{"id":"CVE-2026-64563","revision":"67fafa896019419a820cf220e7d89a72","records":[{"revision":"67fafa896019419a820cf220e7d89a72","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-64563","aliases":[],"title":"rhashtable: clear stale iter->p on table restart","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nrhashtable: clear stale iter->p on table restart\n\nrhashtable_walk_start_check() has two restart paths when resuming a walk.\nWhen iter->walker.tbl is valid, it re-validates iter->p against the table\nand sets iter->p = NULL if the object is gone. When iter->walker.tbl is\nNULL (table was freed during resize), it resets slot and skip but forgets\nto clear iter->p.\n\nrhashtable_walk_next() then dereferences the stale iter->p, reading\nfreed memory. This is a use-after-free.\n\nAny caller that does multi-fragment rhashtable walks across\nwalk_stop/walk_start boundaries is affected. Concrete cases include\nnetlink_diag (__netlink_diag_dump in net/netlink/diag.c) and TIPC\n(tipc_nl_sk_walk in net/tipc/socket.c).\n\nCrash stack (netlink_diag):\n BUG: KASAN: slab-use-after-free in rhashtable_walk_next+0x365/0x3c0\n Read of size 8 at addr ffff88801a9d2438 (freed kmalloc-2k, offset 1080)\n Call Trace:\n rhashtable_walk_next+0x365/0x3c0 (lib/rhashtable.c:1016)\n __netlink_diag_dump+0x160/0x760 (net/netlink/diag.c:122)\n netlink_diag_dump+0xc2/0x240\n netlink_dump+0x5bc/0x1270\n netlink_recvmsg+0x7a3/0x980\n sock_recvmsg+0x1bc/0x200\n __sys_recvfrom+0x1d4/0x2c0","state":0,"publishedAt":"2026-08-04T06:23:22.601+00:00","modifiedAt":"2026-10-19T20:48:41.938+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"lib/rhashtable.c\"\n ],\n \"versions\": [\n {\n \"version\": \"5d240a8936f6a1d3ece06701e8c4d830a2eca8a8\",\n \"lessThan\": \"ba510b5e9fe396497d31162acb579f210adfe6c8\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5d240a8936f6a1d3ece06701e8c4d830a2eca8a8\",\n \"lessThan\": \"a0406c40c6638c5ae50257db6297b2fba6c9ba16\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5d240a8936f6a1d3ece06701e8c4d830a2eca8a8\",\n \"lessThan\": \"0955b65c2b47c30b439e2cf1b1e375073aa0413a\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5d240a8936f6a1d3ece06701e8c4d830a2eca8a8\",\n \"lessThan\": \"c39643ad99fea749be50615550e8f0e6d6e60694\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5d240a8936f6a1d3ece06701e8c4d830a2eca8a8\",\n \"lessThan\": \"042fda5c088015f18838e5c692659a7be60aeb26\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5d240a8936f6a1d3ece06701e8c4d830a2eca8a8\",\n \"lessThan\": \"3ff7c1dbf722cf3fa538672452ba182318e0fcc3\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5d240a8936f6a1d3ece06701e8c4d830a2eca8a8\",\n \"lessThan\": \"4169d9fb92f313ff8e7e83d733c1ecdcc93eebd3\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5d240a8936f6a1d3ece06701e8c4d830a2eca8a8\",\n \"lessThan\": \"8173f7e2ce67e6ca1d4763f3da14e5b01ce77456\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"lib/rhashtable.c\"\n ],\n \"versions\": [\n {\n \"version\": \"4.18\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"4.18\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.265\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.216\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.183\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.151\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.103\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.42\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1.6\",\n \"lessThanOrEqual\": \"7.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/ba510b5e9fe396497d31162acb579f210adfe6c8","https://git.kernel.org/stable/c/a0406c40c6638c5ae50257db6297b2fba6c9ba16","https://git.kernel.org/stable/c/0955b65c2b47c30b439e2cf1b1e375073aa0413a","https://git.kernel.org/stable/c/c39643ad99fea749be50615550e8f0e6d6e60694","https://git.kernel.org/stable/c/042fda5c088015f18838e5c692659a7be60aeb26","https://git.kernel.org/stable/c/3ff7c1dbf722cf3fa538672452ba182318e0fcc3","https://git.kernel.org/stable/c/4169d9fb92f313ff8e7e83d733c1ecdcc93eebd3","https://git.kernel.org/stable/c/8173f7e2ce67e6ca1d4763f3da14e5b01ce77456"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-64563","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-64563","identifiers":["CVE-2026-64563"]},"retained":false,"historicalAffected":[]}],"coverage":[]}