVector": "LOCAL",
              "availabilityImpact": "HIGH",
              "baseScore": 5.5,
              "baseSeverity": "MEDIUM",
              "confidentialityImpact": "NONE",
              "integrityImpact": "NONE",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
              "version": "3.1"
            }
          },
          {
            "other": {
              "content": {
                "id": "CVE-2024-56718",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-10-01T19:58:28.250334Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "problemTypes": [
          {
            "descriptions": [
              {
                "description": "CWE-noinfo Not enough information",
                "lang": "en",
                "type": "CWE"
              }
            ]
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2025-10-01T20:07:06.436Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-03T20:53:09.586Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/smc/smc_core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "bec2f52866d511e94c1c37cd962e4382b1b1a299",
              "status": "affected",
              "version": "541afa10c126b6c22c2a805a559c70cc41fd156e",
              "versionType": "git"
            },
            {
              "lessThan": "2627c3e8646932dfc7b9722c88c2e1ffcf7a9fb2",
              "status": "affected",
              "version": "541afa10c126b6c22c2a805a559c70cc41fd156e",
              "versionType": "git"
            },
            {
              "lessThan": "841b1824750d3b8d1dc0a96b14db4418b952abbc",
              "status": "affected",
              "version": "541afa10c126b6c22c2a805a559c70cc41fd156e",
              "versionType": "git"
            },
            {
              "lessThan": "2b33eb8f1b3e8c2f87cfdbc8cc117f6bdfabc6ec",
              "status": "affected",
              "version": "541afa10c126b6c22c2a805a559c70cc41fd156e",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/smc/smc_core.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.8"
            },
            {
              "lessThan": "5.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.122",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.68",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.13",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.122",
                  "versionStartIncluding": "5.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.68",
                  "versionStartIncluding": "5.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.7",
                  "versionStartIncluding": "5.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.13",
                  "versionStartIncluding": "5.8",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: protect link down work from execute after lgr freed\n\nlink down work may be scheduled before lgr freed but execute\nafter lgr freed, which may result in crash. So it is need to\nhold a reference before shedule link down work, and put the\nreference after work executed or canceled.\n\nThe relevant crash call stack as follows:\n list_del corruption. prev-\u003enext should be ffffb638c9c0fe20,\n    but was 0000000000000000\n ------------[ cut here ]------------\n kernel BUG at lib/list_debug.c:51!\n invalid opcode: 0000 [#1] SMP NOPTI\n CPU: 6 PID: 978112 Comm: kworker/6:119 Kdump: loaded Tainted: G #1\n Hardware name: Alibaba Cloud Alibaba Cloud ECS, BIOS 2221b89 04/01/2014\n Workqueue: events smc_link_down_work [smc]\n RIP: 0010:__list_del_entry_valid.cold+0x31/0x47\n RSP: 0018:ffffb638c9c0fdd8 EFLAGS: 00010086\n RAX: 0000000000000054 RBX: ffff942fb75e5128 RCX: 0000000000000000\n RDX: ffff943520930aa0 RSI: ffff94352091fc80 RDI: ffff94352091fc80\n RBP: 0000000000000000 R08: 0000000000000000 R09: ffffb638c9c0fc38\n R10: ffffb638c9c0fc30 R11: ffffffffa015eb28 R12: 0000000000000002\n R13: ffffb638c9c0fe20 R14: 0000000000000001 R15: ffff942f9cd051c0\n FS:  0000000000000000(0000) GS:ffff943520900000(0000) knlGS:0000000000000000\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 00007f4f25214000 CR3: 000000025fbae004 CR4: 00000000007706e0\n DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n PKRU: 55555554\n Call Trace:\n  rwsem_down_write_slowpath+0x17e/0x470\n  smc_link_down_work+0x3c/0x60 [smc]\n  process_one_work+0x1ac/0x350\n  worker_thread+0x49/0x2f0\n  ? rescuer_thread+0x360/0x360\n  kthread+0x118/0x140\n  ? __kthread_bind_mask+0x60/0x60\n  ret_from_fork+0x1f/0x30"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - SMC-R link groups are established and torn down entirely by a remote peer over TCP+RoCE, and both the link-down trigger (TEST LINK timeout / peer QP teardown causing RDMA WC errors) and the lgr free (peer-sent LLC DELETE LINK) are driven by remote protocol messages. No local access is needed to reach `smc_link_down_work()`.