Vulnerability-Lookup

GHSA-J58F-WQFC-2RV4

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33

Details

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

xfrm: validate selector family and prefixlen during match

syzbot reported a shift-out-of-bounds in xfrm_selector_match() due to AF_UNSPEC selector with large prefixlen (e.g. 128) matched against IPv4 flow (when XFRM_STATE_AF_UNSPEC is set).

Fix this by:

Rejecting mismatched families in xfrm_selector_match.
Returning false in addr4_match if prefixlen > 32.
Returning false in addr_match if prefixlen > 128 (prevents overflow).

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-2026-72450"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:22:18Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: validate selector family and prefixlen during match\n\nsyzbot reported a shift-out-of-bounds in xfrm_selector_match()\ndue to AF_UNSPEC selector with large prefixlen (e.g. 128) matched\nagainst IPv4 flow (when XFRM_STATE_AF_UNSPEC is set).\n\nFix this by:\n\n- Rejecting mismatched families in xfrm_selector_match.\n- Returning false in addr4_match if prefixlen \u003e 32.\n- Returning false in addr_match if prefixlen \u003e 128 (prevents overflow).",
  "id": "GHSA-j58f-wqfc-2rv4",
  "modified": "2026-08-17T06:33:30Z",
  "published": "2026-08-15T06:32:24Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-72450"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/40f0b1047918539f0b0f795ac65e35336b4c2c78"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5a03a2ee17e8259dde631ed84fd8322db06cb2ae"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6d99379c58f7f1c6ab2cc7aba01a4f52d71adcfe"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/78783fefdc8f36879b1a17efa0d3195ea5f2dc5f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/87a5bbccc7ff4edb3f42fea387124237d2ba91ee"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a3968ad4195d72c8fddcc6c0ef39da95ac98711a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bd7f202cf77556cff59f68dc30e4cdf40cb6e33b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/efa9e3b9f3dea2e1ea4c7edf4edc863faef85986"
    }
  ],
  "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-2026-72450 (GCVE-0-2026-72450)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:56 – Updated: 2026-08-17 05:44

Title

xfrm: validate selector family and prefixlen during match

Summary

In the Linux kernel, the following vulnerability has been resolved: xfrm: validate selector family and prefixlen during match syzbot reported a shift-out-of-bounds in xfrm_selector_match() due to AF_UNSPEC selector with large prefixlen (e.g. 128) matched against IPv4 flow (when XFRM_STATE_AF_UNSPEC is set). Fix this by: - Rejecting mismatched families in xfrm_selector_match. - Returning false in addr4_match if prefixlen > 32. - Returning false in addr_match if prefixlen > 128 (prevents overflow).

