Vulnerability-Lookup

GHSA-39XQ-39V8-2G6G

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/sched: act_api: avoid dereferencing ERR_PTR in tcf_idrinfo_destroy

syzbot reported a crash in tc_act_in_hw() during netns teardown where tcf_idrinfo_destroy() passed an ERR_PTR(-EBUSY) value as a tc_action pointer, leading to an invalid dereference.

Guard against ERR_PTR entries when iterating the action IDR so teardown does not call tc_act_in_hw() on an error pointer.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-22987"
  ],
  "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/sched: act_api: avoid dereferencing ERR_PTR in tcf_idrinfo_destroy\n\nsyzbot reported a crash in tc_act_in_hw() during netns teardown where\ntcf_idrinfo_destroy() passed an ERR_PTR(-EBUSY) value as a tc_action\npointer, leading to an invalid dereference.\n\nGuard against ERR_PTR entries when iterating the action IDR so teardown\ndoes not call tc_act_in_hw() on an error pointer.",
  "id": "GHSA-39xq-39v8-2g6g",
  "modified": "2026-01-23T18:31:29Z",
  "published": "2026-01-23T18:31:29Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-22987"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/67550a1130b647bb0d093c9c0a810c69aa6a30a8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/adb25a46dc0a43173f5ea5f5f58fc8ba28970c7c"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-22987 (GCVE-0-2026-22987)

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

Title

net/sched: act_api: avoid dereferencing ERR_PTR in tcf_idrinfo_destroy

Summary

In the Linux kernel, the following vulnerability has been resolved: net/sched: act_api: avoid dereferencing ERR_PTR in tcf_idrinfo_destroy syzbot reported a crash in tc_act_in_hw() during netns teardown where tcf_idrinfo_destroy() passed an ERR_PTR(-EBUSY) value as a tc_action pointer, leading to an invalid dereference. Guard against ERR_PTR entries when iterating the action IDR so teardown does not call tc_act_in_hw() on an error pointer.

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/67550a1130b647bb0…
	https://git.kernel.org/stable/c/adb25a46dc0a43173…

Impacted products

Vendor

Product

Version

Linux

Affected: 84a7d6797e6a03705e6b48c613fa424662049d87 , < 67550a1130b647bb0d093c9c0a810c69aa6a30a8 (git)
Affected: 84a7d6797e6a03705e6b48c613fa424662049d87 , < adb25a46dc0a43173f5ea5f5f58fc8ba28970c7c (git)

Linux

Affected: 6.17
Unaffected: 0 , < 6.17 (semver)
Unaffected: 6.18.6 , ≤ 6.18.* (semver)
Unaffected: 6.19-rc5 , ≤ * (original_commit_for_fix)

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JSON

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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sched/act_api.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "67550a1130b647bb0d093c9c0a810c69aa6a30a8",
              "status": "affected",
              "version": "84a7d6797e6a03705e6b48c613fa424662049d87",
              "versionType": "git"
            },
            {
              "lessThan": "adb25a46dc0a43173f5ea5f5f58fc8ba28970c7c",
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              "version": "84a7d6797e6a03705e6b48c613fa424662049d87",
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        },
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          "vendor": "Linux",
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              "version": "6.17"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "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": [
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                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: act_api: avoid dereferencing ERR_PTR in tcf_idrinfo_destroy\n\nsyzbot reported a crash in tc_act_in_hw() during netns teardown where\ntcf_idrinfo_destroy() passed an ERR_PTR(-EBUSY) value as a tc_action\npointer, leading to an invalid dereference.\n\nGuard against ERR_PTR entries when iterating the action IDR so teardown\ndoes not call tc_act_in_hw() on an error pointer."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-01-23T15:24:08.865Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
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          "url": "https://git.kernel.org/stable/c/67550a1130b647bb0d093c9c0a810c69aa6a30a8"
        },
        {
          "url": "https://git.kernel.org/stable/c/adb25a46dc0a43173f5ea5f5f58fc8ba28970c7c"
        }
      ],
      "title": "net/sched: act_api: avoid dereferencing ERR_PTR in tcf_idrinfo_destroy",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-22987",
    "datePublished": "2026-01-23T15:24:08.865Z",
    "dateReserved": "2026-01-13T15:37:45.937Z",
    "dateUpdated": "2026-01-23T15:24:08.865Z",
    "state": "PUBLISHED"
  },
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}

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-39XQ-39V8-2G6G

CVE-2026-22987 (GCVE-0-2026-22987)

Tags

Sightings

Nomenclature