Vulnerability-Lookup

GHSA-3C6V-88WH-34PH

Vulnerability from github – Published: 2026-01-23 18:31 – Updated: 2026-01-23 18:31

Details

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

net: do not write to msg_get_inq in callee

NULL pointer dereference fix.

msg_get_inq is an input field from caller to callee. Don't set it in the callee, as the caller may not clear it on struct reuse.

This is a kernel-internal variant of msghdr only, and the only user does reinitialize the field. So this is not critical for that reason. But it is more robust to avoid the write, and slightly simpler code. And it fixes a bug, see below.

Callers set msg_get_inq to request the input queue length to be returned in msg_inq. This is equivalent to but independent from the SO_INQ request to return that same info as a cmsg (tp->recvmsg_inq). To reduce branching in the hot path the second also sets the msg_inq. That is WAI.

This is a fix to commit 4d1442979e4a ("af_unix: don't post cmsg for SO_INQ unless explicitly asked for"), which fixed the inverse.

Also avoid NULL pointer dereference in unix_stream_read_generic if state->msg is NULL and msg->msg_get_inq is written. A NULL state->msg can happen when splicing as of commit 2b514574f7e8 ("net: af_unix: implement splice for stream af_unix sockets").

Also collapse two branches using a bitwise or.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-22983"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-01-23T16:15:54Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: do not write to msg_get_inq in callee\n\nNULL pointer dereference fix.\n\nmsg_get_inq is an input field from caller to callee. Don\u0027t set it in\nthe callee, as the caller may not clear it on struct reuse.\n\nThis is a kernel-internal variant of msghdr only, and the only user\ndoes reinitialize the field. So this is not critical for that reason.\nBut it is more robust to avoid the write, and slightly simpler code.\nAnd it fixes a bug, see below.\n\nCallers set msg_get_inq to request the input queue length to be\nreturned in msg_inq. This is equivalent to but independent from the\nSO_INQ request to return that same info as a cmsg (tp-\u003erecvmsg_inq).\nTo reduce branching in the hot path the second also sets the msg_inq.\nThat is WAI.\n\nThis is a fix to commit 4d1442979e4a (\"af_unix: don\u0027t post cmsg for\nSO_INQ unless explicitly asked for\"), which fixed the inverse.\n\nAlso avoid NULL pointer dereference in unix_stream_read_generic if\nstate-\u003emsg is NULL and msg-\u003emsg_get_inq is written. A NULL state-\u003emsg\ncan happen when splicing as of commit 2b514574f7e8 (\"net: af_unix:\nimplement splice for stream af_unix sockets\").\n\nAlso collapse two branches using a bitwise or.",
  "id": "GHSA-3c6v-88wh-34ph",
  "modified": "2026-01-23T18:31:28Z",
  "published": "2026-01-23T18:31:28Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-22983"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7d11e047eda5f98514ae62507065ac961981c025"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ffa2be496ef65055b28b39c6bd9a7d66943ee89a"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-22983 (GCVE-0-2026-22983)

Vulnerability from cvelistv5 – Published: 2026-01-23 15:24 – Updated: 2026-01-23 15:24

Title

net: do not write to msg_get_inq in callee

Summary

In the Linux kernel, the following vulnerability has been resolved: net: do not write to msg_get_inq in callee NULL pointer dereference fix. msg_get_inq is an input field from caller to callee. Don't set it in the callee, as the caller may not clear it on struct reuse. This is a kernel-internal variant of msghdr only, and the only user does reinitialize the field. So this is not critical for that reason. But it is more robust to avoid the write, and slightly simpler code. And it fixes a bug, see below. Callers set msg_get_inq to request the input queue length to be returned in msg_inq. This is equivalent to but independent from the SO_INQ request to return that same info as a cmsg (tp->recvmsg_inq). To reduce branching in the hot path the second also sets the msg_inq. That is WAI. This is a fix to commit 4d1442979e4a ("af_unix: don't post cmsg for SO_INQ unless explicitly asked for"), which fixed the inverse. Also avoid NULL pointer dereference in unix_stream_read_generic if state->msg is NULL and msg->msg_get_inq is written. A NULL state->msg can happen when splicing as of commit 2b514574f7e8 ("net: af_unix: implement splice for stream af_unix sockets"). Also collapse two branches using a bitwise or.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/ffa2be496ef65055b…
	https://git.kernel.org/stable/c/7d11e047eda5f9851…

Impacted products

Vendor

Product

Version

Linux

Affected: 089e50f29eeec8eef6ae1450fc88138d719291cb , < ffa2be496ef65055b28b39c6bd9a7d66943ee89a (git)
Affected: 4d1442979e4a53b9457ce1e373e187e1511ff688 , < 7d11e047eda5f98514ae62507065ac961981c025 (git)

Linux

Affected: 6.19-rc4
Unaffected: 0 , < 6.19-rc4 (semver)
Unaffected: 6.18.6 , ≤ 6.18.* (semver)
Unaffected: 6.19-rc5 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/tcp.c",
            "net/unix/af_unix.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ffa2be496ef65055b28b39c6bd9a7d66943ee89a",
              "status": "affected",
              "version": "089e50f29eeec8eef6ae1450fc88138d719291cb",
              "versionType": "git"
            },
            {
              "lessThan": "7d11e047eda5f98514ae62507065ac961981c025",
              "status": "affected",
              "version": "4d1442979e4a53b9457ce1e373e187e1511ff688",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/tcp.c",
            "net/unix/af_unix.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.19-rc4"
            },
            {
              "lessThan": "6.19-rc4",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.19-rc5",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.6",
                  "versionStartIncluding": "6.18.4",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19-rc5",
                  "versionStartIncluding": "6.19-rc4",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: do not write to msg_get_inq in callee\n\nNULL pointer dereference fix.\n\nmsg_get_inq is an input field from caller to callee. Don\u0027t set it in\nthe callee, as the caller may not clear it on struct reuse.\n\nThis is a kernel-internal variant of msghdr only, and the only user\ndoes reinitialize the field. So this is not critical for that reason.\nBut it is more robust to avoid the write, and slightly simpler code.\nAnd it fixes a bug, see below.\n\nCallers set msg_get_inq to request the input queue length to be\nreturned in msg_inq. This is equivalent to but independent from the\nSO_INQ request to return that same info as a cmsg (tp-\u003erecvmsg_inq).\nTo reduce branching in the hot path the second also sets the msg_inq.\nThat is WAI.\n\nThis is a fix to commit 4d1442979e4a (\"af_unix: don\u0027t post cmsg for\nSO_INQ unless explicitly asked for\"), which fixed the inverse.\n\nAlso avoid NULL pointer dereference in unix_stream_read_generic if\nstate-\u003emsg is NULL and msg-\u003emsg_get_inq is written. A NULL state-\u003emsg\ncan happen when splicing as of commit 2b514574f7e8 (\"net: af_unix:\nimplement splice for stream af_unix sockets\").\n\nAlso collapse two branches using a bitwise or."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-01-23T15:24:05.394Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ffa2be496ef65055b28b39c6bd9a7d66943ee89a"
        },
        {
          "url": "https://git.kernel.org/stable/c/7d11e047eda5f98514ae62507065ac961981c025"
        }
      ],
      "title": "net: do not write to msg_get_inq in callee",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-22983",
    "datePublished": "2026-01-23T15:24:05.394Z",
    "dateReserved": "2026-01-13T15:37:45.936Z",
    "dateUpdated": "2026-01-23T15:24:05.394Z",
    "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-3C6V-88WH-34PH

CVE-2026-22983 (GCVE-0-2026-22983)

Tags

Sightings

Nomenclature