CVE-2026-43411 (GCVE-0-2026-43411)
Vulnerability from cvelistv5 – Published: 2026-05-08 14:21 – Updated: 2026-05-11 22:24
VLAI
Title
tipc: fix divide-by-zero in tipc_sk_filter_connect()
Summary
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)
Severity
No CVSS data available.
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
6787927475e52f6933e3affce365dabb2aa2fadf , < 600feb0a66a98c6b7f6f02b5f3612e75f9b8540f
(git)
Affected: 6787927475e52f6933e3affce365dabb2aa2fadf , < 3bc9998041076ee05d3f312a22cee6b2ca35527f (git) Affected: 6787927475e52f6933e3affce365dabb2aa2fadf , < 579956f9f297eb1b6a5d24de313f3acccee1f9d5 (git) Affected: 6787927475e52f6933e3affce365dabb2aa2fadf , < a360d3815aae1f00dd71b7714a846482e85cc1f7 (git) Affected: 6787927475e52f6933e3affce365dabb2aa2fadf , < c2ebfbe63deb7bfd4dc2532bae62a7ed67713272 (git) Affected: 6787927475e52f6933e3affce365dabb2aa2fadf , < 2754e7b3d64748643df867d1ea6fec522914b635 (git) Affected: 6787927475e52f6933e3affce365dabb2aa2fadf , < 338c5edeb6ae3f12a4b84dff9d71f6f7f8c202c3 (git) Affected: 6787927475e52f6933e3affce365dabb2aa2fadf , < 6c5a9baa15de240e747263aba435a0951da8d8d2 (git) |
|
| Linux | Linux |
Affected:
4.20
Unaffected: 0 , < 4.20 (semver) Unaffected: 5.10.253 , ≤ 5.10.* (semver) Unaffected: 5.15.203 , ≤ 5.15.* (semver) Unaffected: 6.1.167 , ≤ 6.1.* (semver) Unaffected: 6.6.130 , ≤ 6.6.* (semver) Unaffected: 6.12.78 , ≤ 6.12.* (semver) Unaffected: 6.18.19 , ≤ 6.18.* (semver) Unaffected: 6.19.9 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix) |
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"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-\u003econn_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)"
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}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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