Medium 5.5Published May 8, 2026

CVE-2026-43411tipc: fix divide-by-zero in tipc_sk_filter_connect()

Updated under an hour ago (Oct 28, 2026, 4:20 AM ET)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: tipc: fix divide-by-zero in tipc_sk_filter_connect() A user can set conn_timeout to any value via setsockopt(TIPC_CONN_TIMEOUT), including values less than 4. When a SYN is rejected with TIPC_ERR_OVERLOAD and the retry path in tipc_sk_filter_connect() executes: delay %= (tsk->conn_timeout / 4); If conn_timeout is in the range [0, 3], the integer division yields 0, and the modulo operation triggers a divide-by-zero exception, causing a kernel oops/panic. Fix this by clamping conn_timeout to a minimum of 4 at the point of use in tipc_sk_filter_connect(). Oops: divide error: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 119 Comm: poc-F144 Not tainted 7.0.0-rc2+ RIP: 0010:tipc_sk_filter_rcv (net/tipc/socket.c:2236 net/tipc/socket.c:2362) Call Trace: 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) __release_sock (include/net/sock.h:1185 net/core/sock.c:3213) release_sock (net/core/sock.c:3797) tipc_connect (net/tipc/socket.c:2570) __sys_connect (include/linux/file.h:62 include/linux/file.h:83 net/socket.c:2098)

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: May 11, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	6787927475e52f6933e3affce365dabb2aa2fadf builds before 600feb0a66a98c6b7f6f02b5f3612e75f9b8540f; 6787927475e52f6933e3affce365dabb2aa2fadf builds before 3bc9998041076ee05d3f312a22cee6b2ca35527f; 6787927475e52f6933e3affce365dabb2aa2fadf builds before 579956f9f297eb1b6a5d24de313f3acccee1f9d5; from 6787927475e52f6933e3affce365dabb2aa2fadf before a360d3815aae1f00dd71b7714a846482e85cc1f7; from 6787927475e52f6933e3affce365dabb2aa2fadf before c2ebfbe63deb7bfd4dc2532bae62a7ed67713272; 6787927475e52f6933e3affce365dabb2aa2fadf builds before 2754e7b3d64748643df867d1ea6fec522914b635; 6787927475e52f6933e3affce365dabb2aa2fadf builds before 338c5edeb6ae3f12a4b84dff9d71f6f7f8c202c3; 6787927475e52f6933e3affce365dabb2aa2fadf builds before 6c5a9baa15de240e747263aba435a0951da8d8d2	CNA record
linux linux_kernel linux:linux_kernel	from 4.20 before 5.10.253; from 5.11 before 5.15.203; from 5.16 before 6.1.167; from 6.2 before 6.6.130; from 6.7 before 6.12.78; from 6.13 before 6.18.19; from 6.19 before 6.19.9; 7.0; and 2 more ranges	NVD

References

References

https://git.kernel.org/stable/c/600feb0a66a98c6b7f6f02b5f3612e75f9b8540f	patch
https://git.kernel.org/stable/c/3bc9998041076ee05d3f312a22cee6b2ca35527f	patch
https://git.kernel.org/stable/c/579956f9f297eb1b6a5d24de313f3acccee1f9d5	patch
https://git.kernel.org/stable/c/a360d3815aae1f00dd71b7714a846482e85cc1f7	patch
https://git.kernel.org/stable/c/c2ebfbe63deb7bfd4dc2532bae62a7ed67713272	patch
https://git.kernel.org/stable/c/2754e7b3d64748643df867d1ea6fec522914b635	patch
https://git.kernel.org/stable/c/338c5edeb6ae3f12a4b84dff9d71f6f7f8c202c3	patch
https://git.kernel.org/stable/c/6c5a9baa15de240e747263aba435a0951da8d8d2	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.