\nAC:L - The attacker controls both sides of the race: it arms `link_down_wrk` by ceasing TEST LINK responses or forcing RDMA completion errors, then frees the lgr on demand by sending LLC DELETE LINK, and can retry across many connections. The bug reproduces in ordinary production traffic, so no attacker-uncontrollable precondition is required.\nPR:N - SMC performs no peer authentication \u2014 any host that can complete the TCP/CLC handshake with an SMC listener joins the link group, and `__smc_create()` has no capability check for local use either. The entire LLC link-management path is pre-authentication.\nUI:N - The attack only requires connecting to an already-listening SMC socket and driving normal link teardown; no action by any local user or administrator is involved.\nS:U - The use-after-free corrupts kernel heap memory within the same kernel security authority, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The freed `smc_link_group` is read after free (`list_empty(\u0026lgr-\u003elist)`, `lgr-\u003ellc_msg_waiter`, `lgr-\u003ellc_conf_mutex`) and the freed slab can be reclaimed with attacker-controlled data, and the cascading `smcr_link_down()`/`smc_switch_conns()` paths dereference stale pointers \u2014 yielding an arbitrary-read primitive.\nI:H - `rwsem_down_write_slowpath()` performs `list_add_tail()` into the freed rwsem wait list (the reported list corruption), and `wake_up_all()` traverses a freed waitqueue invoking `curr-\u003efunc()`, giving both a write-what-where and an indirect-call primitive suitable for control-flow hijack.\nA:H - The reported failure is an immediate `kernel BUG at lib/list_debug.c:51` / invalid opcode panic in `smc_link_down_work`, and the attacker can trigger it repeatedly for a reliable remote kernel crash."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:46:16.011Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/bec2f52866d511e94c1c37cd962e4382b1b1a299"
        },
        {
          "url": "https://git.kernel.org/stable/c/2627c3e8646932dfc7b9722c88c2e1ffcf7a9fb2"
        },
        {
          "url": "https://git.kernel.org/stable/c/841b1824750d3b8d1dc0a96b14db4418b952abbc"
        },
        {
          "url": "https://git.kernel.org/stable/c/2b33eb8f1b3e8c2f87cfdbc8cc117f6bdfabc6ec"
        }
      ],
      "title": "net/smc: protect link down work from execute after lgr freed",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-56718",
    "datePublished": "2024-12-29T08:48:50.740Z",
    "dateReserved": "2024-12-27T15:00:39.858Z",
    "dateUpdated": "2026-08-05T11:46:16.011Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2024-56718",
      "date": "2026-11-01",
      "epss": "0.00466",
      "percentile": "0.4035"
    },
    "microsoft_vex": {
      "current_release_date": "2026-03-31T15:12:15.000Z",
      "cve": "CVE-2024-56718",
      "id": "msrc_CVE-2024-56718",
      "initial_release_date": "2024-12-02T00:00:00.000Z",
      "product_status:fixed": "2",
      "product_status:known_affected": "2",
      "product_status:under_investigation": "3",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "net/smc: protect link down work from execute after lgr freed",
      "url": "https://msrc.microsoft.com/csaf/vex/2024/msrc_cve-2024-56718.json",
      "version": "3"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "net/smc/smc_core.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "bec2f52866d511e94c1c37cd962e4382b1b1a299",
                    "status": "affected",
                    "version": "541afa10c126b6c22c2a805a559c70cc41fd156e",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "2627c3e8646932dfc7b9722c88c2e1ffcf7a9fb2",
                    "status": "affected",
