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

Vulnerability from cvelistv5 – Published: 2026-08-15 05:56 – Updated: 2026-10-16 18:55
VLAI
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
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 18:50 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6992 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
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)
guessed Create a notification for this product.
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)
guessed Create a notification for this product.
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      "title": "xfrm: validate selector family and prefixlen during match",
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    "dateUpdated": "2026-10-16T18:55:24.828Z",
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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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        "id": "CVE-2026-72450",
        "lastModified": "2026-10-16T19:17:31.217",
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                "confidentialityImpact": "HIGH",
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                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
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      "product_status:known_affected": "246",
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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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  }
}



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