Vulnerability-Lookup

GHSA-CJR4-FWC8-QF28

Vulnerability from github – Published: 2026-05-13 18:30 – Updated: 2026-05-20 18:31

Details

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

net-shapers: don't free reply skb after genlmsg_reply()

genlmsg_reply() hands the reply skb to netlink, and netlink_unicast() consumes it on all return paths, whether the skb is queued successfully or freed on an error path.

net_shaper_nl_get_doit() and net_shaper_nl_cap_get_doit() currently jump to free_msg after genlmsg_reply() fails and call nlmsg_free(msg), which can hit the same skb twice.

Return the genlmsg_reply() error directly and keep free_msg only for pre-reply failures.

Severity ?

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-43481"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-13T16:16:51Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet-shapers: don\u0027t free reply skb after genlmsg_reply()\n\ngenlmsg_reply() hands the reply skb to netlink, and\nnetlink_unicast() consumes it on all return paths, whether the\nskb is queued successfully or freed on an error path.\n\nnet_shaper_nl_get_doit() and net_shaper_nl_cap_get_doit()\ncurrently jump to free_msg after genlmsg_reply() fails and call\nnlmsg_free(msg), which can hit the same skb twice.\n\nReturn the genlmsg_reply() error directly and keep free_msg\nonly for pre-reply failures.",
  "id": "GHSA-cjr4-fwc8-qf28",
  "modified": "2026-05-20T18:31:31Z",
  "published": "2026-05-13T18:30:57Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43481"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/57885276cc16a2e2b76282c808a4e84cbecb3aae"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/83f7b54242d0abbfce35a55c01322f50962ed3ee"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8738dcc844fff7d0157ee775230e95df3b1884d7"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-43481 (GCVE-0-2026-43481)

Vulnerability from cvelistv5 – Published: 2026-05-13 15:08 – Updated: 2026-05-20 16:08

Title

net-shapers: don't free reply skb after genlmsg_reply()

Summary

In the Linux kernel, the following vulnerability has been resolved: net-shapers: don't free reply skb after genlmsg_reply() genlmsg_reply() hands the reply skb to netlink, and netlink_unicast() consumes it on all return paths, whether the skb is queued successfully or freed on an error path. net_shaper_nl_get_doit() and net_shaper_nl_cap_get_doit() currently jump to free_msg after genlmsg_reply() fails and call nlmsg_free(msg), which can hit the same skb twice. Return the genlmsg_reply() error directly and keep free_msg only for pre-reply failures.

Severity ?

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux

References

3 references

URL	Tags
https://git.kernel.org/stable/c/8738dcc844fff7d01…
https://git.kernel.org/stable/c/83f7b54242d0abbfc…
https://git.kernel.org/stable/c/57885276cc16a2e2b…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 4b623f9f0f59652ea71fcb27d60b4c3b65126dbb , < 8738dcc844fff7d0157ee775230e95df3b1884d7 (git) Affected: 4b623f9f0f59652ea71fcb27d60b4c3b65126dbb , < 83f7b54242d0abbfce35a55c01322f50962ed3ee (git) Affected: 4b623f9f0f59652ea71fcb27d60b4c3b65126dbb , < 57885276cc16a2e2b76282c808a4e84cbecb3aae (git)
Linux	Linux	Affected: 6.13 Unaffected: 0 , < 6.13 (semver) Unaffected: 6.18.19 , ≤ 6.18.* (semver) Unaffected: 6.19.9 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/shaper/shaper.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "8738dcc844fff7d0157ee775230e95df3b1884d7",
              "status": "affected",
              "version": "4b623f9f0f59652ea71fcb27d60b4c3b65126dbb",
              "versionType": "git"
            },
            {
              "lessThan": "83f7b54242d0abbfce35a55c01322f50962ed3ee",
              "status": "affected",
              "version": "4b623f9f0f59652ea71fcb27d60b4c3b65126dbb",
              "versionType": "git"
            },
            {
              "lessThan": "57885276cc16a2e2b76282c808a4e84cbecb3aae",
              "status": "affected",
              "version": "4b623f9f0f59652ea71fcb27d60b4c3b65126dbb",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
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          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.13"
            },
            {
              "lessThan": "6.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.19",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "vulnerable": true
                },
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                }
              ],
              "negate": false,
              "operator": "OR"
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        }
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet-shapers: don\u0027t free reply skb after genlmsg_reply()\n\ngenlmsg_reply() hands the reply skb to netlink, and\nnetlink_unicast() consumes it on all return paths, whether the\nskb is queued successfully or freed on an error path.\n\nnet_shaper_nl_get_doit() and net_shaper_nl_cap_get_doit()\ncurrently jump to free_msg after genlmsg_reply() fails and call\nnlmsg_free(msg), which can hit the same skb twice.\n\nReturn the genlmsg_reply() error directly and keep free_msg\nonly for pre-reply failures."
        }
      ],
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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          }
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          "url": "https://git.kernel.org/stable/c/83f7b54242d0abbfce35a55c01322f50962ed3ee"
        },
        {
          "url": "https://git.kernel.org/stable/c/57885276cc16a2e2b76282c808a4e84cbecb3aae"
        }
      ],
      "title": "net-shapers: don\u0027t free reply skb after genlmsg_reply()",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43481",
    "datePublished": "2026-05-13T15:08:29.116Z",
    "dateReserved": "2026-05-01T14:12:56.012Z",
    "dateUpdated": "2026-05-20T16:08:09.154Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

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-CJR4-FWC8-QF28

CVE-2026-43481 (GCVE-0-2026-43481)

Tags

Sightings

Nomenclature