{"id":"CVE-2026-43411","state":"PUBLISHED","title":"tipc: fix divide-by-zero in tipc_sk_filter_connect()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: fix divide-by-zero in tipc_sk_filter_connect()\n\nA user can set conn_timeout to any value via\nsetsockopt(TIPC_CONN_TIMEOUT), including values less than 4.  When a\nSYN is rejected with TIPC_ERR_OVERLOAD and the retry path in\ntipc_sk_filter_connect() executes:\n\n    delay %= (tsk->conn_timeout / 4);\n\nIf conn_timeout is in the range [0, 3], the integer division yields 0,\nand the modulo operation triggers a divide-by-zero exception, causing a\nkernel oops/panic.\n\nFix this by clamping conn_timeout to a minimum of 4 at the point of use\nin tipc_sk_filter_connect().\n\nOops: divide error: 0000 [#1] SMP KASAN NOPTI\nCPU: 0 UID: 0 PID: 119 Comm: poc-F144 Not tainted 7.0.0-rc2+\nRIP: 0010:tipc_sk_filter_rcv (net/tipc/socket.c:2236 net/tipc/socket.c:2362)\nCall Trace:\n tipc_sk_backlog_rcv (include/linux/instrumented.h:82 include/linux/atomic/atomic-instrumented.h:32 include/net/sock.h:2357 net/tipc/socket.c:2406)\n __release_sock (include/net/sock.h:1185 net/core/sock.c:3213)\n release_sock (net/core/sock.c:3797)\n tipc_connect (net/tipc/socket.c:2570)\n __sys_connect (include/linux/file.h:62 include/linux/file.h:83 net/socket.c:2098)","publishedAt":"2026-05-08T14:21:49.543Z","updatedAt":"2026-05-11T22:24:04.295Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"6787927475e52f6933e3affce365dabb2aa2fadf","status":"affected","lessThan":"600feb0a66a98c6b7f6f02b5f3612e75f9b8540f","versionType":"git"},{"version":"6787927475e52f6933e3affce365dabb2aa2fadf","status":"affected","lessThan":"3bc9998041076ee05d3f312a22cee6b2ca35527f","versionType":"git"},{"version":"6787927475e52f6933e3affce365dabb2aa2fadf","status":"affected","lessThan":"579956f9f297eb1b6a5d24de313f3acccee1f9d5","versionType":"git"},{"version":"6787927475e52f6933e3affce365dabb2aa2fadf","status":"affected","lessThan":"a360d3815aae1f00dd71b7714a846482e85cc1f7","versionType":"git"},{"version":"6787927475e52f6933e3affce365dabb2aa2fadf","status":"affected","lessThan":"c2ebfbe63deb7bfd4dc2532bae62a7ed67713272","versionType":"git"},{"version":"6787927475e52f6933e3affce365dabb2aa2fadf","status":"affected","lessThan":"2754e7b3d64748643df867d1ea6fec522914b635","versionType":"git"},{"version":"6787927475e52f6933e3affce365dabb2aa2fadf","status":"affected","lessThan":"338c5edeb6ae3f12a4b84dff9d71f6f7f8c202c3","versionType":"git"},{"version":"6787927475e52f6933e3affce365dabb2aa2fadf","status":"affected","lessThan":"6c5a9baa15de240e747263aba435a0951da8d8d2","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/tipc/socket.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.20","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.20","versionType":"semver"},{"version":"5.10.253","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.167","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.130","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.78","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.19","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.9","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/tipc/socket.c"]}],"references":["https://git.kernel.org/stable/c/600feb0a66a98c6b7f6f02b5f3612e75f9b8540f","https://git.kernel.org/stable/c/3bc9998041076ee05d3f312a22cee6b2ca35527f","https://git.kernel.org/stable/c/579956f9f297eb1b6a5d24de313f3acccee1f9d5","https://git.kernel.org/stable/c/a360d3815aae1f00dd71b7714a846482e85cc1f7","https://git.kernel.org/stable/c/c2ebfbe63deb7bfd4dc2532bae62a7ed67713272","https://git.kernel.org/stable/c/2754e7b3d64748643df867d1ea6fec522914b635","https://git.kernel.org/stable/c/338c5edeb6ae3f12a4b84dff9d71f6f7f8c202c3","https://git.kernel.org/stable/c/6c5a9baa15de240e747263aba435a0951da8d8d2"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:57.932Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/43xxx/CVE-2026-43411.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43411","state":"PUBLISHED","datePublished":"2026-05-08T14:21:49.543Z","dateUpdated":"2026-05-11T22:24:04.295Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-01T14:12:56.008Z"},"containers":{"cna":{"title":"tipc: fix divide-by-zero in tipc_sk_filter_connect()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: fix divide-by-zero in tipc_sk_filter_connect()\n\nA user can set conn_timeout to any value via\nsetsockopt(TIPC_CONN_TIMEOUT), including values less than 4.  