{"api_version":"1","generated_at":"2026-10-27T14:38:22+00:00","cve":"CVE-2026-72383","urls":{"html":"https://cve.report/CVE-2026-72383","api":"https://cve.report/api/cve/CVE-2026-72383.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-72383","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-72383"},"summary":{"title":"sctp: fix addr_wq_timer race in sctp_free_addr_wq()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: fix addr_wq_timer race in sctp_free_addr_wq()\n\nsctp_free_addr_wq() previously removed addr_wq_timer using timer_delete()\nwhile holding addr_wq_lock. However, timer_delete() does not guarantee that\na currently running timer handler has completed.\n\nThis allows a race with sctp_addr_wq_timeout_handler(), where the handler\nmay still run after addr_waitq has been freed, acquire addr_wq_lock, and\naccess freed memory, leading to a use-after-free.\n\nFix this by calling timer_shutdown_sync() before taking addr_wq_lock.  This\nguarantees that any in-flight timer handler has finished and prevents the\ntimer from being re-armed during teardown, making subsequent cleanup safe.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 06:22:11","updated_at":"2026-10-21 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Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72383","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4db67e808640e3934d82ce61ee8e2e89fd877ba8 5098308ad72f83f3b1a48c247dddab1695114bae git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4db67e808640e3934d82ce61ee8e2e89fd877ba8 d49eff15261dd62e4fa3a316c26cb1f537a60464 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4db67e808640e3934d82ce61ee8e2e89fd877ba8 a8323fb2ab6cd6978f359daeed6688e0cadf32ba git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4db67e808640e3934d82ce61ee8e2e89fd877ba8 c3e5cac47519d77ad36b9c03a1df1536aaa0c4a1 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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Vulnrichment"}],"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["net/sctp/protocol.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"5098308ad72f83f3b1a48c247dddab1695114bae","status":"affected","version":"4db67e808640e3934d82ce61ee8e2e89fd877ba8","versionType":"git"},{"lessThan":"d49eff15261dd62e4fa3a316c26cb1f537a60464","status":"affected","version":"4db67e808640e3934d82ce61ee8e2e89fd877ba8","versionType":"git"},{"lessThan":"a8323fb2ab6cd6978f359daeed6688e0cadf32ba","status":"affected","version":"4db67e808640e3934d82ce61ee8e2e89fd877ba8","versionType":"git"},{"lessThan":"c3e5cac47519d77ad36b9c03a1df1536aaa0c4a1","status":"affected","version":"4db67e808640e3934d82ce61ee8e2e89fd877ba8","versionType":"git"},{"lessThan":"976c19de0f22a857ba0112f39635f8fd7a257568","status":"affected","version":"4db67e808640e3934d82ce61ee8e2e89fd877ba8","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["net/sctp/protocol.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"3.7"},{"lessThan":"3.7","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.160","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.114","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.40","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.5","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.2","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.160","versionStartIncluding":"3.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.114","versionStartIncluding":"3.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.40","versionStartIncluding":"3.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.5","versionStartIncluding":"3.7","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2","versionStartIncluding":"3.7","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: fix addr_wq_timer race in sctp_free_addr_wq()\n\nsctp_free_addr_wq() previously removed addr_wq_timer using timer_delete()\nwhile holding addr_wq_lock. However, timer_delete() does not guarantee that\na currently running timer handler has completed.\n\nThis allows a race with sctp_addr_wq_timeout_handler(), where the handler\nmay still run after addr_waitq has been freed, acquire addr_wq_lock, and\naccess freed memory, leading to a use-after-free.\n\nFix this by calling timer_shutdown_sync() before taking addr_wq_lock.  