{ "document": { "category": "csaf_vex", "csaf_version": "2.0", "distribution": { "text": "TuxCare License Agreement", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://tuxcare.com/contact/", "name": "TuxCare", "namespace": "https://tuxcare.com/" }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/debian10els/vex/2026/cve-2026-64581-els_os-debian10els.json" } ], "tracking": { "current_release_date": "2026-08-29T08:29:27Z", "generator": { "date": "2026-08-29T08:29:27Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2026-64581-ELS_OS-DEBIAN10ELS", "initial_release_date": "2026-08-05T08:16:00Z", "revision_history": [ { "date": "2026-08-05T08:16:00Z", "number": "1", "summary": "Initial version" }, { "date": "2026-08-25T12:53:34Z", "number": "2", "summary": "Official Publication" }, { "date": "2026-08-29T08:29:27Z", "number": "3", "summary": "Update document" } ], "status": "final", "version": "3" }, "title": "Security update on CVE-2026-64581" }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "Debian 10", "product": { "name": "Debian 10", "product_id": "Debian-10", "product_identification_helper": { "cpe": "cpe:2.3:o:debian:debian_linux:10:*:*:*:*:*:*:*" } } } ], "category": "product_family", "name": "Debian" } ], "category": "vendor", "name": "Software in the Public Interest, Inc." }, { "branches": [ { "branches": [ { "category": "product_version", "name": "linux-headers-4.19.0-28-all-amd64-0:4.19.325-1+tuxcare.els1.amd64", "product": { "name": "linux-headers-4.19.0-28-all-amd64-0:4.19.325-1+tuxcare.els1.amd64", "product_id": "linux-headers-4.19.0-28-all-amd64-0:4.19.325-1+tuxcare.els1.amd64", "product_identification_helper": { "purl": "pkg:deb/tuxcare/linux-headers-4.19.0-28-all-amd64@4.19.325-1%2Btuxcare.els1?arch=amd64" } } }, { "category": "product_version", "name": 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10", "product_id": "Debian-10:hyperv-daemons-0:4.19.325-1+tuxcare.els1.amd64" }, "product_reference": "hyperv-daemons-0:4.19.325-1+tuxcare.els1.amd64", "relates_to_product_reference": "Debian-10" }, { "category": "default_component_of", "full_product_name": { "name": "linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1+tuxcare.els1.amd64 as a component of Debian 10", "product_id": "Debian-10:linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1+tuxcare.els1.amd64" }, "product_reference": "linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1+tuxcare.els1.amd64", "relates_to_product_reference": "Debian-10" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-64581", "notes": [ { "category": "description", "text": "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.", "title": "Vulnerability description" } ], "product_status": { "under_investigation": [ "Debian-10:hyperv-daemons-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libbpf-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libbpf4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libcpupower-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libcpupower1-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-compiler-gcc-8-x86-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-config-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-cpupower-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-doc-4.19-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-headers-4.19.0-28-all-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-28-all-amd64-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-28-amd64-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-28-common-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-image-amd64-signed-template-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-kbuild-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-libc-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-perf-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-source-4.19-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-support-4.19.0-28-0:4.19.325-1+tuxcare.els1.all" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2026-64581" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/96b678d08268b5f5c6fc99d4289d9b7e334fc683", "url": "https://git.kernel.org/stable/c/96b678d08268b5f5c6fc99d4289d9b7e334fc683" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/c283e9ada7fcb7dd4b10592623086b2e6d2f9925", "url": "https://git.kernel.org/stable/c/c283e9ada7fcb7dd4b10592623086b2e6d2f9925" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/0ea8f06454012d9e7f9c6e6253df710949bf6294", "url": "https://git.kernel.org/stable/c/0ea8f06454012d9e7f9c6e6253df710949bf6294" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/8dd8929b71c4f06c614f8f54c2cc070453faae16", "url": "https://git.kernel.org/stable/c/8dd8929b71c4f06c614f8f54c2cc070453faae16" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/a9340ebdc13f8bb5063c0bc0b037ee7e640d4ae9", "url": "https://git.kernel.org/stable/c/a9340ebdc13f8bb5063c0bc0b037ee7e640d4ae9" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/e8686fd8d18b99f3a9038683045b2f2338a7706d", "url": "https://git.kernel.org/stable/c/e8686fd8d18b99f3a9038683045b2f2338a7706d" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/f0ab9a71167bae308e05ab13b65e2007504a603f", "url": "https://git.kernel.org/stable/c/f0ab9a71167bae308e05ab13b65e2007504a603f" }, { "category": "external", "summary": "https://git.kernel.org/stable/c/f833821e4b52ab6335d443ede5fb79c38e61d19a", "url": "https://git.kernel.org/stable/c/f833821e4b52ab6335d443ede5fb79c38e61d19a" } ], "release_date": "2026-08-05T08:16:00Z", "remediations": [ { "category": "none_available", "date": "2026-08-18T12:14:00.526564Z", "details": "Affected", "product_ids": [ "Debian-10:hyperv-daemons-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libbpf-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libbpf4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libcpupower-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:libcpupower1-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-compiler-gcc-8-x86-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-config-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-cpupower-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-doc-4.19-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-headers-4.19.0-28-all-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-28-all-amd64-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-28-amd64-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-headers-4.19.0-28-common-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-image-4.19.0-28-amd64-unsigned-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-image-amd64-signed-template-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-kbuild-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-libc-dev-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-perf-4.19-0:4.19.325-1+tuxcare.els1.amd64", "Debian-10:linux-source-4.19-0:4.19.325-1+tuxcare.els1.all", "Debian-10:linux-support-4.19.0-28-0:4.19.325-1+tuxcare.els1.all" ] } ] } ] }