{"schema":"threatline.record/2","record":{"id":"CVE-2026-99053","aliases":[],"summary":"tipc: hold a reference to nodes found by link name","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: hold a reference to nodes found by link name\n\ntipc_node_find_by_name() returns a node after dropping its RCU read lock\nwithout taking a reference.  The LINK_SET, LINK_GET and LINK_RESET_STATS\nhandlers then lock and access the node, racing with timer-driven cleanup of\na down peer.  Generic netlink serialization does not exclude the node\ntimer.\n\nThe following interleaving can leave a handler using a freed node:\n\n  CPU 0: find the node under RCU and release the node read lock\n  CPU 1: tipc_node_timeout() clears the links and unlinks the down node\n  CPU 1: drop the list and timer references, queuing tipc_node_free()\n  CPU 0: leave the RCU read-side critical section\n  CPU 1: complete the grace period and free the node\n  CPU 0: acquire the node lock through the stale pointer\n\nLINK_SET also uses the node's media address after releasing the node lock,\nwhen passing queued packets to tipc_bearer_xmit().\n\nKASAN on v7.3-rc5 reported:\n\n  BUG: KASAN: slab-use-after-free in _raw_read_lock_bh\n  Write of size 4 at addr ffff88807e06f008 by task poc/92\n  Call Trace:\n   _raw_read_lock_bh                 kernel/locking/spinlock.c:287\n   tipc_nl_node_set_link             net/tipc/node.c:2475\n   genl_family_rcv_msg_doit          net/netlink/genetlink.c:1114\n   genl_rcv_msg                      net/netlink/genetlink.c:1209\n   netlink_rcv_skb                   net/netlink/af_netlink.c:2575\n\n  Allocated by task 0:\n   tipc_node_create                  net/tipc/node.c:539\n   tipc_node_check_dest              net/tipc/node.c:1196\n   tipc_disc_rcv                     net/tipc/discover.c:252\n\n  Freed by task 92:\n   kfree                             mm/slub.c:6801\n   rcu_core                          kernel/rcu/tree.c:2919\n\n  Last potentially related work creation:\n   __call_rcu_common.constprop.0     kernel/rcu/tree.c:3181\n   tipc_node_timeout                 net/tipc/node.c:814\n\nAcquire a reference to the selected node with kref_get_unless_zero() before\nleaving RCU, returning NULL if the node has already been released.  Release\nthat reference on every caller exit after the last node access, including\ntransmission in LINK_SET.  Keep the existing link lookup order and locking\nso concurrent link removal still takes the existing error paths.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99053","source_modified_at":"2026-10-23T12:22:35.462Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Linux","vendor":"Linux","versions":[{"version":"6a939f365bdb03a74b4617bdb4402fc08da088b9","lessThan":"b60259d4047fbb735476c729dcf9306a038b6110","status":"affected","versionType":"git"},{"version":"6a939f365bdb03a74b4617bdb4402fc08da088b9","lessThan":"f17e70206a1e763fcca2578a8db3c4eed0f843a9","status":"affected","versionType":"git"},{"version":"6a939f365bdb03a74b4617bdb4402fc08da088b9","lessThan":"1428c5f1d346a2e1ac9156713975a72246957009","status":"affected","versionType":"git"},{"version":"6a939f365bdb03a74b4617bdb4402fc08da088b9","lessThan":"3c3b308ee6e25729a6cf09b69cdd0e093220d40b","status":"affected","versionType":"git"},{"version":"6a939f365bdb03a74b4617bdb4402fc08da088b9","lessThan":"17e73bae400f6a434dc006e3bee92c94cf781954","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99053","source_modified_at":"2026-10-23T12:22:35.462Z","fetched_at":"2026-10-23T18:42:43.628194Z","product":"Linux","vendor":"Linux","versions":[{"version":"4.19","status":"affected"},{"version":"0","lessThan":"4.19","status":"unaffected","versionType":"semver"},{"version":"6.6.160","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.113","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.57","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.11","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99053","source_modified_at":"2026-10-23T12:22:35.462Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Linux","ecosystem":null},"version":"1428c5f1d346a2e1ac9156713975a72246957009","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99053","source_modified_at":"2026-10-23T12:22:35.462Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Linux","ecosystem":null},"version":"3c3b308ee6e25729a6cf09b69cdd0e093220d40b","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-99053","source_modified_at":"2026-10-23T12:22:35.462Z","fetched_at":"2026-10-23T18:42:43.628194Z","package":{"name":"Linux","ecosystem":null},"version":"17e73bae400f6a434dc006e3bee92c94cf781954","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":null,"percentile":null,"score_date":null},"published_at":"2026-10-23T12:22:35.462Z","modified_at":"2026-10-23T12:22:35.462Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-99053","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23T12:22:35.462Z"}],"sources":["CVE List"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/b60259d4047fbb735476c729dcf9306a038b6110"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/f17e70206a1e763fcca2578a8db3c4eed0f843a9"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/1428c5f1d346a2e1ac9156713975a72246957009"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/3c3b308ee6e25729a6cf09b69cdd0e093220d40b"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/17e73bae400f6a434dc006e3bee92c94cf781954"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-23T12:22:35.462Z","content_hash":"fec8b77316756d8697fa197f9ce8287930623021837c293f68d64a57610c0d2a"}}