CVE-2026-72450 (GCVE-0-2026-72450)
Vulnerability from cvelistv5
Published
2026-08-15 05:56
Modified
2026-10-16 18:55
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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).
References
Impacted products
Vendor Product Version
Linux Linux Version: 8df5cd51fd70c33aa1776e5cbcd82b0a86649d73
Version: 2d08a6c31c65f23db71a5385ee9cf9d8f9a67a71
Version: bce1afaa212ec380bf971614f70909a27882b862
Version: 7d9868180bd1e4cf37e7c5067362658971162366
Version: 3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563
Version: 3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563
Version: 3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563
Version: 3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563
Version: f31398570acf0f0804c644006f7bfa9067106b0a
Version: 401ad99a5ae7180dd9449eac104cb755f442e7f3
Version: e68dd80ba498265d2266b12dc3459164f4ff0c4a
Version: 5.10.229   ≤
Version: 5.15.170   ≤
Version: 6.1.115   ≤
Version: 6.6.59   ≤
Version: 4.19.323   ≤
Version: 5.4.285   ≤
Version: 6.11.6   ≤
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          "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)."
        }
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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",
            "version": "3.1"
          },
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              "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."
            }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/87a5bbccc7ff4edb3f42fea387124237d2ba91ee"
        },
        {
          "url": "https://git.kernel.org/stable/c/bd7f202cf77556cff59f68dc30e4cdf40cb6e33b"
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          "url": "https://git.kernel.org/stable/c/a3968ad4195d72c8fddcc6c0ef39da95ac98711a"
        },
        {
          "url": "https://git.kernel.org/stable/c/efa9e3b9f3dea2e1ea4c7edf4edc863faef85986"
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          "url": "https://git.kernel.org/stable/c/78783fefdc8f36879b1a17efa0d3195ea5f2dc5f"
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        },
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          "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": {
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  "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": "2026-10-16T18:55:24.828Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
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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 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\"78783fefdc8f36879b1a17efa0d3195ea5f2dc5f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563\", \"lessThan\": \"6d99379c58f7f1c6ab2cc7aba01a4f52d71adcfe\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563\", \"lessThan\": \"5a03a2ee17e8259dde631ed84fd8322db06cb2ae\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563\", \"lessThan\": \"40f0b1047918539f0b0f795ac65e35336b4c2c78\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"f31398570acf0f0804c644006f7bfa9067106b0a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"401ad99a5ae7180dd9449eac104cb755f442e7f3\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e68dd80ba498265d2266b12dc3459164f4ff0c4a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5.10.229\", \"lessThan\": \"5.10.261\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"5.15.170\", \"lessThan\": \"5.15.212\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.1.115\", \"lessThan\": \"6.1.178\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.6.59\", \"lessThan\": \"6.6.145\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"4.19.323\", \"lessThan\": \"4.20\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"5.4.285\", \"lessThan\": \"5.5\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"6.11.6\", \"lessThan\": \"6.12\", \"versionType\": \"semver\"}], \"programFiles\": [\"include/net/xfrm.h\", \"net/xfrm/xfrm_policy.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"6.12\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"6.12\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.261\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.212\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.178\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.145\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.97\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.40\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1.5\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.1.*\"}, {\"status\": \"unaffected\", \"version\": \"7.2\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"include/net/xfrm.h\", \"net/xfrm/xfrm_policy.c\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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).\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.261\", \"versionStartIncluding\": \"5.10.229\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.212\", \"versionStartIncluding\": \"5.15.170\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.178\", \"versionStartIncluding\": \"6.1.115\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.145\", \"versionStartIncluding\": \"6.6.59\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.97\", \"versionStartIncluding\": \"6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.40\", \"versionStartIncluding\": \"6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.5\", \"versionStartIncluding\": \"6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"6.12\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.19.323\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.4.285\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"6.11.6\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-17T05:44:19.730Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-72450\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-16T18:55:24.828Z\", \"dateReserved\": \"2026-08-09T03:40:39.931Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-15T05:56:58.939Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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