{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2026-64581", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-64581", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-08-05T08:09:35.556Z", "updatedAt": "2026-10-19T20:48:43.050Z", "importedAt": "2026-10-24T01:58:25.636Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "xfrm: fix sk_dst_cache double-free in xfrm_user_policy()", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: fix sk_dst_cache double-free in xfrm_user_policy()\n\nxfrm_user_policy() clears the socket dst cache with __sk_dst_reset(),\ni.e. the non-atomic __sk_dst_set(sk, NULL): it reads sk_dst_cache with\nrcu_dereference_protected(), stores NULL and dst_release()s the old dst.\nThat is only safe if no other thread modifies sk_dst_cache concurrently.\n\nFor a connected UDP socket that does not hold: the transmit fast path\n(udp_sendmsg -> sk_dst_check -> sk_dst_reset) resets the cache locklessly\nwith an atomic xchg(). A per-socket policy change racing a send can make\nboth sides observe the same old dst and each dst_release() it, dropping\nthe socket's single reference twice and freeing the xfrm_dst bundle while\nit is still referenced:\n\n BUG: KASAN: slab-use-after-free in dst_release\n Write of size 4 at addr ffff88801897b6c0 by task exploit/155\n Call Trace:\n ...\n dst_release (... ./include/linux/rcuref.h:109)\n xfrm_user_policy (./include/net/sock.h:2239 ./include/net/sock.h:2256 net/xfrm/xfrm_state.c:3053)\n do_ip_setsockopt (net/ipv4/ip_sockglue.c:1347)\n ip_setsockopt (net/ipv4/ip_sockglue.c:1417)\n do_sock_setsockopt (net/socket.c:2368)\n __sys_setsockopt (net/socket.c:2393)\n __x64_sys_setsockopt (net/socket.c:2396)\n do_syscall_64 (arch/x86/entry/syscall_64.c:94)\n entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)\n\nReachable by an unprivileged user via a user+network namespace.\n\nUse the atomic sk_dst_reset() so the cache is cleared and released with a\nsingle xchg(): whichever side wins releases the dst once, the other sees\nNULL and does nothing. Behaviour is otherwise unchanged.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "2b06cdf3e688b98fcc9945873b5d42792bd4eee0", "status": "affected", "versionType": "git", "lessThan": "e8686fd8d18b99f3a9038683045b2f2338a7706d" }, { "version": "2b06cdf3e688b98fcc9945873b5d42792bd4eee0", "status": "affected", "versionType": "git", "lessThan": "a9340ebdc13f8bb5063c0bc0b037ee7e640d4ae9" }, { "version": "2b06cdf3e688b98fcc9945873b5d42792bd4eee0", "status": "affected", "versionType": "git", "lessThan": "f833821e4b52ab6335d443ede5fb79c38e61d19a" }, { "version": "2b06cdf3e688b98fcc9945873b5d42792bd4eee0", "status": "affected", "versionType": "git", "lessThan": "f0ab9a71167bae308e05ab13b65e2007504a603f" }, { "version": "2b06cdf3e688b98fcc9945873b5d42792bd4eee0", "status": "affected", "versionType": "git", "lessThan": "8dd8929b71c4f06c614f8f54c2cc070453faae16" }, { "version": "2b06cdf3e688b98fcc9945873b5d42792bd4eee0", "status": "affected", "versionType": "git", "lessThan": "0ea8f06454012d9e7f9c6e6253df710949bf6294" }, { "version": "2b06cdf3e688b98fcc9945873b5d42792bd4eee0", "status": "affected", "versionType": "git", "lessThan": "96b678d08268b5f5c6fc99d4289d9b7e334fc683" }, { "version": "2b06cdf3e688b98fcc9945873b5d42792bd4eee0", "status": "affected", "versionType": "git", "lessThan": "c283e9ada7fcb7dd4b10592623086b2e6d2f9925" }, { "version": "72f157be2f81910ae759bfe2e5c2256fc4625645", "status": "affected", "versionType": "git" }, { "version": "9e9fe58a92a46c6d154d2901735bf230d91b8507", "status": "affected", "versionType": "git" }, { "version": "adc1ec6cdc20d430aa01b86497220709b9149466", "status": "affected", "versionType": "git" }, { "version": "b54033eb1cfd77aba471269ddd804ed8d3e35dea", "status": "affected", "versionType": "git" }, { "version": "c9e82cb34c3c2ee895af01bc899c6ed0bc6eb04a", "status": "affected", "versionType": "git" }, { "version": "5eef9b51114fcc65651d671add52f267f91b9451", "status": "affected", "versionType": "git" }, { "version": "3.16.52", "status": "affected", "versionType": "semver", "lessThan": "3.17" }, { "version": "4.4.163", "status": "affected", "versionType": "semver", "lessThan": "4.5" }, { "version": "3.18.101", "status": "affected", "versionType": "semver", "lessThan": "3.19" }, { "version": "4.1.52", "status": "affected", "versionType": "semver", "lessThan": "4.2" }, { "version": "4.4.123", "status": "affected", "versionType": "semver", "lessThan": "4.5" }, { "version": "4.9.89", "status": "affected", "versionType": "semver", "lessThan": "4.10" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "4.14", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "4.14" }, { "version": "5.10.267", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.218", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.185", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.154", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.106", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.18.47", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "7.1.6", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "7.1.*" }, { "version": "7.2", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }