{"api_version":"1","generated_at":"2026-10-24T09:36:02+00:00","cve":"CVE-2026-99053","urls":{"html":"https://cve.report/CVE-2026-99053","api":"https://cve.report/api/cve/CVE-2026-99053.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-99053","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-99053"},"summary":{"title":"tipc: hold a reference to nodes found by link name","description":"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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-10-23 13:17:28","updated_at":"2026-10-23 13:17:28"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/1428c5f1d346a2e1ac9156713975a72246957009","name":"https://git.kernel.org/stable/c/1428c5f1d346a2e1ac9156713975a72246957009","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f17e70206a1e763fcca2578a8db3c4eed0f843a9","name":"https://git.kernel.org/stable/c/f17e70206a1e763fcca2578a8db3c4eed0f843a9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b60259d4047fbb735476c729dcf9306a038b6110","name":"https://git.kernel.org/stable/c/b60259d4047fbb735476c729dcf9306a038b6110","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/17e73bae400f6a434dc006e3bee92c94cf781954","name":"https://git.kernel.org/stable/c/17e73bae400f6a434dc006e3bee92c94cf781954","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3c3b308ee6e25729a6cf09b69cdd0e093220d40b","name":"https://git.kernel.org/stable/c/3c3b308ee6e25729a6cf09b69cdd0e093220d40b","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-99053","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-99053","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6a939f365bdb03a74b4617bdb4402fc08da088b9 b60259d4047fbb735476c729dcf9306a038b6110 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6a939f365bdb03a74b4617bdb4402fc08da088b9 f17e70206a1e763fcca2578a8db3c4eed0f843a9 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6a939f365bdb03a74b4617bdb4402fc08da088b9 1428c5f1d346a2e1ac9156713975a72246957009 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6a939f365bdb03a74b4617bdb4402fc08da088b9 3c3b308ee6e25729a6cf09b69cdd0e093220d40b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6a939f365bdb03a74b4617bdb4402fc08da088b9 17e73bae400f6a434dc006e3bee92c94cf781954 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4.19","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 4.19 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.160 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.113 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.57 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.11 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/tipc/node.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"b60259d4047fbb735476c729dcf9306a038b6110","status":"affected","version":"6a939f365bdb03a74b4617bdb4402fc08da088b9","versionType":"git"},{"lessThan":"f17e70206a1e763fcca2578a8db3c4eed0f843a9","status":"affected","version":"6a939f365bdb03a74b4617bdb4402fc08da088b9","versionType":"git"},{"lessThan":"1428c5f1d346a2e1ac9156713975a72246957009","status":"affected","version":"6a939f365bdb03a74b4617bdb4402fc08da088b9","versionType":"git"},{"lessThan":"3c3b308ee6e25729a6cf09b69cdd0e093220d40b","status":"affected","version":"6a939f365bdb03a74b4617bdb4402fc08da088b9","versionType":"git"},{"lessThan":"17e73bae400f6a434dc006e3bee92c94cf781954","status":"affected","version":"6a939f365bdb03a74b4617bdb4402fc08da088b9","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/tipc/node.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.19"},{"lessThan":"4.19","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.160","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.113","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.57","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.11","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.160","versionStartIncluding":"4.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.113","versionStartIncluding":"4.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.57","versionStartIncluding":"4.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.11","versionStartIncluding":"4.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3","versionStartIncluding":"4.19","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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."}],"providerMetadata":{"dateUpdated":"2026-10-23T12:22:35.462Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/b60259d4047fbb735476c729dcf9306a038b6110"},{"url":"https://git.kernel.org/stable/c/f17e70206a1e763fcca2578a8db3c4eed0f843a9"},{"url":"https://git.kernel.org/stable/c/1428c5f1d346a2e1ac9156713975a72246957009"},{"url":"https://git.kernel.org/stable/c/3c3b308ee6e25729a6cf09b69cdd0e093220d40b"},{"url":"https://git.kernel.org/stable/c/17e73bae400f6a434dc006e3bee92c94cf781954"}],"title":"tipc: hold a reference to nodes found by link name","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-99053","datePublished":"2026-10-23T12:22:35.462Z","dateReserved":"2026-09-25T10:25:14.388Z","dateUpdated":"2026-10-23T12:22:35.462Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-23 13:17:28","lastModifiedDate":"2026-10-23 13:17:28","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"99053","Ordinal":"1","Title":"tipc: hold a reference to nodes found by link name","CVE":"CVE-2026-99053","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"99053","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"tipc: hold a reference to nodes found by link name"}]}}}