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 mitre root

References

8 references

URL	Tags
https://git.kernel.org/stable/c/87a5bbccc7ff4edb3…
https://git.kernel.org/stable/c/bd7f202cf77556cff…
https://git.kernel.org/stable/c/a3968ad4195d72c8f…
https://git.kernel.org/stable/c/efa9e3b9f3dea2e1e…
https://git.kernel.org/stable/c/78783fefdc8f36879…
https://git.kernel.org/stable/c/6d99379c58f7f1c6a…
https://git.kernel.org/stable/c/5a03a2ee17e8259dd…
https://git.kernel.org/stable/c/40f0b1047918539f0…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 8df5cd51fd70c33aa1776e5cbcd82b0a86649d73 , < 87a5bbccc7ff4edb3f42fea387124237d2ba91ee (git) Affected: 2d08a6c31c65f23db71a5385ee9cf9d8f9a67a71 , < bd7f202cf77556cff59f68dc30e4cdf40cb6e33b (git) Affected: bce1afaa212ec380bf971614f70909a27882b862 , < a3968ad4195d72c8fddcc6c0ef39da95ac98711a (git) Affected: 7d9868180bd1e4cf37e7c5067362658971162366 , < efa9e3b9f3dea2e1ea4c7edf4edc863faef85986 (git) Affected: 3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563 , < 78783fefdc8f36879b1a17efa0d3195ea5f2dc5f (git) Affected: 3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563 , < 6d99379c58f7f1c6ab2cc7aba01a4f52d71adcfe (git) Affected: 3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563 , < 5a03a2ee17e8259dde631ed84fd8322db06cb2ae (git) Affected: 3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563 , < 40f0b1047918539f0b0f795ac65e35336b4c2c78 (git) Affected: f31398570acf0f0804c644006f7bfa9067106b0a (git) Affected: 401ad99a5ae7180dd9449eac104cb755f442e7f3 (git) Affected: e68dd80ba498265d2266b12dc3459164f4ff0c4a (git) Affected: 5.10.229 , < 5.10.261 (semver) Affected: 5.15.170 , < 5.15.212 (semver) Affected: 6.1.115 , < 6.1.178 (semver) Affected: 6.6.59 , < 6.6.145 (semver) Affected: 4.19.323 , < 4.20 (semver) Affected: 5.4.285 , < 5.5 (semver) Affected: 6.11.6 , < 6.12 (semver)
Linux	Linux	Affected: 6.12 Unaffected: 0 , < 6.12 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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{
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        {
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            "include/net/xfrm.h",
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              "status": "affected",
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            },
            {
              "status": "affected",
              "version": "e68dd80ba498265d2266b12dc3459164f4ff0c4a",
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            },
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              "status": "affected",
              "version": "5.15.170",
              "versionType": "semver"
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              "status": "affected",
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              "status": "affected",
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              "status": "affected",
              "version": "5.4.285",
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              "status": "affected",
              "version": "6.11.6",
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          "defaultStatus": "affected",
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          "programFiles": [
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            "net/xfrm/xfrm_policy.c"
          ],
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          "vendor": "Linux",
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              "version": "6.12"
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              "version": "0",
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              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.261",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                  "versionStartIncluding": "5.10.229",
                  "vulnerable": true
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                  "vulnerable": true
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                },
                {
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                },
                {
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                  "versionStartIncluding": "4.19.323",
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                },
                {
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                },
                {
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                  "versionStartIncluding": "6.11.6",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: validate selector family and prefixlen during match\n\nsyzbot reported a shift-out-of-bounds in xfrm_selector_match()\ndue to AF_UNSPEC selector with large prefixlen (e.g. 128) matched\nagainst IPv4 flow (when XFRM_STATE_AF_UNSPEC is set).\n\nFix this by:\n\n- Rejecting mismatched families in xfrm_selector_match.\n- Returning false in addr4_match if prefixlen \u003e 32.\n- Returning false in addr_match if prefixlen \u003e 128 (prevents overflow)."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is armed via NETLINK_XFRM (XFRM_MSG_NEWSA with XFRM_STATE_AF_UNSPEC) in xfrm_user_rcv_msg(), and per kernel CNA guidance xfrm/netlink configuration is Local even though xfrm_selector_match() is later hit from IPv4/IPv6 packet processing in __xfrm_policy_check() and xfrm_state_look_at().\nAC:L - The attacker fully controls the malformed SA selector (AF_UNSPEC with prefixlen up to 255) and can deterministically trigger matching by sending or receiving IPv4/IPv6 traffic through xfrm; no race, victim state, or memory layout outside attacker control is required.\nPR:L - xfrm_user_rcv_msg() requires netlink_net_capable(CAP_NET_ADMIN), evaluated against the socket net namespace user_ns via ns_capable(); an unprivileged local user obtains CAP_NET_ADMIN with unshare -Urn and can install the poisoned SA and matching policy in that namespace.\nUI:N - The attacker performs the entire sequence\u2014installing the XFRM SA/policy over netlink and generating matching traffic\u2014with no action required from any other user, administrator, or victim.\nS:U - The shift-out-of-bounds and out-of-bounds memcmp reads occur entirely within kernel xfrm selector matching on the same host; no VM escape, IOMMU bypass, or cross-security-authority boundary is crossed.\nC:H - addr4_match() performs an undefined left-shift when prefixlen\u003e32 on IPv4 flows, and addr_match() can memcmp() up to (prefixlen\u003e\u003e5)\u003c\u003c2 bytes past 16-byte selector/flow addresses when prefixlen\u003e128 on IPv6, leaking adjacent kernel memory per CNA OOB-read guidance.\nI:H - C11 undefined-behavior shifts in hot-path packet classification and unchecked prefix comparisons can corrupt mask/offset arithmetic and selector-match control flow, giving attacker-influenced kernel behavior exploitable for integrity compromise per CNA memory-unsafe-operation guidance.\nA:H - syzbot reproduced UBSAN shift-out-of-bounds in xfrm_selector_match(), and undefined shifts plus out-of-bounds reads in the xfrm input/policy-check path can provoke kernel oops/panic (especially with panic_on_warn/KASAN), satisfying CNA guidance that kernel crashes are High availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:44:19.730Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/87a5bbccc7ff4edb3f42fea387124237d2ba91ee"
        },
        {
          "url": "https://git.kernel.org/stable/c/bd7f202cf77556cff59f68dc30e4cdf40cb6e33b"
        },
        {
          "url": "https://git.kernel.org/stable/c/a3968ad4195d72c8fddcc6c0ef39da95ac98711a"
        },
        {
          "url": "https://git.kernel.org/stable/c/efa9e3b9f3dea2e1ea4c7edf4edc863faef85986"
        },
        {
          "url": "https://git.kernel.org/stable/c/78783fefdc8f36879b1a17efa0d3195ea5f2dc5f"
        },
        {
          "url": "https://git.kernel.org/stable/c/6d99379c58f7f1c6ab2cc7aba01a4f52d71adcfe"
        },
        {
          "url": "https://git.kernel.org/stable/c/5a03a2ee17e8259dde631ed84fd8322db06cb2ae"
        },
        {
          "url": "https://git.kernel.org/stable/c/40f0b1047918539f0b0f795ac65e35336b4c2c78"
        }
      ],
      "title": "xfrm: validate selector family and prefixlen during match",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72450",
    "datePublished": "2026-08-15T05:56:58.939Z",
    "dateReserved": "2026-08-09T03:40:39.931Z",
    "dateUpdated": "2026-08-17T05:44:19.730Z",
    "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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

GHSA-J58F-WQFC-2RV4

CVE-2026-72450 (GCVE-0-2026-72450)

Tags

Sightings

Nomenclature