This\nguarantees that any in-flight timer handler has finished and prevents the\ntimer from being re-armed during teardown, making subsequent cleanup safe."}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:L - The UAF is in sctp_free_addr_wq() during per-network-namespace SCTP teardown when a net namespace is destroyed; reaching it requires local syscalls (unshare/exit, SCTP socket/bind/setsockopt, rtnetlink address changes), not remote SCTP packet receive paths.\nAC:L - The attacker controls both sides of the race by creating a netns with SCTP AUTO_ASCONF sockets, queueing address events that arm addr_wq_timer (~500ms), and concurrently destroying that namespace; timer_delete() does not wait for sctp_addr_wq_timeout_handler(), so the UAF is reliably winnable.\nPR:L - An unprivileged local user can obtain CAP_NET_ADMIN in a new user+network namespace via unshare, bind an SCTP socket to INADDR_ANY, enable SCTP_AUTO_ASCONF, churn interface addresses to populate addr_waitq, and destroy the namespace; container tenants can trigger the same netns teardown without init-namespace root.\nUI:N - Exploitation is fully attacker-driven through scripted namespace create/configure/destroy and concurrent threads; no victim must mount filesystems, open files, or take any discretionary action beyond the attacker's own setup.\nS:U - The bug is kernel heap use-after-free of sctp_sockaddr_entry during netns teardown; impact is host kernel memory corruption and privilege escalation within the same kernel security authority, not a VM/hypervisor or IOMMU boundary crossing.\nC:H - sctp_addr_wq_timeout_handler() may walk addr_waitq and dereference sctp_sockaddr_entry fields after sctp_free_addr_wq() kfree()'s those entries; UAF on freed heap objects enables kernel memory disclosure and supports further exploitation primitives.\nI:H - The timer handler calls sctp_asconf_mgmt() on corrupted addrw pointers (address family, sockaddr, state), driving ASCONF add/delete processing on freed memory; UAF heap corruption is exploitable for arbitrary kernel write and potential code execution.\nA:H - Use-after-free in sctp_addr_wq_timeout_handler() during list iteration, socket locking, and sctp_asconf_mgmt() can cause kernel oops or panic from accesses to freed sctp_sockaddr_entry memory, even when full exploitation is not attempted."}]}],"providerMetadata":{"dateUpdated":"2026-10-21T12:44:46.181Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/5098308ad72f83f3b1a48c247dddab1695114bae"},{"url":"https://git.kernel.org/stable/c/d49eff15261dd62e4fa3a316c26cb1f537a60464"},{"url":"https://git.kernel.org/stable/c/a8323fb2ab6cd6978f359daeed6688e0cadf32ba"},{"url":"https://git.kernel.org/stable/c/c3e5cac47519d77ad36b9c03a1df1536aaa0c4a1"},{"url":"https://git.kernel.org/stable/c/976c19de0f22a857ba0112f39635f8fd7a257568"}],"title":"sctp: fix addr_wq_timer race in sctp_free_addr_wq()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-72383","datePublished":"2026-08-15T05:56:14.755Z","dateReserved":"2026-08-09T03:40:39.923Z","dateUpdated":"2026-10-21T12:44:46.181Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 06:22:11","lastModifiedDate":"2026-10-21 13:19:36","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":1.8,"impactScore":5.9}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-10-16T18:48:17.297535Z","id":"CVE-2026-72383","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"72383","Ordinal":"1","Title":"sctp: fix addr_wq_timer race in sctp_free_addr_wq()","CVE":"CVE-2026-72383","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"72383","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: fix addr_wq_timer race in sctp_free_addr_wq()\n\nsctp_free_addr_wq() previously removed addr_wq_timer using timer_delete()\nwhile holding addr_wq_lock. However, timer_delete() does not guarantee that\na currently running timer handler has completed.\n\nThis allows a race with sctp_addr_wq_timeout_handler(), where the handler\nmay still run after addr_waitq has been freed, acquire addr_wq_lock, and\naccess freed memory, leading to a use-after-free.\n\nFix this by calling timer_shutdown_sync() before taking addr_wq_lock.  This\nguarantees that any in-flight timer handler has finished and prevents the\ntimer from being re-armed during teardown, making subsequent cleanup safe.","Type":"Description","Title":"sctp: fix addr_wq_timer race in sctp_free_addr_wq()"}]}}}