CVE-2026-74282tipc: prevent snt_unacked underflow on CONN_ACK
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: tipc: prevent snt_unacked underflow on CONN_ACK tipc_sk_conn_proto_rcv() subtracts the peer-supplied connection ack count from the unsigned 16-bit send counter snt_unacked without checking that it does not exceed the number of messages actually outstanding: tsk->snt_unacked -= msg_conn_ack(hdr); msg_conn_ack() is read straight from a received CONN_MANAGER/CONN_ACK message. If the ack count is larger than snt_unacked, the subtraction wraps to a near-maximum value, leaving tsk_conn_cong() permanently true and starving the connection of further transmits. Validate the ACK count at the start of the CONN_ACK block and drop the message if it acknowledges more messages than are outstanding. A peer (or, for a local connection, the connected peer socket) can otherwise wedge a TIPC connection's send side by sending an oversized connection ack.
- CVSS
- 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/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
- Received
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 10724cc7bb7832b482df049c20fd824d928c5eaa before 3388145d258cf2c4c98278e3987296007d30672e; 10724cc7bb7832b482df049c20fd824d928c5eaa builds before 67e55b054bf8025658dc0e255057f2a6236416bd; 10724cc7bb7832b482df049c20fd824d928c5eaa builds before 96f91b8ae1a489b3eca137e7acf42cf985fb8939; 10724cc7bb7832b482df049c20fd824d928c5eaa builds before 47ed873e4ceda34098bd46d8e96b4bb13cad3a04; from 10724cc7bb7832b482df049c20fd824d928c5eaa before b44bebdd32c9ff66ee2aebfc317ced44bedd9335; 10724cc7bb7832b482df049c20fd824d928c5eaa builds before 3cfa3d8e0dc167850edeb5bf5a07757db83fd54e; 10724cc7bb7832b482df049c20fd824d928c5eaa builds before 1e2c956745777e6ffdee7f30da5935741c03ee1e; from 10724cc7bb7832b482df049c20fd824d928c5eaa before ab3e10b44ba5411779aac7afd2477917dd77750f | CNA record |
References
- https://git.kernel.org/stable/c/3388145d258cf2c4c98278e3987296007d30672e
- https://git.kernel.org/stable/c/67e55b054bf8025658dc0e255057f2a6236416bd
- https://git.kernel.org/stable/c/96f91b8ae1a489b3eca137e7acf42cf985fb8939
- https://git.kernel.org/stable/c/47ed873e4ceda34098bd46d8e96b4bb13cad3a04
- https://git.kernel.org/stable/c/b44bebdd32c9ff66ee2aebfc317ced44bedd9335
- https://git.kernel.org/stable/c/3cfa3d8e0dc167850edeb5bf5a07757db83fd54e
- https://git.kernel.org/stable/c/1e2c956745777e6ffdee7f30da5935741c03ee1e
- https://git.kernel.org/stable/c/ab3e10b44ba5411779aac7afd2477917dd77750f
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.