{"schema_version":"1.9.0","id":"CVE-2026-64563","published":"2026-08-04T06:23:22.601Z","modified":"2026-09-08T12:38:52.149417304Z","related":["ALSA-2026:64770","openSUSE-SU-2026:11476-1"],"summary":"rhashtable: clear stale iter->p on table restart","details":"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","affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5d240a8936f6a1d3ece06701e8c4d830a2eca8a8"},{"fixed":"ba510b5e9fe396497d31162acb579f210adfe6c8"},{"fixed":"a0406c40c6638c5ae50257db6297b2fba6c9ba16"},{"fixed":"0955b65c2b47c30b439e2cf1b1e375073aa0413a"},{"fixed":"c39643ad99fea749be50615550e8f0e6d6e60694"},{"fixed":"042fda5c088015f18838e5c692659a7be60aeb26"},{"fixed":"3ff7c1dbf722cf3fa538672452ba182318e0fcc3"},{"fixed":"4169d9fb92f313ff8e7e83d733c1ecdcc93eebd3"},{"fixed":"8173f7e2ce67e6ca1d4763f3da14e5b01ce77456"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64563.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.18.0"},{"fixed":"5.10.265"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.216"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.183"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.151"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.103"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.42"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64563.json"}}],"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/042fda5c088015f18838e5c692659a7be60aeb26"},{"type":"WEB","url":"https://git.kernel.org/stable/c/0955b65c2b47c30b439e2cf1b1e375073aa0413a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3ff7c1dbf722cf3fa538672452ba182318e0fcc3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4169d9fb92f313ff8e7e83d733c1ecdcc93eebd3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8173f7e2ce67e6ca1d4763f3da14e5b01ce77456"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a0406c40c6638c5ae50257db6297b2fba6c9ba16"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ba510b5e9fe396497d31162acb579f210adfe6c8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c39643ad99fea749be50615550e8f0e6d6e60694"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64563.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64563"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64563.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}