                    "version": "541afa10c126b6c22c2a805a559c70cc41fd156e",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "841b1824750d3b8d1dc0a96b14db4418b952abbc",
                    "status": "affected",
                    "version": "541afa10c126b6c22c2a805a559c70cc41fd156e",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "2b33eb8f1b3e8c2f87cfdbc8cc117f6bdfabc6ec",
                    "status": "affected",
                    "version": "541afa10c126b6c22c2a805a559c70cc41fd156e",
                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "net/smc/smc_core.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "5.8"
                  },
                  {
                    "lessThan": "5.8",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.1.*",
                    "status": "unaffected",
                    "version": "6.1.122",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.6.*",
                    "status": "unaffected",
                    "version": "6.6.68",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.12.*",
                    "status": "unaffected",
                    "version": "6.12.7",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "6.13",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "configurations": [
          {
            "nodes": [
              {
                "cpeMatch": [
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "0B8A4CE0-486C-4CC3-91F6-B23D8541F6D0",
                    "versionEndExcluding": "6.1.122",
                    "versionStartIncluding": "5.8",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "74BA9823-CCED-4B24-815D-B82543954BF8",
                    "versionEndExcluding": "6.6.68",
                    "versionStartIncluding": "6.2",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                    "matchCriteriaId": "811AC89A-14AC-49FA-9B54-E99526F1CA47",
                    "versionEndExcluding": "6.12.7",
                    "versionStartIncluding": "6.7",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:*",
                    "matchCriteriaId": "62567B3C-6CEE-46D0-BC2E-B3717FBF7D13",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:*",
                    "matchCriteriaId": "5A073481-106D-4B15-B4C7-FB0213B8E1D4",
                    "vulnerable": true
                  },
                  {
                    "criteria": "cpe:2.3:o:linux:linux_kernel:6.13:rc3:*:*:*:*:*:*",
                    "matchCriteriaId": "DE491969-75AE-4A6B-9A58-8FC5AF98798F",
                    "vulnerable": true
                  }
                ],
                "negate": false,
                "operator": "OR"
              }
            ]
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: protect link down work from execute after lgr freed\n\nlink down work may be scheduled before lgr freed but execute\nafter lgr freed, which may result in crash. So it is need to\nhold a reference before shedule link down work, and put the\nreference after work executed or canceled.\n\nThe relevant crash call stack as follows:\n list_del corruption. prev-\u003enext should be ffffb638c9c0fe20,\n    but was 0000000000000000\n ------------[ cut here ]------------\n kernel BUG at lib/list_debug.c:51!\n invalid opcode: 0000 [#1] SMP NOPTI\n CPU: 6 PID: 978112 Comm: kworker/6:119 Kdump: loaded Tainted: G #1\n Hardware name: Alibaba Cloud Alibaba Cloud ECS, BIOS 2221b89 04/01/2014\n Workqueue: events smc_link_down_work [smc]\n RIP: 0010:__list_del_entry_valid.cold+0x31/0x47\n RSP: 0018:ffffb638c9c0fdd8 EFLAGS: 00010086\n RAX: 0000000000000054 RBX: ffff942fb75e5128 RCX: 0000000000000000\n RDX: ffff943520930aa0 RSI: ffff94352091fc80 RDI: ffff94352091fc80\n RBP: 0000000000000000 R08: 0000000000000000 R09: ffffb638c9c0fc38\n R10: ffffb638c9c0fc30 R11: ffffffffa015eb28 R12: 0000000000000002\n R13: ffffb638c9c0fe20 R14: 0000000000000001 R15: ffff942f9cd051c0\n FS:  0000000000000000(0000) GS:ffff943520900000(0000) knlGS:0000000000000000\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 00007f4f25214000 CR3: 000000025fbae004 CR4: 00000000007706e0\n DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n PKRU: 55555554\n Call Trace:\n  rwsem_down_write_slowpath+0x17e/0x470\n  smc_link_down_work+0x3c/0x60 [smc]\n  process_one_work+0x1ac/0x350\n  worker_thread+0x49/0x2f0\n  ? rescuer_thread+0x360/0x360\n  kthread+0x118/0x140\n  ? __kthread_bind_mask+0x60/0x60\n  ret_from_fork+0x1f/0x30"
