CVE-2026-74398

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74398", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.891Z", "datePublished": "2026-08-15T05:59:10.113Z", "dateUpdated": "2026-10-16T19:05:41.331Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:46:43.132Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD\n\naddrconf_dad_failure() transitions ifp->state from DAD to POSTDAD\nvia addrconf_dad_end(), which drops ifp->lock on return. The lock\nis re-acquired after net_info_ratelimited(). A concurrent\nipv6_del_addr() can take the lock in that window, set ifp->state\nto DEAD and run list_del_rcu(&ifp->if_list).\n\naddrconf_dad_failure() then overwrites DEAD with ERRDAD at errdad:\nand schedules a new dad_work. The work calls ipv6_del_addr()\nagain, hitting the already-poisoned list entry:\n\n general protection fault: 0000 [#1] SMP NOPTI\n CPU: 4 PID: 217 Comm: kworker/4:1\n Workqueue: ipv6_addrconf addrconf_dad_work\n RIP: 0010:ipv6_del_addr+0xe9/0x280\n RAX: dead000000000122\n Call Trace:\n addrconf_dad_stop+0x113/0x140\n addrconf_dad_work+0x28c/0x430\n process_one_work+0x1eb/0x3b0\n worker_thread+0x4d/0x400\n kthread+0x104/0x140\n ret_from_fork+0x35/0x40\n\nFold the addrconf_dad_end() logic into addrconf_dad_failure() under\na single ifp->lock critical section. The STABLE_PRIVACY branch\ntemporarily drops ifp->lock around address regeneration, so at\nlock_errdad: verify the state is still POSTDAD before transitioning\nto ERRDAD; bail out otherwise to avoid overwriting a state set by\nanother path while the lock was released."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - The bug is reached from inbound ICMPv6 Neighbor Discovery (NS/NA) packets processed by icmp6_rcv()\u2192ndisc_rcv()\u2192addrconf_dad_failure(), the standard IPv6 network receive path on internet-facing servers, cloud VMs, phones, and IoT devices on shared L2 segments.\nAC:L - An attacker controls both sides of the race by flooding forged NS/NA during DAD while concurrently triggering ipv6_del_addr() via RTM_DELADDR/CAP_NET_ADMIN in a user namespace, CNI/orchestration address teardown, or interface-down processing; retries make the narrow window reliably winnable.\nPR:N - Triggering DAD failure requires only unauthenticated ND packet injection on the victim's link; the concurrent ipv6_del_addr() leg needs no victim credentials and can come from automatic address lifecycle events (CNI churn, SLAAC/privacy regeneration, netdev down) rather than attacker admin rights.\nUI:N - Exploitation does not require any victim user action such as opening files or mounting filesystems; it targets automatic IPv6 address configuration and DAD processing that occurs during normal network connectivity and boot.\nS:U - The corrupted inet6_ifaddr lifecycle and resulting kernel crash occur within kernel memory management; impact does not cross a VM, container, or IOMMU security boundary into a separate authority.\nC:H - The race leaves a freed/partially torn-down inet6_ifaddr with corrupted state and a poisoned RCU list entry (LIST_POISON2), constituting use-after-free class memory corruption that can expose adjacent kernel heap contents beyond a pure crash.\nI:H - Corrupting inet6_ifaddr state after list_del_rcu() and re-queuing dad_work on a dead object enables heap reuse and control of freed object contents, providing a path to arbitrary kernel memory writes and potential code execution beyond denial of service.\nA:H - The demonstrated failure is a general protection fault in ipv6_del_addr() from addrconf_dad_work on the ipv6_addrconf workqueue, causing a kernel oops/panic and complete loss of system availability on affected hosts."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv6/addrconf.c"], "versions": [{"version": "c15b1ccadb323ea50023e8f1cca2954129a62b51", "lessThan": "47b05836705b63dab93d9ac7c69a3a507375ef80", "status": "affected", "versionType": "git"}, {"version": "c15b1ccadb323ea50023e8f1cca2954129a62b51", "lessThan": "d21be7d051012c6b572fa4e3334443c250216f7b", "status": "affected", "versionType": "git"}, {"version": "c15b1ccadb323ea50023e8f1cca2954129a62b51", "lessThan": "875c284c0f98b042bb97abad460f63a24c977f88", "status": "affected", "versionType": "git"}, {"version": "c15b1ccadb323ea50023e8f1cca2954129a62b51", "lessThan": "8ed0ce9ea58d677d1bac92614ee5f60f8ea57363", "status": "affected", "versionType": "git"}, {"version": "c15b1ccadb323ea50023e8f1cca2954129a62b51", "lessThan": "3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb", "status": "affected", "versionType": "git"}, {"version": "c15b1ccadb323ea50