VulnerabilityPublished 8 May 2026Updated 6 Nov 2026

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

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in c2ebfbe63deb7bfd4dc2532bae62a7ed67713272 : update Linux kernel when convenient.

Data as of 6 Nov 2026, 15:49 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch

Available – fixed in c2ebfbe63deb7bfd4dc2532bae62a7ed67713272, a360d3815aae1f00dd71b7714a846482e85cc1f7, 579956f9f297eb1b6a5d24de313f3acccee1f9d5 +5

Exploitation evidence

Disclosed: evidence found.
CVE published 8 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 6787927475e52f6933e3affce365dabb2aa2fadf, < c2ebfbe63deb7bfd4dc2532bae62a7ed67713272	Fixed in c2ebfbe63deb7bfd4dc2532bae62a7ed67713272
LinuxLinux	Affected ≥ 6787927475e52f6933e3affce365dabb2aa2fadf, < a360d3815aae1f00dd71b7714a846482e85cc1f7	Fixed in a360d3815aae1f00dd71b7714a846482e85cc1f7
LinuxLinux	Affected ≥ 6787927475e52f6933e3affce365dabb2aa2fadf, < 579956f9f297eb1b6a5d24de313f3acccee1f9d5	Fixed in 579956f9f297eb1b6a5d24de313f3acccee1f9d5
LinuxLinux	Affected ≥ 6787927475e52f6933e3affce365dabb2aa2fadf, < 2754e7b3d64748643df867d1ea6fec522914b635	Fixed in 2754e7b3d64748643df867d1ea6fec522914b635
LinuxLinux	Affected ≥ 6787927475e52f6933e3affce365dabb2aa2fadf, < 600feb0a66a98c6b7f6f02b5f3612e75f9b8540f	Fixed in 600feb0a66a98c6b7f6f02b5f3612e75f9b8540f
LinuxLinux	Affected ≥ 6787927475e52f6933e3affce365dabb2aa2fadf, < 338c5edeb6ae3f12a4b84dff9d71f6f7f8c202c3	Fixed in 338c5edeb6ae3f12a4b84dff9d71f6f7f8c202c3

Description

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)

References

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