7.5

CVE-2026-74282: linux

CVSS: 7.5v3.1HighReceived
AliasesUBUNTU-CVE-2026-74282DEBIAN-CVE-2026-74282
Published 15-08-2026Last modified 16-10-2026
Open JSON

Vulnerability summary

CVE-2026-74282 is a high (CVSS 7.5) vulnerability in linux. EPSS estimates a 0.70% chance of exploitation in the next 30 days, higher than 52.4% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.70%
0%100%
Low · +0.02 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 25 · Related 25
OPENSUSE-SU-2026:21910-1SUSE-SU-2026:23881-1SUSE-SU-2026:23887-1SUSE-SU-2026:23897-1SUSE-SU-2026:23902-1SUSE-SU-2026:24181-1

Timeline

  1. 15-08-2026
    PublishedVulnerability first disclosed.
  2. 16-10-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.70%

Chance of exploitation in the next 30 days

Percentile

52%

Versus all other CVEs

30-day change

+0.02 pp

From 0.68% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.70%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu168 products
  • linuxAll versions (No fix recorded) | < 5.15.0-198.208 | < 6.8.0-147.147 | < 7.0.0-38.38
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124 | < 6.8.0-1067.70 | < 7.0.0-1014.14
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linux< 6.1.180-1 | < 6.12.100-1 | < 7.1.5-1
Linux1 product
  • linux≥ 10724cc7bb7832b482df049c20fd824d928c5eaa, < 3388145d258cf2c4c98278e3987296007d30672e | ≥ 10724cc7bb7832b482df049c20fd824d928c5eaa, < 67e55b054bf8025658dc0e255057f2a6236416bd | ≥ 10724cc7bb7832b482df049c20fd824d928c5eaa, < 96f91b8ae1a489b3eca137e7acf42cf985fb8939 | ≥ 10724cc7bb7832b482df049c20fd824d928c5eaa, < 47ed873e4ceda34098bd46d8e96b4bb13cad3a04 | ≥ 10724cc7bb7832b482df049c20fd824d928c5eaa, < b44bebdd32c9ff66ee2aebfc317ced44bedd9335 | ≥ 10724cc7bb7832b482df049c20fd824d928c5eaa, < 3cfa3d8e0dc167850edeb5bf5a07757db83fd54e | ≥ 10724cc7bb7832b482df049c20fd824d928c5eaa, < 1e2c956745777e6ffdee7f30da5935741c03ee1e | ≥ 10724cc7bb7832b482df049c20fd824d928c5eaa, < ab3e10b44ba5411779aac7afd2477917dd77750f | 4.7

3 vendors · 170 products

References

27 links
Show all 27 references