023e8f1cca2954129a62b51", "lessThan": "b61af0268e3d1308c466bf0be5dced844eafc1ef", "status": "affected", "versionType": "git"}, {"version": "c15b1ccadb323ea50023e8f1cca2954129a62b51", "lessThan": "e889aa99ad3ed48bb0ddcff6475b17542532d18b", "status": "affected", "versionType": "git"}, {"version": "c15b1ccadb323ea50023e8f1cca2954129a62b51", "lessThan": "627ac78f2741e2ebd2225e2e953b6964a8a9182f", "status": "affected", "versionType": "git"}, {"version": "835b474b8f70fa68d68abffad37378e92f661802", "status": "affected", "versionType": "git"}, {"version": "3.10.105", "lessThan": "3.11", "status": "affected", "versionType": "semver"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv6/addrconf.c"], "versions": [{"version": "3.14", "status": "affected"}, {"version": "0", "lessThan": "3.14", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "5.10.261"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "5.15.212"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.1.178"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.6.145"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.12.97"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "6.18.40"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "7.1.5"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.14", "versionEndExcluding": "7.2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.10.105"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/47b05836705b63dab93d9ac7c69a3a507375ef80"}, {"url": "https://git.kernel.org/stable/c/d21be7d051012c6b572fa4e3334443c250216f7b"}, {"url": "https://git.kernel.org/stable/c/875c284c0f98b042bb97abad460f63a24c977f88"}, {"url": "https://git.kernel.org/stable/c/8ed0ce9ea58d677d1bac92614ee5f60f8ea57363"}, {"url": "https://git.kernel.org/stable/c/3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb"}, {"url": "https://git.kernel.org/stable/c/b61af0268e3d1308c466bf0be5dced844eafc1ef"}, {"url": "https://git.kernel.org/stable/c/e889aa99ad3ed48bb0ddcff6475b17542532d18b"}, {"url": "https://git.kernel.org/stable/c/627ac78f2741e2ebd2225e2e953b6964a8a9182f"}], "title": "ipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-74398", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T18:55:29.102774Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:05:41.331Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-74398", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T18:55:29.102774Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T18:55:30.235Z"}}], "cna": {"title": "ipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 9.8, "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}, "scenarios": [{"lang": "en", "value": "AV:N - The bug is reached from inbound ICMPv6 Neighbor Discovery (NS/NA) packets processed by icmp6_rcv()\u2192ndisc_rcv()\u2192addrconf_dad_failure(), the standard IPv6 network receive path on internet-facing servers, cloud VMs, phones, and IoT devices on shared L2 segments.\nAC:L - An attacker controls both sides of the race by flooding forged NS/NA during DAD while concurrently triggering ipv6_del_addr() via RTM_DELADDR/CAP_NET_ADMIN in a user namespace, CNI/orchestration address teardown, or interface-down processing; retries make the narrow window reliably winnable.\nPR:N - Triggering DAD failure requires only unauthenticated ND packet injection on the victim's link; the concurrent ipv6_del_addr() leg needs no victim credentials and can come from automatic address lifecycle events (CNI churn, SLAAC/privacy regeneration, netdev down) rather than attacker admin rights.\nUI:N - Exploitation does not require any victim user action such as opening files or mounting filesystems; it targets automatic IPv6 address configuration and DAD processing that occurs during normal network connectivity and boot.\nS:U - The corrupted inet6_ifaddr lifecycle and resulting kernel crash occur within kernel memory management; impact does not cross a VM, container, or IOMMU security boundary into a separate authority.\nC:H - The race leaves a freed/partially torn-down inet6_ifaddr with corrupted state and a poisoned RCU list entry (LIST_POISON2), constituting use-after-free class memory corruption that can expose adjacent kernel heap contents beyond a pure crash.\nI:H - Corrupting inet6_ifaddr state after list_del_rcu() and re-queuing dad_work on a dead object enables heap reuse and control of freed object contents, providing a path to arbitrary kernel memory writes and potential code execution beyond denial of service.