CVE-2024-56606 (GCVE-0-2024-56606)

Vulnerability from cvelistv5 – Published: 2024-12-27 14:51 – Updated: 2026-10-15 00:59
VLAI
Title
af_packet: avoid erroring out after sock_init_data() in packet_create()
Summary
In the Linux kernel, the following vulnerability has been resolved: af_packet: avoid erroring out after sock_init_data() in packet_create() After sock_init_data() the allocated sk object is attached to the provided sock object. On error, packet_create() frees the sk object leaving the dangling pointer in the sock object on return. Some other code may try to use this pointer and cause use-after-free.
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: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-02-11 15:42 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: b013840810c221f2b0cf641d01531526052dc1fb , < 71b22837a5e55ac27d6a14b9cdf2326587405c4f (git)
Affected: b013840810c221f2b0cf641d01531526052dc1fb , < 1dc1e1db927056cb323296e2294a855cd003dfe7 (git)
Affected: b013840810c221f2b0cf641d01531526052dc1fb , < 132e615bb1d7cdec2d3cfbdec2efa630e923fd21 (git)
Affected: b013840810c221f2b0cf641d01531526052dc1fb , < a6cf750b737374454a4e03a5ed449a3eb0c96414 (git)
Affected: b013840810c221f2b0cf641d01531526052dc1fb , < 157f08db94123e2ba56877dd0ac88908b13a5dd0 (git)
Affected: b013840810c221f2b0cf641d01531526052dc1fb , < fd09880b16d33aa5a7420578e01cd79148fa9829 (git)
Affected: b013840810c221f2b0cf641d01531526052dc1fb , < 46f2a11cb82b657fd15bab1c47821b635e03838b (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.14
Unaffected: 0 , < 3.14 (semver)
Unaffected: 5.4.287 , ≤ 5.4.* (semver)
Unaffected: 5.10.231 , ≤ 5.10.* (semver)
Unaffected: 5.15.174 , ≤ 5.15.* (semver)
Unaffected: 6.1.120 , ≤ 6.1.* (semver)
Unaffected: 6.6.66 , ≤ 6.6.* (semver)
Unaffected: 6.12.5 , ≤ 6.12.* (semver)
Unaffected: 6.13 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.0 , < V3.1.5 (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.0 , < V3.1.5 (custom)
guessed Create a notification for this product.
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.0 , < V3.1.5 (custom)
guessed Create a notification for this product.
Siemens RUGGEDCOM RST2428P Affected: 0 , < V3.2 (custom)
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Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family Affected: 0 , < V3.2 (custom)
guessed Create a notification for this product.
Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 family Affected: 0 , < V3.2 (custom)
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                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.4.287",
                      "versionStartIncluding": "3.14",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.231",
                      "versionStartIncluding": "3.14",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.174",
                      "versionStartIncluding": "3.14",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1.120",
                      "versionStartIncluding": "3.14",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.6.66",
                      "versionStartIncluding": "3.14",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.12.5",
                      "versionStartIncluding": "3.14",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.13",
                      "versionStartIncluding": "3.14",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\naf_packet: avoid erroring out after sock_init_data() in packet_create()\n\nAfter sock_init_data() the allocated sk object is attached to the provided\nsock object. On error, packet_create() frees the sk object leaving the\ndangling pointer in the sock object on return. Some other code may try\nto use this pointer and cause use-after-free."
            }
          ],
          "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 vulnerability is reached purely through the local `socket(AF_PACKET, ...)` syscall path (`__sys_socket` \u2192 `__sock_create` \u2192 `packet_create`); no network packet or remote peer is involved in triggering it.\nAC:L - The attacker controls both preconditions \u2014 they can exhaust percpu/slab memory themselves (mass socket and BPF-map allocation, netns churn) and retry the cheap `socket()` call in an unbounded loop until `alloc_percpu()` fails, and can heap-spray the generic kmalloc cache to reclaim the freed `packet_sock`.\nPR:L - The only gate is `ns_capable(net-\u003euser_ns, CAP_NET_RAW)` at af_packet.c:3394, which any unprivileged user satisfies inside a user+network namespace (`unshare -Urn`), and which containers hold by default.\nUI:N - The attacker triggers the entire sequence from their own process via repeated `socket()` calls; no action by any other user or administrator is required.\nS:U - The dangling pointer, the freed object, and the resulting corruption are all within the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The use-after-free reads freed slab memory (`atomic64_read(\u0026sk-\u003esk_cookie)` in `__sock_gen_cookie()`), and since `packet_sock` comes from a generic kmalloc cache the attacker can reclaim the object with sprayed content, turning this into a controllable kernel memory disclosure primitive.\nI:H - `__sock_gen_cookie()` performs an `atomic64_cmpxchg()` on the freed object \u2014 an 8-byte write into attacker-reclaimed slab memory at a controlled offset, which is a classic stepping stone to control-flow hijack and privilege escalation.\nA:H - Dereferencing the dangling `sock-\u003esk` after `sk_free()` corrupts freed slab memory and reliably produces a KASAN splat, oops, or panic, as shown in the reference report for this bug class."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T11:45:27.108Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/71b22837a5e55ac27d6a14b9cdf2326587405c4f"
            },
            {
              "url": "https://git.kernel.org/stable/c/1dc1e1db927056cb323296e2294a855cd003dfe7"
            },
            {
              "url": "https://git.kernel.org/stable/c/132e615bb1d7cdec2d3cfbdec2efa630e923fd21"
            },
            {
              "url": "https://git.kernel.org/stable/c/a6cf750b737374454a4e03a5ed449a3eb0c96414"
            },
            {
              "url": "https://git.kernel.org/stable/c/157f08db94123e2ba56877dd0ac88908b13a5dd0"
            },
            {
              "url": "https://git.kernel.org/stable/c/fd09880b16d33aa5a7420578e01cd79148fa9829"
            },
            {
              "url": "https://git.kernel.org/stable/c/46f2a11cb82b657fd15bab1c47821b635e03838b"
            }
          ],
          "title": "af_packet: avoid erroring out after sock_init_data() in packet_create()",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2024-56606",
        "datePublished": "2024-12-27T14:51:11.327Z",
        "dateReserved": "2024-12-27T14:03:06.013Z",
        "dateUpdated": "2026-10-15T00:59:48.866Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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