{ "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": "2026-10-16T15:53:01.994Z" }, "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" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-68162", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2026-10-16T15:45:25.940723Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T15:53:01.994Z" } } ] } }