In the Linux kernel, the following vulnerability has been resolved: tipc: prevent snt_unacked underflow on CONN_ACK tipc_sk_conn_proto_…
CVE-2026-74282 · published 15 Aug 2026
How serious is it
- Severity: high, CVSS score 7.5 out of 10.
- No exploit prediction (EPSS) score yet.
- Not on the CISA list of exploited vulnerabilities.
- No public exploit in Exploit-DB.
Is your app affected by CVE-2026-74282?
Paste this prompt into Claude Code, Cursor or any AI coding tool: it runs a free Shippable scan of your project and fixes what it finds. Built with Lovable, Bolt or v0? Scan your live app. Or upload your package file.
Who is affected
- Linux Linux: 4.7
How to check
- Find out whether you run the affected product and which version, then compare it with the versions above.
How to fix
Copies a prompt for Claude Code, Cursor or Codex that asks it to check whether you run this product.
- Apply the vendor's update or mitigation from the references below. If there is none yet, limit exposure of the affected service until there is.
- If a vulnerable version was live, check your logs and rotate the secrets that server could read.
The advisory
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.
Check your whole app
Dependencies are only half of it. Free and read-only: before you push, run npx shippable-dev scan localhost:3000 in your project folder, no account needed. For your live app, you prove it's yours with a one-line tag first.
References
- git.kernel.org/stable/c/1e2c956745777e6ffdee7f30da5935741c03ee1e
- git.kernel.org/stable/c/3388145d258cf2c4c98278e3987296007d30672e
- git.kernel.org/stable/c/3cfa3d8e0dc167850edeb5bf5a07757db83fd54e
- git.kernel.org/stable/c/47ed873e4ceda34098bd46d8e96b4bb13cad3a04
- git.kernel.org/stable/c/67e55b054bf8025658dc0e255057f2a6236416bd
- git.kernel.org/stable/c/96f91b8ae1a489b3eca137e7acf42cf985fb8939
- git.kernel.org/stable/c/ab3e10b44ba5411779aac7afd2477917dd77750f
- git.kernel.org/stable/c/b44bebdd32c9ff66ee2aebfc317ced44bedd9335
Merged from NVD. Last updated 23 Oct 2026. All vulnerabilities · RSS · JSON