{"id":"CVE-2026-43411","title":"tipc: fix divide-by-zero in tipc_sk_filter_connect()","summary":"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\n…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 6787927475e52f6933e3affce365dabb2aa2fadf < 600feb0a66a98c6b7f6f02b5f3612e75f9b8540f","Linux >= 6787927475e52f6933e3affce365dabb2aa2fadf < 3bc9998041076ee05d3f312a22cee6b2ca35527f","Linux >= 6787927475e52f6933e3affce365dabb2aa2fadf < 579956f9f297eb1b6a5d24de313f3acccee1f9d5","Linux >= 6787927475e52f6933e3affce365dabb2aa2fadf < a360d3815aae1f00dd71b7714a846482e85cc1f7","Linux >= 6787927475e52f6933e3affce365dabb2aa2fadf < c2ebfbe63deb7bfd4dc2532bae62a7ed67713272","Linux >= 6787927475e52f6933e3affce365dabb2aa2fadf < 2754e7b3d64748643df867d1ea6fec522914b635","Linux >= 6787927475e52f6933e3affce365dabb2aa2fadf < 338c5edeb6ae3f12a4b84dff9d71f6f7f8c202c3","Linux >= 6787927475e52f6933e3affce365dabb2aa2fadf < 6c5a9baa15de240e747263aba435a0951da8d8d2","Linux 4.20"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T15:37:36.437553Z"},"published":"2026-05-08","updated":"2026-11-06","sourceUpdated":"2026-11-06T15:42:52.283Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-43411","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"}],"tags":["cve.org"],"epss":0.00123,"epssPercentile":0.02051,"ingestedAt":"2026-11-06T15:54:03.924Z","slug":"CVE-2026-43411","body":"## Overview\n\nIn 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)\n\n## Affected\n\n- `Linux >= 6787927475e52f6933e3affce365dabb2aa2fadf < 600feb0a66a98c6b7f6f02b5f3612e75f9b8540f`\n- `Linux >= 6787927475e52f6933e3affce365dabb2aa2fadf < 3bc9998041076ee05d3f312a22cee6b2ca35527f`\n- `Linux >= 6787927475e52f6933e3affce365dabb2aa2fadf < 579956f9f297eb1b6a5d24de313f3acccee1f9d5`\n- `Linux >= 6787927475e52f6933e3affce365dabb2aa2fadf < a360d3815aae1f00dd71b7714a846482e85cc1f7`\n- `Linux >= 6787927475e52f6933e3affce365dabb2aa2fadf < c2ebfbe63deb7bfd4dc2532bae62a7ed67713272`\n- `Linux >= 6787927475e52f6933e3affce365dabb2aa2fadf < 2754e7b3d64748643df867d1ea6fec522914b635`\n- `Linux >= 6787927475e52f6933e3affce365dabb2aa2fadf < 338c5edeb6ae3f12a4b84dff9d71f6f7f8c202c3`\n- `Linux >= 6787927475e52f6933e3affce365dabb2aa2fadf < 6c5a9baa15de240e747263aba435a0951da8d8d2`\n- `Linux 4.20`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}