CVE-2026-74282tipc: prevent snt_unacked underflow on CONN_ACK
- 7.5HighCVSS base score
- 0.70%Exploitation in 30 daysEPSS · top 46% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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.
Timeline
ID reserved
By Linux
Published
- 2 months later
· 2 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
| NVDNVD · Received | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.70% · top 46% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: yes · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
- affected 10724cc7bb7832b482df049c20fd824d928c5eaa – < 3388145d258cf2c4c98278e3987296007d30672e
- affected 10724cc7bb7832b482df049c20fd824d928c5eaa – < 67e55b054bf8025658dc0e255057f2a6236416bd
- affected 10724cc7bb7832b482df049c20fd824d928c5eaa – < 96f91b8ae1a489b3eca137e7acf42cf985fb8939
- affected 10724cc7bb7832b482df049c20fd824d928c5eaa – < 47ed873e4ceda34098bd46d8e96b4bb13cad3a04
- affected 10724cc7bb7832b482df049c20fd824d928c5eaa – < b44bebdd32c9ff66ee2aebfc317ced44bedd9335
- affected 10724cc7bb7832b482df049c20fd824d928c5eaa – < 3cfa3d8e0dc167850edeb5bf5a07757db83fd54e
- affected 10724cc7bb7832b482df049c20fd824d928c5eaa – < 1e2c956745777e6ffdee7f30da5935741c03ee1e
- affected 10724cc7bb7832b482df049c20fd824d928c5eaa – < ab3e10b44ba5411779aac7afd2477917dd77750f
- affected 4.7
- unaffected < 4.7
- unaffected 5.10.261 – ≤ 5.10.*
- unaffected 5.15.212 – ≤ 5.15.*
- unaffected 6.1.178 – ≤ 6.1.*
- unaffected 6.6.145 – ≤ 6.6.*
- unaffected 6.12.97 – ≤ 6.12.*
- unaffected 6.18.40 – ≤ 6.18.*
- unaffected 7.1.5 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References8
- https://git.kernel.org/stable/c/3388145d258cf2c4c98278e3987296007d30672e (opens in a new tab)
- https://git.kernel.org/stable/c/67e55b054bf8025658dc0e255057f2a6236416bd (opens in a new tab)
- https://git.kernel.org/stable/c/96f91b8ae1a489b3eca137e7acf42cf985fb8939 (opens in a new tab)
- https://git.kernel.org/stable/c/47ed873e4ceda34098bd46d8e96b4bb13cad3a04 (opens in a new tab)
- https://git.kernel.org/stable/c/b44bebdd32c9ff66ee2aebfc317ced44bedd9335 (opens in a new tab)
- https://git.kernel.org/stable/c/3cfa3d8e0dc167850edeb5bf5a07757db83fd54e (opens in a new tab)
- https://git.kernel.org/stable/c/1e2c956745777e6ffdee7f30da5935741c03ee1e (opens in a new tab)
- https://git.kernel.org/stable/c/ab3e10b44ba5411779aac7afd2477917dd77750f (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-59429 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-74282)Record last updated .