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can: raw: fix ro->uniq use-after-free in raw_rcv()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: can: raw: fix ro->uniq use-after-free in raw_rcv() raw_release() unregisters raw CAN receive filters via can_rx_unregister(), but receiver deletion is deferred with call_rcu(). This leaves a window where raw_rcv() may still be running in an RCU read-side critical section after raw_release() frees ro->uniq, leading to a use-after-free of the percpu uniq storage. Move free_percpu(ro->uniq) out of raw_release() and into a raw-specific socket destructor. can_rx_unregister() takes an extra reference to the socket and only drops it from the RCU callback, so freeing uniq from sk_destruct ensures the percpu area is not released until the relevant callbacks have drained. [mkl: applied manually]

Announced Source revision 1
Original source ↗

CVE-2026-31532

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-2026-31532

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": "514ac99c64b22d83b52dfee3b8becaa69a92bc4a",
        "lessThan": "1de30576a6dfeaaa27ef91fa272e6b9240b6fbd3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "514ac99c64b22d83b52dfee3b8becaa69a92bc4a",
        "lessThan": "64c8553decf5a5f2417bd54761ea0a832c56c4ca",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "514ac99c64b22d83b52dfee3b8becaa69a92bc4a",
        "lessThan": "3f43f12fde34737fba091b7e3ab391e14ddbb0be",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "514ac99c64b22d83b52dfee3b8becaa69a92bc4a",
        "lessThan": "5e9cfffad898bbeaafd0ea608a6d267362f050fc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "514ac99c64b22d83b52dfee3b8becaa69a92bc4a",
        "lessThan": "572f0bf536ebc14f6e7da3d21a85cf076de8358e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "514ac99c64b22d83b52dfee3b8becaa69a92bc4a",
        "lessThan": "1a0f2de81f7fbdc538fc72d7d74609b79bc83cc0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "514ac99c64b22d83b52dfee3b8becaa69a92bc4a",
        "lessThan": "7201a531b9a5ed892bfda5ded9194ef622de8ffa",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "514ac99c64b22d83b52dfee3b8becaa69a92bc4a",
        "lessThan": "34c1741254ff972e8375faf176678a248826fe3a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "514ac99c64b22d83b52dfee3b8becaa69a92bc4a",
        "lessThan": "a535a9217ca3f2fccedaafb2fddb4c48f27d36dc",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/can/raw.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.1"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.1",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.258",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.209",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.175",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.136",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.83",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.24",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19.14",
        "versionType": "semver",
        "lessThanOrEqual": "6.19.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.1",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/can/raw.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-31532

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#39918 · Revision 1
Added to Heist Feed
Publisher date
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