\nA:H - The demonstrated failure is a general protection fault in ipv6_del_addr() from addrconf_dad_work on the ipv6_addrconf workqueue, causing a kernel oops/panic and complete loss of system availability on affected hosts."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "c15b1ccadb323ea50023e8f1cca2954129a62b51", "lessThan": "47b05836705b63dab93d9ac7c69a3a507375ef80", "versionType": "git"}, {"status": "affected", "version": "c15b1ccadb323ea50023e8f1cca2954129a62b51", "lessThan": "d21be7d051012c6b572fa4e3334443c250216f7b", "versionType": "git"}, {"status": "affected", "version": "c15b1ccadb323ea50023e8f1cca2954129a62b51", "lessThan": "875c284c0f98b042bb97abad460f63a24c977f88", "versionType": "git"}, {"status": "affected", "version": "c15b1ccadb323ea50023e8f1cca2954129a62b51", "lessThan": "8ed0ce9ea58d677d1bac92614ee5f60f8ea57363", "versionType": "git"}, {"status": "affected", "version": "c15b1ccadb323ea50023e8f1cca2954129a62b51", "lessThan": "3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb", "versionType": "git"}, {"status": "affected", "version": "c15b1ccadb323ea50023e8f1cca2954129a62b51", "lessThan": "b61af0268e3d1308c466bf0be5dced844eafc1ef", "versionType": "git"}, {"status": "affected", "version": "c15b1ccadb323ea50023e8f1cca2954129a62b51", "lessThan": "e889aa99ad3ed48bb0ddcff6475b17542532d18b", "versionType": "git"}, {"status": "affected", "version": "c15b1ccadb323ea50023e8f1cca2954129a62b51", "lessThan": "627ac78f2741e2ebd2225e2e953b6964a8a9182f", "versionType": "git"}, {"status": "affected", "version": "835b474b8f70fa68d68abffad37378e92f661802", "versionType": "git"}, {"status": "affected", "version": "3.10.105", "lessThan": "3.11", "versionType": "semver"}], "programFiles": ["net/ipv6/addrconf.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "3.14"}, {"status": "unaffected", "version": "0", "lessThan": "3.14", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.261", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.212", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.178", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.145", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.97", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.40", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.5", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/ipv6/addrconf.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/47b05836705b63dab93d9ac7c69a3a507375ef80"}, {"url": "https://git.kernel.org/stable/c/d21be7d051012c6b572fa4e3334443c250216f7b"}, {"url": "https://git.kernel.org/stable/c/875c284c0f98b042bb97abad460f63a24c977f88"}, {"url": "https://git.kernel.org/stable/c/8ed0ce9ea58d677d1bac92614ee5f60f8ea57363"}, {"url": "https://git.kernel.org/stable/c/3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb"}, {"url": "https://git.kernel.org/stable/c/b61af0268e3d1308c466bf0be5dced844eafc1ef"}, {"url": "https://git.kernel.org/stable/c/e889aa99ad3ed48bb0ddcff6475b17542532d18b"}, {"url": "https://git.kernel.org/stable/c/627ac78f2741e2ebd2225e2e953b6964a8a9182f"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD\n\naddrconf_dad_failure() transitions ifp->state from DAD to POSTDAD\nvia addrconf_dad_end(), which drops ifp->lock on return. The lock\nis re-acquired after net_info_ratelimited(). A concurrent\nipv6_del_addr() can take the lock in that window, set ifp->state\nto DEAD and run list_del_rcu(&ifp->if_list).\n\naddrconf_dad_failure() then overwrites DEAD with ERRDAD at errdad:\nand schedules a new dad_work. The work calls ipv6_del_addr()\nagain, hitting the already-poisoned list entry:\n\n general protection fault: 0000 [#1] SMP NOPTI\n CPU: 4 PID: 217 Comm: kworker/4:1\n Workqueue: ipv6_addrconf addrconf_dad_work\n RIP: 0010:ipv6_del_addr+0xe9/0x280\n RAX: dead000000000122\n Call Trace:\n addrconf_dad_stop+0x113/0x140\n addrconf_dad_work+0x28c/0x430\n process_one_work+0x1eb/0x3b0\n worker_thread+0x4d/0x400\n kthread+0x104/0x140\n ret_from_fork+0x35/0x40\n\nFold the addrconf_dad_end() logic into addrconf_dad_failure() under\na single ifp->lock critical section. The STABLE_PRIVACY branch\ntemporarily drops ifp->lock around address regeneration, so at\nlock_errdad: verify the state is still POSTDAD before transitioning\nto ERRDAD; bail out otherwise to avoid overwriting a state set by\nanother path while the lock was released."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.261", "versionStartIncluding": "3.14"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.212", "versionStartIncluding": "3.14"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.178", "versionStartIncluding": "3.14"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.145", "versionStartIncluding": "3.14"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.97", "versionStartIncluding": "3.14"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.40", "versionStartIncluding": "3.14"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.5", "versionStartIncluding": "3.14"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "3.14"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionStartIncluding": "3.10.105"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:46:43.132Z"}}}, "cveMetadata": {"cveId": "CVE-2026-74398", "state": "PUBLISHED", "dateUpdated": "2026-10-16T19:05:41.331Z", "dateReserved": "2026-08-15T05:44:03.891Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-15T05:59:10.113Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/ipv6/addrconf.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "47b05836705b63dab93d9ac7c69a3a507375ef80", "status": "affected", "version": "c15b1ccadb323ea50023e8f1cca2954129a62b51", "versionType": "git"}, {"lessThan": "d21be7d051012c6b572fa4e3334443c250216f7b", "status": "affected", "version": "c15b1ccadb323ea50023e8f1cca2954129a62b51", "versionType": "git"}, {"lessThan": "875c284c0f98b042bb97abad460f63a24c977f88", "status": "affected", "version": "c15b1ccadb323ea50023e8f1cca2954129a62b51", "versionType": "git"}, {"lessThan": "8ed0ce9ea58d677d1bac92614ee5f60f8ea57363", "status": "affected", "version": "c15b1ccadb323ea50023e8f1cca2954129a62b51", "versionType": "git"}, {"lessThan": "3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb", "status": "affected", "version": "c15b1ccadb323ea50023e8f1cca2954129a62b51", "versionType": "git"}, {"lessThan": "b61af0268e3d1308c466bf0be5dced844eafc1ef", "status": "affected", "version": "c15b1ccadb323ea50023e8f1cca2954129a62b51", "versionType": "git"}, {"lessThan": "e889aa99ad3ed48bb0ddcff6475b17542532d18b", "status": "affected", "version": "c15b1ccadb323ea50023e8f1cca2954129a62b51", "versionType": "git"}, {"lessThan": "627ac78f2741e2ebd2225e2e953b6964a8a9182f", "status": "affected", "version": "c15b1ccadb323ea50023e8f1cca2954129a62b51", "versionType": "git"}, {"status": "affected", "version": "835b474b8f70fa68d68abffad37378e92f661802", "versionType": "git"}, {"lessThan": "3.11", "status": "affected", "version": "3.10.105", "versionType": "semver"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/ipv6/addrconf.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "3.14"}, {"lessThan": "3.14", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.261", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.212", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.178", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.145", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.97", "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"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD\n\naddrconf_dad_failure() transitions ifp->state from DAD to POSTDAD\nvia addrconf_dad_end(), which drops ifp->lock on return. The lock\nis re-acquired after net_info_ratelimited(). A concurrent\nipv6_del_addr() can take the lock in that window, set ifp->state\nto DEAD and run list_del_rcu(&ifp->if_list).\n\naddrconf_dad_failure() then overwrites DEAD with ERRDAD at errdad:\nand schedules a new dad_work. The work calls ipv6_del_addr()\nagain, hitting the already-poisoned list entry:\n\n general protection fault: 0000 [#1] SMP NOPTI\n CPU: 4 PID: 217 Comm: kworker/4:1\n Workqueue: ipv6_addrconf addrconf_dad_work\n RIP: 0010:ipv6_del_addr+0xe9/0x280\n RAX: dead000000000122\n Call Trace:\n addrconf_dad_stop+0x113/0x140\n addrconf_dad_work+0x28c/0x430\n process_one_work+0x1eb/0x3b0\n worker_thread+0x4d/0x400\n kthread+0x104/0x140\n ret_from_fork+0x35/0x40\n\nFold the addrconf_dad_end() logic into addrconf_dad_failure() under\na single ifp->lock critical section. The STABLE_PRIVACY branch\ntemporarily drops ifp->lock around address regeneration, so at\nlock_errdad: verify the state is still POSTDAD before transitioning\nto ERRDAD; bail out otherwise to avoid overwriting a state set by\nanother path while the lock was released."}], "id": "CVE-2026-74398", "lastModified": "2026-10-16T20:17:25.390", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-74398", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T18:55:29.102774Z", "version": "2.0.3"}}]}, "published": "2026-08-15T06:22:41.790", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/47b05836705b63dab93d9ac7c69a3a507375ef80"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/627ac78f2741e2ebd2225e2e953b6964a8a9182f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/875c284c0f98b042bb97abad460f63a24c977f88"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/8ed0ce9ea58d677d1bac92614ee5f60f8ea57363"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b61af0268e3d1308c466bf0be5dced844eafc1ef"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d21be7d051012c6b572fa4e3334443c250216f7b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e889aa99ad3ed48bb0ddcff6475b17542532d18b"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: ipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD", "id": "2516924", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2516924"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-367", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD\naddrconf_dad_failure() transitions ifp->state from DAD to POSTDAD\nvia addrconf_dad_end(), which drops ifp->lock on return. The lock\nis re-acquired after net_info_ratelimited(). A concurrent\nipv6_del_addr() can take the lock in that window, set ifp->state\nto DEAD and run list_del_rcu(&ifp->if_list).\naddrconf_dad_failure() then overwrites DEAD with ERRDAD at errdad:\nand schedules a new dad_work. The work calls ipv6_del_addr()\nagain, hitting the already-poisoned list entry:\ngeneral protection fault: 0000 [#1] SMP NOPTI\nCPU: 4 PID: 217 Comm: kworker/4:1\nWorkqueue: ipv6_addrconf addrconf_dad_work\nRIP: 0010:ipv6_del_addr+0xe9/0x280\nRAX: dead000000000122\nCall Trace:\naddrconf_dad_stop+0x113/0x140\naddrconf_dad_work+0x28c/0x430\nprocess_one_work+0x1eb/0x3b0\nworker_thread+0x4d/0x400\nkthread+0x104/0x140\nret_from_fork+0x35/0x40\nFold the addrconf_dad_end() logic into addrconf_dad_failure() under\na single ifp->lock critical section. The STABLE_PRIVACY branch\ntemporarily drops ifp->lock around address regeneration, so at\nlock_errdad: verify the state is still POSTDAD before transitioning\nto ERRDAD; bail out otherwise to avoid overwriting a state set by\nanother path while the lock was released.", "A flaw was found in the Linux kernel's IPv6 address configuration (addrconf) component. A race condition can occur during the Duplicate Address Detection (DAD) failure handling. When `addrconf_dad_failure()` temporarily releases a lock, a concurrent `ipv6_del_addr()` operation can modify the network interface state. This can lead to a double-free or use-after-free condition, resulting in a general protection fault and a system crash, effectively causing a Denial of Service (DoS)."], "name": "CVE-2026-74398", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74398\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74398\nhttps://lore.kernel.org/linux-cve-announce/2026081508-CVE-2026-74398-b0da@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c15b1ccadb323ea50023e8f1cca2954129a62b51,47b05836705b63dab93d9ac7c69a3a507375ef80)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c15b1ccadb323ea50023e8f1cca2954129a62b51,d21be7d051012c6b572fa4e3334443c250216f7b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c15b1ccadb323ea50023e8f1cca2954129a62b51,875c284c0f98b042bb97abad460f63a24c977f88)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c15b1ccadb323ea50023e8f1cca2954129a62b51,8ed0ce9ea58d677d1bac92614ee5f60f8ea57363)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c15b1ccadb323ea50023e8f1cca2954129a62b51,3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c15b1ccadb323ea50023e8f1cca2954129a62b51,b61af0268e3d1308c466bf0be5dced844eafc1ef)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c15b1ccadb323ea50023e8f1cca2954129a62b51,e889aa99ad3ed48bb0ddcff6475b17542532d18b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[c15b1ccadb323ea50023e8f1cca2954129a62b51,627ac78f2741e2ebd2225e2e953b6964a8a9182f)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[835b474b8f70fa68d68abffad37378e92f661802,835b474b8f70fa68d68abffad37378e92f661802]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.10.105,3.11)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "3.14"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,3.14)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.261,6.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.212,6.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.178,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.145,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.97,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.40,7.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.5,8.0.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-15T17:00:12.632363+00:00", "updated": "2026-08-21T23:30:17.188392+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-362", "CWE-367"]}