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/smc: proteger el trabajo de enlace ca\u00eddo para que no se ejecute despu\u00e9s de que lgr freed el trabajo de enlace ca\u00eddo puede programarse antes de que lgr freed pero ejecutarse despu\u00e9s de que lgr freed, lo que puede provocar un bloqueo. Por lo tanto, es necesario mantener una referencia antes de programar el trabajo de enlace ca\u00eddo y colocar la referencia despu\u00e9s de que el trabajo se haya ejecutado o cancelado. La pila de llamadas de bloqueo relevante es la siguiente: corrupci\u00f3n de list_del. prev-\u0026gt;next deber\u00eda ser ffffb638c9c0fe20, pero era 0000000000000000 ------------[ cortar aqu\u00ed ]------------ \u00a1ERROR del kernel en lib/list_debug.c:51! c\u00f3digo de operaci\u00f3n no v\u00e1lido: 0000 [#1] SMP NOPTI CPU: 6 PID: 978112 Comm: kworker/6:119 Kdump: cargado Contaminado: G #1 Nombre del hardware: Alibaba Cloud Alibaba Cloud ECS, BIOS 2221b89 04/01/2014 Cola de trabajo: eventos smc_link_down_work [smc] RIP: 0010:__list_del_entry_valid.cold+0x31/0x47 RSP: 0018:ffffb638c9c0fdd8 EFLAGS: 00010086 RAX: 0000000000000054 RBX: ffff942fb75e5128 RCX: 000000000000000 RDX: RSI: ffff94352091fc80 RDI: ffff94352091fc80 RBP: 0000000000000000 R08: 0000000000000000 R09: ffffb638c9c0fc38 R10: ffffb638c9c0fc30 R11: ffffffffa015eb28 R12: 0000000000000002 R13: ffffb638c9c0fe20 R14: 0000000000000001 R15: ffff942f9cd051c0 FS: 0000000000000000(0000) GS:ffff943520900000(0000) knlGS:00000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4f25214000 CR3: 000000025fbae004 CR4: 00000000007706e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 00000000000000400 PKRU: 55555554 Seguimiento de llamadas: rwsem_down_write_slowpath+0x17e/0x470 smc_link_down_work+0x3c/0x60 [smc] process_one_work+0x1ac/0x350 subproceso de trabajo+0x49/0x2f0 ? subproceso de rescate+0x360/0x360 kthread+0x118/0x140 ? __kthread_bind_mask+0x60/0x60 ret_from_fork+0x1f/0x30"
          }
        ],
        "id": "CVE-2024-56718",
        "lastModified": "2026-08-04T11:22:24.247",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 9.8,
                "baseSeverity": "CRITICAL",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            },
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            },
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2024-56718",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "no"
                  },
                  {
                    "technicalImpact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2025-10-01T19:58:28.250334Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2024-12-29T09:15:07.040",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/2627c3e8646932dfc7b9722c88c2e1ffcf7a9fb2"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/2b33eb8f1b3e8c2f87cfdbc8cc117f6bdfabc6ec"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/841b1824750d3b8d1dc0a96b14db4418b952abbc"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/bec2f52866d511e94c1c37cd962e4382b1b1a299"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "NVD-CWE-noinfo"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-29T06:53:53+00:00",
      "cve": "CVE-2024-56718",
      "id": "CVE-2024-56718",
      "initial_release_date": "2024-12-29T00:00:00+00:00",
      "product_status:known_affected": "155",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/smc: protect link down work from execute after lgr freed",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-56718.json",
      "version": "3"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "providerMetadata": {
              "dateUpdated": "2025-11-03T20:53:09.586Z",
              "orgId": "af854a3a-2127-422b-91ae-364da2661108",
              "shortName": "CVE"
            },
            "references": [
              {
                "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"
              }
            ],
            "title": "CVE Program Container"
          },
          {
            "metrics": [
              {
                "cvssV3_1": {
                  "attackComplexity": "LOW",
                  "attackVector": "LOCAL",
                  "availabilityImpact": "HIGH",
                  "baseScore": 5.5,
                  "baseSeverity": "MEDIUM",
                  "confidentialityImpact": "NONE",
                  "integrityImpact": "NONE",
                  "privilegesRequired": "LOW",
                  "scope": "UNCHANGED",
                  "userInteraction": "NONE",
                  "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                  "version": "3.1"
                }
              },
              {
                "other": {
                  "content": {
                    "id": "CVE-2024-56718",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "no"
                      },
                      {
                        "Technical Impact": "partial"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2025-10-01T19:58:28.250334Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "problemTypes": [
              {
                "descriptions": [
                  {
                    "description": "CWE-noinfo Not enough information",
                    "lang": "en",
                    "type": "CWE"
                  }
                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2025-10-01T15:47:57.787Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "net/smc/smc_core.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "bec2f52866d511e94c1c37cd962e4382b1b1a299",
                  "status": "affected",
                  "version": "541afa10c126b6c22c2a805a559c70cc41fd156e",
                  "versionType": "git"
                },
                {
                  "lessThan": "2627c3e8646932dfc7b9722c88c2e1ffcf7a9fb2",
                  "status": "affected",
                  "version": "541afa10c126b6c22c2a805a559c70cc41fd156e",
                  "versionType": "git"
                },
                {
                  "lessThan": "841b1824750d3b8d1dc0a96b14db4418b952abbc",
                  "status": "affected",
                  "version": "541afa10c126b6c22c2a805a559c70cc41fd156e",
                  "versionType": "git"
                },
                {
                  "lessThan": "2b33eb8f1b3e8c2f87cfdbc8cc117f6bdfabc6ec",
                  "status": "affected",
                  "version": "541afa10c126b6c22c2a805a559c70cc41fd156e",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "net/smc/smc_core.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "5.8"
                },
                {
                  "lessThan": "5.8",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.1.*",
                  "status": "unaffected",
                  "version": "6.1.122",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.6.*",
                  "status": "unaffected",
                  "version": "6.6.68",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.12.*",
                  "status": "unaffected",
                  "version": "6.12.7",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.13",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1.122",
                      "versionStartIncluding": "5.8",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.6.68",
                      "versionStartIncluding": "5.8",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.12.7",
                      "versionStartIncluding": "5.8",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.13",
                      "versionStartIncluding": "5.8",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: protect link down work from execute after lgr freed\n\nlink down work may be scheduled before lgr freed but execute\nafter lgr freed, which may result in crash. So it is need to\nhold a reference before shedule link down work, and put the\nreference after work executed or canceled.\n\nThe relevant crash call stack as follows:\n list_del corruption. prev-\u003enext should be ffffb638c9c0fe20,\n    but was 0000000000000000\n ------------[ cut here ]------------\n kernel BUG at lib/list_debug.c:51!