{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-68162","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-07-30T09:28:09.372Z","datePublished":"2026-08-10T11:59:29.099Z","dateUpdated":"2026-08-23T12:46:01.222Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-23T12:46:01.222Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: avoid auth_enable sysctl UAF during netns teardown\n\nproc_sctp_do_auth() updates the SCTP control socket after changing\nnet.sctp.auth_enable. The handler gets the per-net SCTP state from\nctl->data, so an already opened sysctl file can still target a network\nnamespace while that namespace is being torn down.\n\nSCTP previously registered its per-net sysctls from sctp_defaults_init(),\nwhile the control socket is created later from sctp_ctrlsock_init(). This\nexposed a window during initialization where auth_enable was writable\nbefore net->sctp.ctl_sock existed, and a teardown window where auth_enable\nstayed writable after inet_ctl_sock_destroy() had released the control\nsocket.\n\nMove the per-net SCTP sysctl registration into sctp_ctrlsock_init() after\nsctp_ctl_sock_init() succeeds, and unregister the sysctl table before\ndestroying the control socket in sctp_ctrlsock_exit(). If sysctl\nregistration fails after the control socket was created, destroy the\ncontrol socket in the same init path.\n\nMake sctp_sysctl_net_unregister() tolerate a missing header and clear the\nsaved pointer so init-error and exit paths can safely share the unregister\nhelper."}],"metrics":[{"cvssV3_1":{"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"},"scenarios":[{"lang":"en","value":"AV:L - The bug is triggered only by writing the per-net sysctl net.sctp.auth_enable via /proc/sys (proc_sctp_do_auth); it is not reachable from SCTP packet receive, sockets, or other remote protocol paths.\nAC:L - An attacker can open the sysctl file, concurrently destroy the target network namespace, and repeatedly write during teardown; pernet exit destroys ctl_sock before unregistering sysctls, and the attacker controls both sides of that race.\nPR:L - Exploitation requires writing a mode 0644 sysctl in a network namespace; an unprivileged host user with CAP_NET_ADMIN via user namespaces can create a netns, become namespace root, and write net/sctp/auth_enable without init-namespace privileges.\nUI:N - No victim interaction is required beyond the attacker opening the sysctl and triggering namespace teardown in their own threads or processes.\nS:U - Impact is confined to kernel memory corruption and privilege escalation within the same host/kernel security domain; it does not cross VM, container, or IOMMU boundaries by itself.\nC:H - proc_sctp_do_auth dereferences net->sctp.ctl_sock after inet_ctl_sock_destroy; lock_sock and sctp_sk(sk)->ep access freed socket/endpoint memory, a use-after-free that can disclose or infer heap contents.\nI:H - On a successful write, the handler sets sctp_sk(sk)->ep->auth_enable on a freed endpoint object, giving a controlled heap write primitive that can be developed into arbitrary kernel modification or code execution.\nA:H - Use-after-free on the SCTP control socket/endpoint during sysctl processing can cause kernel oops/panic from lock_sock or ep access on freed memory, even when full exploitation is not attempted."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/sctp/protocol.c","net/sctp/sysctl.c"],"versions":[{"version":"10c869a52f266e40f548cc3c565d14930a5edafc","lessThan":"19573dcddb8819fd68d6cd1f916c1c99c3fa4ff4","status":"affected","versionType":"git"},{"version":"dc583e7e5f8515ca489c0df28e4362a70eade382","lessThan":"ceb7190b5c873d4a1267a1600c5aa52c600e929f","status":"affected","versionType":"git"},{"version":"bd2a2939423566c654545fa3e96a656662a0af9e","lessThan":"fd66854a22661929245f3d2b244c432bc8b1a150","status":"affected","versionType":"git"},{"version":"1b67030d39f2b00f94ac1f0af11ba6657589e4d3","lessThan":"158f3cc332dc53f43ec20060233d7c3cecd6d912","status":"affected","versionType":"git"},{"version":"7ec30c54f339c640aa7e49d7e9f7bbed6bd42bf6","lessThan":"66700c0719675e0e118ae83b2d7168dacd69dd3d","status":"affected","versionType":"git"},{"version":"c184bc621e3cef03ac9ba81a50dda2dae6a21d36","lessThan":"626bda8cfe43dff19a9833ff6ba055a817b5455c","status":"affected","versionType":"git"},{"version":"15649fd5415eda664ef35780c2013adeb5d9c695","lessThan":"be6aae9d1b91c603adb35872d37d40e83daf8758","status":"affected","versionType":"git"},{"version":"15649fd5415eda664ef35780c2013adeb5d9c695","lessThan":"a50e73488e0bbdd262b3be3c9a1d8dd078382381","status":"affected","versionType":"git"},{"version":"15649fd5415eda664ef35780c2013adeb5d9c695","lessThan":"f8d5e7846025f4ab15a461235f8ebae9094a361a","status":"affected","versionType":"git"},{"version":"5.4.290","lessThan":"5.4.292","status":"affected","versionType":"semver"},{"version":"5.10.234","lessThan":"5.10.266","status":"affected","versionType":"semver"},{"version":"5.15.177","lessThan":"5.15.217","status":"affected","versionType":"semver"},{"version":"6.1.125","lessThan":"6.1.184","status":"affected","versionType":"semver"},{"version":"6.6.72","lessThan":"6.6.151","status":"affected","versionType":"semver"},{"version":"6.12.10","lessThan":"6.12.101","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/sctp/protocol.c","net/sctp/sysctl.c"],"versions":[{"version":"6.13","status":"affected"},{"version":"0","lessThan":"6.13","status":"unaffected","versionType":"semver"},{"version":"5.4.292","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.266","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.217","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.184","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.151","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.101","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.42","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.1.6","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":"5.4.290","versionEndExcluding":"5.4.292"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.234","versionEndExcluding":"5.10.266"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.177","versionEndExcluding":"5.15.217"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.125","versionEndExcluding":"6.1.184"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.72","versionEndExcluding":"6.6.151"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12.10","versionEndExcluding":"6.12.101"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"6.18.42"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"7.1.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.13","versionEndExcluding":"7.2"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/19573dcddb8819fd68d6cd1f916c1c99c3fa4ff4"},{"url":"https://git.kernel.org/stable/c/ceb7190b5c873d4a1267a1600c5aa52c600e929f"},{"url":"https://git.kernel.org/stable/c/fd66854a22661929245f3d2b244c432bc8b1a150"},{"url":"https://git.kernel.org/stable/c/158f3cc332dc53f43ec20060233d7c3cecd6d912"},{"url":"https://git.kernel.org/stable/c/66700c0719675e0e118ae83b2d7168dacd69dd3d"},{"url":"https://git.kernel.org/stable/c/626bda8cfe43dff19a9833ff6ba055a817b5455c"},{"url":"https://git.kernel.org/stable/c/be6aae9d1b91c603adb35872d37d40e83daf8758"},{"url":"https://git.kernel.org/stable/c/a50e73488e0bbdd262b3be3c9a1d8dd078382381"},{"url":"https://git.kernel.org/stable/c/f8d5e7846025f4ab15a461235f8ebae9094a361a"}],"title":"sctp: avoid auth_enable sysctl UAF during netns teardown","x_generator":{"engine":"bippy-1.2.0"}}}}