{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-68117", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.369Z", "datePublished": "2026-08-10T11:58:36.675Z", "dateUpdated": "2026-08-19T16:29:29.277Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:29:29.277Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: clear sock->sk on the failed-insert path in tipc_sk_create()\n\nWhen tipc_sk_create() fails to insert the new socket (tipc_sk_insert()\nreturns non-zero), its error path frees the sk with sk_free() but leaves\nsock->sk pointing at the freed object:\n\n\tif (tipc_sk_insert(tsk)) {\n\t\tsk_free(sk);\n\t\tpr_warn(\"Socket create failed; port number exhausted\\n\");\n\t\treturn -EINVAL;\n\t}\n\nThis is harmless for plain socket(): the syscall layer clears sock->ops\nbefore releasing, so tipc_release() is never called. It is not harmless\non the accept() path. tipc_accept() creates the pre-allocated child\nsocket with tipc_sk_create(net, new_sock, 0, kern); on failure it leaves\nnew_sock->sk dangling and new_sock->ops non-NULL, and do_accept() then\nfput()s the new file, so __sock_release() -> tipc_release() runs\nlock_sock(new_sock->sk) on the freed sk -- a use-after-free write of the\nsk_lock spinlock.\n\ntipc_release() already guards this exact \"failed accept() releases a\npre-allocated child\" case with \"if (sk == NULL) return 0;\", but the\nguard is bypassed because tipc_sk_create() left sock->sk non-NULL\n(dangling) rather than NULL.\n\nClear sock->sk on the failed-insert path so the existing tipc_release()\nNULL check fires and the use-after-free is avoided.\n\nThe tipc_sk_insert() failure is reached when the per-netns socket\nrhashtable hits its max_size (tsk_rht_params.max_size = 1048576, ~2M\nelements) -- i.e. once a netns holds ~2M TIPC sockets every insert\nreturns -E2BIG.\n\n BUG: KASAN: slab-use-after-free in lock_sock_nested (net/core/sock.c:3839)\n Write of size 8 at addr ffff8880047cdc38 by task init/1\n lock_sock_nested (net/core/sock.c:3839)\n tipc_release (net/tipc/socket.c:638)\n __sock_release (net/socket.c:710)\n sock_close (net/socket.c:1501)\n __fput (fs/file_table.c:512)\n Allocated by task 1:\n sk_alloc (net/core/sock.c:2308)\n tipc_sk_create (net/tipc/socket.c:487)\n tipc_accept (net/tipc/socket.c:2744)\n do_accept (net/socket.c:2034)\n Freed by task 1:\n __sk_destruct (net/core/sock.c:2391)\n tipc_sk_create (net/tipc/socket.c:504)\n tipc_accept (net/tipc/socket.c:2744)\n do_accept (net/socket.c:2034)" } ], "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 hit in tipc_accept() when a listening SOCK_STREAM/SOCK_SEQPACKET socket accepts an incoming TIPC connection; peers reach this path over default UDP/Ethernet bearers (e.g. UDP/6118) without local syscall access.\nAC:L - An attacker can deterministically fill the per-netns TIPC socket rhashtable (~2M entries) by opening many sockets or connections, then trigger the failed-insert accept() cleanup path that performs lock_sock() on the freed sk.\nPR:N - No elevated Linux capabilities are required to create AF_TIPC stream/seqpacket sockets or send unauthenticated TIPC SYN traffic to a listening cluster service; only LSM policy may restrict access.\nUI:N - Exploitation needs no end-user action beyond a server’s normal accept() loop processing inbound TIPC connection requests queued by the network stack.\nS:U - The use-after-free corrupts kernel heap memory within the same kernel security domain; impact is kernel privilege escalation or crash, not a VM/hypervisor or IOMMU boundary crossing.\nC:H - tipc_release() calls lock_sock() on a freed struct sock, a slab use-after-free that can be groomed for arbitrary kernel memory disclosure via controlled reuse of the freed socket object.\nI:H - The UAF performs an 8-byte write to sk_lock on freed memory during socket teardown, enabling heap corruption and potential arbitrary kernel write or code execution primitives.\nA:H - KASAN reports slab-use-after-free in lock_sock_nested during tipc_release on the failed accept() path, causing kernel oops/panic and denial of service even without full exploitation." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/tipc/socket.c" ], "versions": [ { "version": "efa78f2ae363428525fb4981bb63c555ee79f3c7", "lessThan": "efebc23e9b29e3e5a9e2127dd066929f7f0d315e", "status": "affected", "versionType": "git" }, { "version": "833ecd0eae76eadf81d6d747bb5bc992d1151867", "lessThan": "8d6f26d48e61ef34f1921289401dbf36b10816af", "status": "affected", "versionType": "git" }, { "version": "00aff3590fc0a73bddd3b743863c14e76fd35c0c", "lessThan": "82f59aa27f33bd014a7d8739371ab5712d15e33b", "status": "affected", "versionType": "git" }, { "version": "00aff3590fc0a73bddd3b743863c14e76fd35c0c", "lessThan": "b07d87b31631edb6529e6cdcca790a7489d1250d", "status": "affected", "versionType": "git" }, { "version": "00aff3590fc0a73bddd3b743863c14e76fd35c0c", "lessThan": "dd29891ed840f6b8d020b759d0dc4a00b1d6e4ea", "status": "affected", "versionType": "git" }, { "version": "00aff3590fc0a73bddd3b743863c14e76fd35c0c", "lessThan": "5f5a41a48dbf9eda57b67ce23e548602cf7195a6", "status": "affected", "versionType": "git" }, { "version": "00aff3590fc0a73bddd3b743863c14e76fd35c0c", "lessThan": "f9596b1566616a8be0592dbceccb6344a7c6f6bb", "status": "affected", "versionType": "git" }, { "version": "00aff3590fc0a73bddd3b743863c14e76fd35c0c", "lessThan": "ba0533fc163f905fe817cfabdf8ed4058da44800", "status": "affected", "versionType": "git" }, { "version": "638fa20b618b2bbcf86da71231624cc82121a036", "status": "affected", "versionType": "git" }, { "version": "7bc9e7f70bc57d8f02ffea2a42094281effb15ef", "status": "affected", "versionType": "git" }, { "version": "ef488669b2652bde5b6ee5a409a5b048a2a50db4", "status": "affected", "versionType": "git" }, { "version": "4919d82f7041157a421ca9bf39a78551d5ad8a1b", "status": "affected", "versionType": "git" }, { "version": "3b2957fc09fe1ac7f07f40dd50dd5f93e3f3a7a2", "status": "affected", "versionType": "git" }, { "version": "5.10.132", "lessThan": "5.10.265", "status": "affected", "versionType": "semver" }, { "version": "5.15.56", "lessThan": "5.15.216", "status": "affected", "versionType": "semver" }, { "version": "4.9.324", "lessThan": "4.10", "status": "affected", "versionType": "semver" }, { "version": "4.14.289", "lessThan": "4.15", "status": "affected", "versionType": "semver" }, { "version": "4.19.253", "lessThan": "4.20", "status": "affected", "versionType": "semver" }, { "version": "5.4.207", "lessThan": "5.5", "status": "affected", "versionType": "semver" }, { "version": "5.18.13", "lessThan": "5.19", "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/tipc/socket.c" ], "versions": [ { "version": "5.19", "status": "affected" }, { "version": "0", "lessThan": "5.19", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.148", "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": "5.10.132", "versionEndExcluding": "5.10.265" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.56", "versionEndExcluding": "5.15.216" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.1.183" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.6.148" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.12.101" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.18.42" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "7.1.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "7.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9.324" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14.289" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19.253" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4.207" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.18.13" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/efebc23e9b29e3e5a9e2127dd066929f7f0d315e" }, { "url": "https://git.kernel.org/stable/c/8d6f26d48e61ef34f1921289401dbf36b10816af" }, { "url": "https://git.kernel.org/stable/c/82f59aa27f33bd014a7d8739371ab5712d15e33b" }, { "url": "https://git.kernel.org/stable/c/b07d87b31631edb6529e6cdcca790a7489d1250d" }, { "url": "https://git.kernel.org/stable/c/dd29891ed840f6b8d020b759d0dc4a00b1d6e4ea" }, { "url": "https://git.kernel.org/stable/c/5f5a41a48dbf9eda57b67ce23e548602cf7195a6" }, { "url": "https://git.kernel.org/stable/c/f9596b1566616a8be0592dbceccb6344a7c6f6bb" }, { "url": "https://git.kernel.org/stable/c/ba0533fc163f905fe817cfabdf8ed4058da44800" } ], "title": "tipc: clear sock->sk on the failed-insert path in tipc_sk_create()", "x_generator": { "engine": "bippy-1.2.0" } } } }