Strix
58.1K

CVE-2026-74282

HIGHCVSS 7.5/10EPSS 0.21%

Last modified

CVE-2026-74282 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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. EPSS estimates a 0.21% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability
0.21%

11.6th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 10724cc7bb7832b482df049c20fd824d928c5eaa, < 3388145d258cf2c4c98278e3987296007d30672e; >= 10724cc7bb7832b482df049c20fd824d928c5eaa, < 67e55b054bf8025658dc0e255057f2a6236416bd; >= 10724cc7bb7832b482df049c20fd824d928c5eaa, < 96f91b8ae1a489b3eca137e7acf42cf985fb8939; >= 10724cc7bb7832b482df049c20fd824d928c5eaa, < 47ed873e4ceda34098bd46d8e96b4bb13cad3a04; >= 10724cc7bb7832b482df049c20fd824d928c5eaa, < b44bebdd32c9ff66ee2aebfc317ced44bedd9335; >= 10724cc7bb7832b482df049c20fd824d928c5eaa, < 3cfa3d8e0dc167850edeb5bf5a07757db83fd54e; >= 10724cc7bb7832b482df049c20fd824d928c5eaa, < 1e2c956745777e6ffdee7f30da5935741c03ee1e; >= 10724cc7bb7832b482df049c20fd824d928c5eaa, < ab3e10b44ba5411779aac7afd2477917dd77750f
LinuxLinux4.7

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-74282?
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.
How severe is CVE-2026-74282?
CVE-2026-74282 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 0.21% probability of exploitation in the next 30 days.
How do I fix CVE-2026-74282?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

How Strix Helps

Related CVEs from 2026

View all 2026CVEs →

Are you affected by CVE-2026-74282?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST