Vulnerability-Lookup

GHSA-J385-2PPR-7766

Vulnerability from github – Published: 2024-06-20 12:31 – Updated: 2025-01-07 00:31

Details

In the Linux kernel, the following vulnerability has been resolved:

net/smc: Transitional solution for clcsock race issue

We encountered a crash in smc_setsockopt() and it is caused by accessing smc->clcsock after clcsock was released.

BUG: kernel NULL pointer dereference, address: 0000000000000020 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP PTI CPU: 1 PID: 50309 Comm: nginx Kdump: loaded Tainted: G E 5.16.0-rc4+ #53 RIP: 0010:smc_setsockopt+0x59/0x280 [smc] Call Trace: __sys_setsockopt+0xfc/0x190 __x64_sys_setsockopt+0x20/0x30 do_syscall_64+0x34/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f16ba83918e

This patch tries to fix it by holding clcsock_release_lock and checking whether clcsock has already been released before access.

In case that a crash of the same reason happens in smc_getsockopt() or smc_switch_to_fallback(), this patch also checkes smc->clcsock in them too. And the caller of smc_switch_to_fallback() will identify whether fallback succeeds according to the return value.

Severity

4.7 (Medium)


                  
                    CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2022-48751"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-06-20T12:15:13Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: Transitional solution for clcsock race issue\n\nWe encountered a crash in smc_setsockopt() and it is caused by\naccessing smc-\u003eclcsock after clcsock was released.\n\n BUG: kernel NULL pointer dereference, address: 0000000000000020\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD 0 P4D 0\n Oops: 0000 [#1] PREEMPT SMP PTI\n CPU: 1 PID: 50309 Comm: nginx Kdump: loaded Tainted: G E     5.16.0-rc4+ #53\n RIP: 0010:smc_setsockopt+0x59/0x280 [smc]\n Call Trace:\n  \u003cTASK\u003e\n  __sys_setsockopt+0xfc/0x190\n  __x64_sys_setsockopt+0x20/0x30\n  do_syscall_64+0x34/0x90\n  entry_SYSCALL_64_after_hwframe+0x44/0xae\n RIP: 0033:0x7f16ba83918e\n  \u003c/TASK\u003e\n\nThis patch tries to fix it by holding clcsock_release_lock and\nchecking whether clcsock has already been released before access.\n\nIn case that a crash of the same reason happens in smc_getsockopt()\nor smc_switch_to_fallback(), this patch also checkes smc-\u003eclcsock\nin them too. And the caller of smc_switch_to_fallback() will identify\nwhether fallback succeeds according to the return value.",
  "id": "GHSA-j385-2ppr-7766",
  "modified": "2025-01-07T00:31:39Z",
  "published": "2024-06-20T12:31:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-48751"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/38f0bdd548fd2ef5d481b88d8a2bfef968452e34"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4284225cd8001e134f5cf533a7cd244bbb654d0f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c0bf3d8a943b6f2e912b7c1de03e2ef28e76f760"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2022-48751 (GCVE-0-2022-48751)

Vulnerability from cvelistv5 – Published: 2024-06-20 11:13 – Updated: 2026-08-05 08:52

Title

net/smc: Transitional solution for clcsock race issue

Summary

In the Linux kernel, the following vulnerability has been resolved: net/smc: Transitional solution for clcsock race issue We encountered a crash in smc_setsockopt() and it is caused by accessing smc->clcsock after clcsock was released. BUG: kernel NULL pointer dereference, address: 0000000000000020 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP PTI CPU: 1 PID: 50309 Comm: nginx Kdump: loaded Tainted: G E 5.16.0-rc4+ #53 RIP: 0010:smc_setsockopt+0x59/0x280 [smc] Call Trace: <TASK> __sys_setsockopt+0xfc/0x190 __x64_sys_setsockopt+0x20/0x30 do_syscall_64+0x34/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f16ba83918e </TASK> This patch tries to fix it by holding clcsock_release_lock and checking whether clcsock has already been released before access. In case that a crash of the same reason happens in smc_getsockopt() or smc_switch_to_fallback(), this patch also checkes smc->clcsock in them too. And the caller of smc_switch_to_fallback() will identify whether fallback succeeds according to the return value.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-09-10 17:10 UTC

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/38f0bdd548fd2ef5d…
https://git.kernel.org/stable/c/4284225cd8001e134…
https://git.kernel.org/stable/c/c0bf3d8a943b6f2e9…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9 , < 38f0bdd548fd2ef5d481b88d8a2bfef968452e34 (git) Affected: fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9 , < 4284225cd8001e134f5cf533a7cd244bbb654d0f (git) Affected: fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9 , < c0bf3d8a943b6f2e912b7c1de03e2ef28e76f760 (git) Affected: d1d004585b40c212b338fc8a40cbaaf230ea4703 (git) Affected: 4.19.299 , < 4.20 (semver)
Linux	Linux	Affected: 5.1 Unaffected: 0 , < 5.1 (semver) Unaffected: 5.15.19 , ≤ 5.15.* (semver) Unaffected: 5.16.5 , ≤ 5.16.* (semver) Unaffected: 5.17 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-03T15:25:00.333Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/38f0bdd548fd2ef5d481b88d8a2bfef968452e34"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/4284225cd8001e134f5cf533a7cd244bbb654d0f"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/c0bf3d8a943b6f2e912b7c1de03e2ef28e76f760"
          }
        ],
        "title": "CVE Program Container"
      },
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2022-48751",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-09-10T17:10:28.867754Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-09-11T17:34:47.967Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/smc/af_smc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "38f0bdd548fd2ef5d481b88d8a2bfef968452e34",
              "status": "affected",
              "version": "fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9",
              "versionType": "git"
            },
            {
              "lessThan": "4284225cd8001e134f5cf533a7cd244bbb654d0f",
              "status": "affected",
              "version": "fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9",
              "versionType": "git"
            },
            {
              "lessThan": "c0bf3d8a943b6f2e912b7c1de03e2ef28e76f760",
              "status": "affected",
              "version": "fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "d1d004585b40c212b338fc8a40cbaaf230ea4703",
              "versionType": "git"
            },
            {
              "lessThan": "4.20",
              "status": "affected",
              "version": "4.19.299",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/smc/af_smc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.1"
            },
            {
              "lessThan": "5.1",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.19",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.16.*",
              "status": "unaffected",
              "version": "5.16.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.17",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.19",
                  "versionStartIncluding": "5.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.16.5",
                  "versionStartIncluding": "5.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.17",
                  "versionStartIncluding": "5.1",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "4.19.299",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: Transitional solution for clcsock race issue\n\nWe encountered a crash in smc_setsockopt() and it is caused by\naccessing smc-\u003eclcsock after clcsock was released.\n\n BUG: kernel NULL pointer dereference, address: 0000000000000020\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD 0 P4D 0\n Oops: 0000 [#1] PREEMPT SMP PTI\n CPU: 1 PID: 50309 Comm: nginx Kdump: loaded Tainted: G E     5.16.0-rc4+ #53\n RIP: 0010:smc_setsockopt+0x59/0x280 [smc]\n Call Trace:\n  \u003cTASK\u003e\n  __sys_setsockopt+0xfc/0x190\n  __x64_sys_setsockopt+0x20/0x30\n  do_syscall_64+0x34/0x90\n  entry_SYSCALL_64_after_hwframe+0x44/0xae\n RIP: 0033:0x7f16ba83918e\n  \u003c/TASK\u003e\n\nThis patch tries to fix it by holding clcsock_release_lock and\nchecking whether clcsock has already been released before access.\n\nIn case that a crash of the same reason happens in smc_getsockopt()\nor smc_switch_to_fallback(), this patch also checkes smc-\u003eclcsock\nin them too. And the caller of smc_switch_to_fallback() will identify\nwhether fallback succeeds according to the return value."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is reached via local socket syscalls (setsockopt/getsockopt/fallback) on an AF_SMC socket; a remote peer alone cannot invoke the vulnerable paths without local process participation.\nAC:L - The attacker controls both sides of the race by concurrently calling setsockopt/getsockopt and close (or otherwise triggering smc_clcsock_release) on a shared AF_SMC fd, so success does not depend on conditions outside attacker influence.\nPR:L - Creating and operating AF_SMC sockets requires only an unprivileged local account; smc_create has no capability check, and user namespaces are not required.\nUI:N - Exploitation uses only the attacker\u0027s own syscalls on sockets they create; no separate victim action is required.\nS:U - Impact is confined to the local kernel\u0027s SMC/socket authority; this is standard kernel memory-safety damage, not a cross-boundary escape.\nC:H - The unlocked clcsock access races with smc_clcsock_release()\u0027s sock_release, yielding a use-after-free on the TCP CLC socket object that can be reclaimed and read through.\nI:H - The same UAF is exercised by smc_switch_to_fallback(), which writes clcsock fields and splices wait-queues through the freed pointer, enabling heap corruption and control-flow hijacking primitives.\nA:H - The race reliably produces kernel NULL pointer dereference or UAF oops/panic (as in the reported smc_setsockopt crash), causing full availability loss."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:52:07.796Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/38f0bdd548fd2ef5d481b88d8a2bfef968452e34"
        },
        {
          "url": "https://git.kernel.org/stable/c/4284225cd8001e134f5cf533a7cd244bbb654d0f"
        },
        {
          "url": "https://git.kernel.org/stable/c/c0bf3d8a943b6f2e912b7c1de03e2ef28e76f760"
        }
      ],
      "title": "net/smc: Transitional solution for clcsock race issue",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-48751",
    "datePublished": "2024-06-20T11:13:32.575Z",
    "dateReserved": "2024-06-20T11:09:39.057Z",
    "dateUpdated": "2026-08-05T08:52:07.796Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.

Action not permitted

GHSA-J385-2PPR-7766

CVE-2022-48751 (GCVE-0-2022-48751)

Tags

Sightings

Nomenclature

Related by attack behaviour