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rxrpc: serialize kernel accept preallocation with socket teardown

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: rxrpc: serialize kernel accept preallocation with socket teardown rxrpc_kernel_charge_accept() reads rx->backlog without any socket/backlog synchronization and passes that raw pointer into rxrpc_service_prealloc_one(). A concurrent rxrpc_discard_prealloc() sets rx->backlog = NULL and frees the backlog rings, so a kernel preallocation worker can keep using a freed struct rxrpc_backlog while updating *_backlog_head/tail and array slots. Serialize the state check and backlog lookup with the socket lock, and reject kernel preallocation once teardown has disabled listening or discarded the service backlog.

Announced Source revision 1
Original source ↗

CVE-2026-74436

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-74436

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "00e907127e6f86d0f9b122d9b4347a8aa09a8b61",
        "lessThan": "d6207326b4ca0ae1041281b6af9df53f8080669a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "00e907127e6f86d0f9b122d9b4347a8aa09a8b61",
        "lessThan": "11b429b84c87cb5a0152f14e7d6cb649ed363901",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "00e907127e6f86d0f9b122d9b4347a8aa09a8b61",
        "lessThan": "c20d983968f239574290cf804a58cde18ad1c559",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "00e907127e6f86d0f9b122d9b4347a8aa09a8b61",
        "lessThan": "0337cdba0c477f176c0459bed012109453184573",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "00e907127e6f86d0f9b122d9b4347a8aa09a8b61",
        "lessThan": "dfa0b2bbc5e50119f89c6b5407faa5ed86dfa7c5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "00e907127e6f86d0f9b122d9b4347a8aa09a8b61",
        "lessThan": "35a967ff8b24db09ee429c39c5b5e6571639997d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "00e907127e6f86d0f9b122d9b4347a8aa09a8b61",
        "lessThan": "1741378a7a83dfd8e53a9196730df709b903cd33",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "00e907127e6f86d0f9b122d9b4347a8aa09a8b61",
        "lessThan": "dc175389b18c29a5303ee83169ec653adfae3e17",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/rxrpc/call_accept.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.9"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.9",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.266",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.217",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.184",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.148",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.101",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.40",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.5",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/rxrpc/call_accept.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-74436

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#33150 · Revision 1
Added to Heist Feed
Publisher date
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