Vulnerability-Lookup

GHSA-7W6X-PFMG-76XX

Vulnerability from github – Published: 2026-04-23 12:31 – Updated: 2026-04-23 12:31

Details

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]

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{
  "affected": [],
  "aliases": [
    "CVE-2026-31532"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-23T12:17:01Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: raw: fix ro-\u003euniq use-after-free in raw_rcv()\n\nraw_release() unregisters raw CAN receive filters via can_rx_unregister(),\nbut receiver deletion is deferred with call_rcu(). This leaves a window\nwhere raw_rcv() may still be running in an RCU read-side critical section\nafter raw_release() frees ro-\u003euniq, leading to a use-after-free of the\npercpu uniq storage.\n\nMove free_percpu(ro-\u003euniq) out of raw_release() and into a raw-specific\nsocket destructor. can_rx_unregister() takes an extra reference to the\nsocket and only drops it from the RCU callback, so freeing uniq from\nsk_destruct ensures the percpu area is not released until the relevant\ncallbacks have drained.\n\n[mkl: applied manually]",
  "id": "GHSA-7w6x-pfmg-76xx",
  "modified": "2026-04-23T12:31:35Z",
  "published": "2026-04-23T12:31:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31532"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1a0f2de81f7fbdc538fc72d7d74609b79bc83cc0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/34c1741254ff972e8375faf176678a248826fe3a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/572f0bf536ebc14f6e7da3d21a85cf076de8358e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7201a531b9a5ed892bfda5ded9194ef622de8ffa"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-31532 (GCVE-0-2026-31532)

Vulnerability from cvelistv5 – Published: 2026-04-23 11:12 – Updated: 2026-04-23 11:12

Title

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

Summary

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]

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/572f0bf536ebc14f6…
	https://git.kernel.org/stable/c/1a0f2de81f7fbdc53…
	https://git.kernel.org/stable/c/7201a531b9a5ed892…
	https://git.kernel.org/stable/c/34c1741254ff972e8…

Impacted products

Vendor

Product

Version

Linux

Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 572f0bf536ebc14f6e7da3d21a85cf076de8358e (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 1a0f2de81f7fbdc538fc72d7d74609b79bc83cc0 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 7201a531b9a5ed892bfda5ded9194ef622de8ffa (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 34c1741254ff972e8375faf176678a248826fe3a (git)

Linux

Unaffected: 6.12.83 , ≤ 6.12.* (semver)
Unaffected: 6.18.24 , ≤ 6.18.* (semver)
Unaffected: 6.19.14 , ≤ 6.19.* (semver)
Unaffected: 7.0.1 , ≤ 7.0.* (semver)

Show details on NVD website

JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/can/raw.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "572f0bf536ebc14f6e7da3d21a85cf076de8358e",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "1a0f2de81f7fbdc538fc72d7d74609b79bc83cc0",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "7201a531b9a5ed892bfda5ded9194ef622de8ffa",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            },
            {
              "lessThan": "34c1741254ff972e8375faf176678a248826fe3a",
              "status": "affected",
              "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/can/raw.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.83",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.24",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.1",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.83",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.24",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.1",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: raw: fix ro-\u003euniq use-after-free in raw_rcv()\n\nraw_release() unregisters raw CAN receive filters via can_rx_unregister(),\nbut receiver deletion is deferred with call_rcu(). This leaves a window\nwhere raw_rcv() may still be running in an RCU read-side critical section\nafter raw_release() frees ro-\u003euniq, leading to a use-after-free of the\npercpu uniq storage.\n\nMove free_percpu(ro-\u003euniq) out of raw_release() and into a raw-specific\nsocket destructor. can_rx_unregister() takes an extra reference to the\nsocket and only drops it from the RCU callback, so freeing uniq from\nsk_destruct ensures the percpu area is not released until the relevant\ncallbacks have drained.\n\n[mkl: applied manually]"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-23T11:12:44.829Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/572f0bf536ebc14f6e7da3d21a85cf076de8358e"
        },
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          "url": "https://git.kernel.org/stable/c/1a0f2de81f7fbdc538fc72d7d74609b79bc83cc0"
        },
        {
          "url": "https://git.kernel.org/stable/c/7201a531b9a5ed892bfda5ded9194ef622de8ffa"
        },
        {
          "url": "https://git.kernel.org/stable/c/34c1741254ff972e8375faf176678a248826fe3a"
        }
      ],
      "title": "can: raw: fix ro-\u003euniq use-after-free in raw_rcv()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31532",
    "datePublished": "2026-04-23T11:12:44.829Z",
    "dateReserved": "2026-03-09T15:48:24.112Z",
    "dateUpdated": "2026-04-23T11:12:44.829Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date

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.

Action not permitted

GHSA-7W6X-PFMG-76XX

CVE-2026-31532 (GCVE-0-2026-31532)

Tags

Sightings

Nomenclature