When a\nSYN is rejected with TIPC_ERR_OVERLOAD and the retry path in\ntipc_sk_filter_connect() executes:\n\n    delay %= (tsk->conn_timeout / 4);\n\nIf conn_timeout is in the range [0, 3], the integer division yields 0,\nand the modulo operation triggers a divide-by-zero exception, causing a\nkernel oops/panic.\n\nFix this by clamping conn_timeout to a minimum of 4 at the point of use\nin tipc_sk_filter_connect().\n\nOops: divide error: 0000 [#1] SMP KASAN NOPTI\nCPU: 0 UID: 0 PID: 119 Comm: poc-F144 Not tainted 7.0.0-rc2+\nRIP: 0010:tipc_sk_filter_rcv (net/tipc/socket.c:2236 net/tipc/socket.c:2362)\nCall Trace:\n tipc_sk_backlog_rcv (include/linux/instrumented.h:82 include/linux/atomic/atomic-instrumented.h:32 include/net/sock.h:2357 net/tipc/socket.c:2406)\n __release_sock (include/net/sock.h:1185 net/core/sock.c:3213)\n release_sock (net/core/sock.c:3797)\n tipc_connect (net/tipc/socket.c:2570)\n __sys_connect (include/linux/file.h:62 include/linux/file.h:83 net/socket.c:2098)"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"6787927475e52f6933e3affce365dabb2aa2fadf","status":"affected","lessThan":"600feb0a66a98c6b7f6f02b5f3612e75f9b8540f","versionType":"git"},{"version":"6787927475e52f6933e3affce365dabb2aa2fadf","status":"affected","lessThan":"3bc9998041076ee05d3f312a22cee6b2ca35527f","versionType":"git"},{"version":"6787927475e52f6933e3affce365dabb2aa2fadf","status":"affected","lessThan":"579956f9f297eb1b6a5d24de313f3acccee1f9d5","versionType":"git"},{"version":"6787927475e52f6933e3affce365dabb2aa2fadf","status":"affected","lessThan":"a360d3815aae1f00dd71b7714a846482e85cc1f7","versionType":"git"},{"version":"6787927475e52f6933e3affce365dabb2aa2fadf","status":"affected","lessThan":"c2ebfbe63deb7bfd4dc2532bae62a7ed67713272","versionType":"git"},{"version":"6787927475e52f6933e3affce365dabb2aa2fadf","status":"affected","lessThan":"2754e7b3d64748643df867d1ea6fec522914b635","versionType":"git"},{"version":"6787927475e52f6933e3affce365dabb2aa2fadf","status":"affected","lessThan":"338c5edeb6ae3f12a4b84dff9d71f6f7f8c202c3","versionType":"git"},{"version":"6787927475e52f6933e3affce365dabb2aa2fadf","status":"affected","lessThan":"6c5a9baa15de240e747263aba435a0951da8d8d2","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/tipc/socket.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.20","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.20","versionType":"semver"},{"version":"5.10.253","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.167","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.130","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.78","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.19","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.9","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/tipc/socket.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/600feb0a66a98c6b7f6f02b5f3612e75f9b8540f"},{"url":"https://git.kernel.org/stable/c/3bc9998041076ee05d3f312a22cee6b2ca35527f"},{"url":"https://git.kernel.org/stable/c/579956f9f297eb1b6a5d24de313f3acccee1f9d5"},{"url":"https://git.kernel.org/stable/c/a360d3815aae1f00dd71b7714a846482e85cc1f7"},{"url":"https://git.kernel.org/stable/c/c2ebfbe63deb7bfd4dc2532bae62a7ed67713272"},{"url":"https://git.kernel.org/stable/c/2754e7b3d64748643df867d1ea6fec522914b635"},{"url":"https://git.kernel.org/stable/c/338c5edeb6ae3f12a4b84dff9d71f6f7f8c202c3"},{"url":"https://git.kernel.org/stable/c/6c5a9baa15de240e747263aba435a0951da8d8d2"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T22:24:04.295Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"5.10.253"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"5.15.203"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"6.1.167"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"6.6.130"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"6.12.78"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"6.18.19"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"6.19.9"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}