\n invalid opcode: 0000 [#1] SMP NOPTI\n CPU: 6 PID: 978112 Comm: kworker/6:119 Kdump: loaded Tainted: G #1\n Hardware name: Alibaba Cloud Alibaba Cloud ECS, BIOS 2221b89 04/01/2014\n Workqueue: events smc_link_down_work [smc]\n RIP: 0010:__list_del_entry_valid.cold+0x31/0x47\n RSP: 0018:ffffb638c9c0fdd8 EFLAGS: 00010086\n RAX: 0000000000000054 RBX: ffff942fb75e5128 RCX: 0000000000000000\n RDX: ffff943520930aa0 RSI: ffff94352091fc80 RDI: ffff94352091fc80\n RBP: 0000000000000000 R08: 0000000000000000 R09: ffffb638c9c0fc38\n R10: ffffb638c9c0fc30 R11: ffffffffa015eb28 R12: 0000000000000002\n R13: ffffb638c9c0fe20 R14: 0000000000000001 R15: ffff942f9cd051c0\n FS:  0000000000000000(0000) GS:ffff943520900000(0000) knlGS:0000000000000000\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 00007f4f25214000 CR3: 000000025fbae004 CR4: 00000000007706e0\n DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n PKRU: 55555554\n Call Trace:\n  rwsem_down_write_slowpath+0x17e/0x470\n  smc_link_down_work+0x3c/0x60 [smc]\n  process_one_work+0x1ac/0x350\n  worker_thread+0x49/0x2f0\n  ? rescuer_thread+0x360/0x360\n  kthread+0x118/0x140\n  ? __kthread_bind_mask+0x60/0x60\n  ret_from_fork+0x1f/0x30"
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 9.8,
                "baseSeverity": "CRITICAL",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:N - SMC-R link groups are established and torn down entirely by a remote peer over TCP+RoCE, and both the link-down trigger (TEST LINK timeout / peer QP teardown causing RDMA WC errors) and the lgr free (peer-sent LLC DELETE LINK) are driven by remote protocol messages. No local access is needed to reach `smc_link_down_work()`.\nAC:L - The attacker controls both sides of the race: it arms `link_down_wrk` by ceasing TEST LINK responses or forcing RDMA completion errors, then frees the lgr on demand by sending LLC DELETE LINK, and can retry across many connections. The bug reproduces in ordinary production traffic, so no attacker-uncontrollable precondition is required.\nPR:N - SMC performs no peer authentication \u2014 any host that can complete the TCP/CLC handshake with an SMC listener joins the link group, and `__smc_create()` has no capability check for local use either. The entire LLC link-management path is pre-authentication.\nUI:N - The attack only requires connecting to an already-listening SMC socket and driving normal link teardown; no action by any local user or administrator is involved.\nS:U - The use-after-free corrupts kernel heap memory within the same kernel security authority, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The freed `smc_link_group` is read after free (`list_empty(\u0026lgr-\u003elist)`, `lgr-\u003ellc_msg_waiter`, `lgr-\u003ellc_conf_mutex`) and the freed slab can be reclaimed with attacker-controlled data, and the cascading `smcr_link_down()`/`smc_switch_conns()` paths dereference stale pointers \u2014 yielding an arbitrary-read primitive.\nI:H - `rwsem_down_write_slowpath()` performs `list_add_tail()` into the freed rwsem wait list (the reported list corruption), and `wake_up_all()` traverses a freed waitqueue invoking `curr-\u003efunc()`, giving both a write-what-where and an indirect-call primitive suitable for control-flow hijack.\nA:H - The reported failure is an immediate `kernel BUG at lib/list_debug.c:51` / invalid opcode panic in `smc_link_down_work`, and the attacker can trigger it repeatedly for a reliable remote kernel crash."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T11:46:16.011Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/bec2f52866d511e94c1c37cd962e4382b1b1a299"
            },
            {
              "url": "https://git.kernel.org/stable/c/2627c3e8646932dfc7b9722c88c2e1ffcf7a9fb2"
            },
            {
              "url": "https://git.kernel.org/stable/c/841b1824750d3b8d1dc0a96b14db4418b952abbc"
            },
            {
              "url": "https://git.kernel.org/stable/c/2b33eb8f1b3e8c2f87cfdbc8cc117f6bdfabc6ec"
            }
          ],
          "title": "net/smc: protect link down work from execute after lgr freed",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2024-56718",
        "datePublished": "2024-12-29T08:48:50.740Z",
        "dateReserved": "2024-12-27T15:00:39.858Z",
        "dateUpdated": "2026-08-05T11:46:16.011Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON

Loading timeline…




    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.