{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-72450","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-08-09T03:40:39.931Z","datePublished":"2026-08-15T05:56:58.939Z","dateUpdated":"2026-08-17T05:44:19.730Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-17T05:44:19.730Z"},"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 > 32.\n- Returning false in addr_match if prefixlen > 128 (prevents overflow)."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"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—installing the XFRM SA/policy over netlink and generating matching traffic—with 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>32 on IPv4 flows, and addr_match() can memcmp() up to (prefixlen>>5)<<2 bytes past 16-byte selector/flow addresses when prefixlen>128 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."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/net/xfrm.h","net/xfrm/xfrm_policy.c"],"versions":[{"version":"8df5cd51fd70c33aa1776e5cbcd82b0a86649d73","lessThan":"87a5bbccc7ff4edb3f42fea387124237d2ba91ee","status":"affected","versionType":"git"},{"version":"2d08a6c31c65f23db71a5385ee9cf9d8f9a67a71","lessThan":"bd7f202cf77556cff59f68dc30e4cdf40cb6e33b","status":"affected","versionType":"git"},{"version":"bce1afaa212ec380bf971614f70909a27882b862","lessThan":"a3968ad4195d72c8fddcc6c0ef39da95ac98711a","status":"affected","versionType":"git"},{"version":"7d9868180bd1e4cf37e7c5067362658971162366","lessThan":"efa9e3b9f3dea2e1ea4c7edf4edc863faef85986","status":"affected","versionType":"git"},{"version":"3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563","lessThan":"78783fefdc8f36879b1a17efa0d3195ea5f2dc5f","status":"affected","versionType":"git"},{"version":"3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563","lessThan":"6d99379c58f7f1c6ab2cc7aba01a4f52d71adcfe","status":"affected","versionType":"git"},{"version":"3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563","lessThan":"5a03a2ee17e8259dde631ed84fd8322db06cb2ae","status":"affected","versionType":"git"},{"version":"3f0ab59e6537c6a8f9e1b355b48f9c05a76e8563","lessThan":"40f0b1047918539f0b0f795ac65e35336b4c2c78","status":"affected","versionType":"git"},{"version":"f31398570acf0f0804c644006f7bfa9067106b0a","status":"affected","versionType":"git"},{"version":"401ad99a5ae7180dd9449eac104cb755f442e7f3","status":"affected","versionType":"git"},{"version":"e68dd80ba498265d2266b12dc3459164f4ff0c4a","status":"affected","versionType":"git"},{"version":"5.10.229","lessThan":"5.10.261","status":"affected","versionType":"semver"},{"version":"5.15.170","lessThan":"5.15.212","status":"affected","versionType":"semver"},{"version":"6.1.115","lessThan":"6.1.178","status":"affected","versionType":"semver"},{"version":"6.6.59","lessThan":"6.6.145","status":"affected","versionType":"semver"},{"version":"4.19.323","lessThan":"4.20","status":"affected","versionType":"semver"},{"version":"5.4.285","lessThan":"5.5","status":"affected","versionType":"semver"},{"version":"6.11.6","lessThan":"6.12","status":"affected","versionType":"semver"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/net/xfrm.h","net/xfrm/xfrm_policy.c"],"versions":[{"version":"6.12","status":"affected"},{"version":"0","lessThan":"6.12","status":"unaffected","versionType":"semver"},{"version":"5.10.261","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.212","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.178","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.145","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.97","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.40","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.5","lessThanOrEqual":"7.1.*","status":"unaffected","versionType":"semver"},{"version":"7.2","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.229","versionEndExcluding":"5.10.261"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.170","versionEndExcluding":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.115","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.59","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"6.12.97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12","versionEndExcluding":"7.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19.323"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.4.285"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.11.6"}]}]}],"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"}}}}