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CVE-2026-74282

tipc: prevent snt_unacked underflow on CONN_ACK

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: yes
  • Technical impact: partial

Summary

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

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: yes · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux Linux

    From 10724cc7bb7832b482df049c20fd824d928c5eaa · fixed in 3388145d258cf2c4c98278e3987296007d30672e; From 10724cc7bb7832b482df049c20fd824d928c5eaa · fixed in 67e55b054bf8025658dc0e255057f2a6236416bd; From 10724cc7bb7832b482df049c20fd824d928c5eaa · fixed in 96f91b8ae1a489b3eca137e7acf42cf985fb8939; From 10724cc7bb7832b482df049c20fd824d928c5eaa · fixed in 47ed873e4ceda34098bd46d8e96b4bb13cad3a04; From 10724cc7bb7832b482df049c20fd824d928c5eaa · fixed in b44bebdd32c9ff66ee2aebfc317ced44bedd9335; From 10724cc7bb7832b482df049c20fd824d928c5eaa · fixed in 3cfa3d8e0dc167850edeb5bf5a07757db83fd54e; From 10724cc7bb7832b482df049c20fd824d928c5eaa · fixed in 1e2c956745777e6ffdee7f30da5935741c03ee1e; From 10724cc7bb7832b482df049c20fd824d928c5eaa · fixed in ab3e10b44ba5411779aac7afd2477917dd77750f

  • Linux Linux

    4.7

  • KernelLinux

    From 4.7.0 · fixed in 5.10.261; From 5.11.0 · fixed in 5.15.212; From 5.16.0 · fixed in 6.1.178; From 6.2.0 · fixed in 6.6.145; From 6.7.0 · fixed in 6.12.97; From 6.13.0 · fixed in 6.18.40; From 6.19.0 · fixed in 7.1.5

References 8

git.kernel.org