8.8

CVE-2026-74537: linux

CVSS: 8.8v3.1HighReceived
AliasesUBUNTU-CVE-2026-74537DEBIAN-CVE-2026-74537
Published 15-08-2026Last modified 21-10-2026
Open JSON

Vulnerability summary

CVE-2026-74537 is a high (CVSS 8.8) vulnerability in linux. EPSS estimates a 0.24% chance of exploitation in the next 30 days, higher than 14.1% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.24%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 18 · Related 18
OPENSUSE-SU-2026:21910-1SUSE-SU-2026:23477-1SUSE-SU-2026:23481-1SUSE-SU-2026:23528-1SUSE-SU-2026:23529-1SUSE-SU-2026:23881-1

Timeline

  1. 15-08-2026
    PublishedVulnerability first disclosed.
  2. 21-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: hold sk properly in iso_conn_ready sk deref in iso_conn_ready must be done either under conn->lock, or holding a refcount, to avoid concurrent close. conn->sk is currently accessed without either: [Task 1] [Task 2] iso_sock_release iso_conn_ready sk = conn->sk lock_sock(sk) conn->sk = NULL lock_sock(sk) release_sock(sk) iso_sock_kill(sk) UAF on sk deref Fix possible UAF by holding sk refcount in iso_conn_ready(). Also recheck after lock_sock that the socket is still valid. Adjust locking so conn->sk is cleared only under lock_sock.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.24%

Chance of exploitation in the next 30 days

Percentile

14%

Versus all other CVEs

30-day change

0.00 pp

From 0.24% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.24%

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

Ubuntu157 products
  • linuxAll versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linuxAll versions (No fix recorded) | < 7.1.8-1
Linux1 product
  • linux≥ 27c24fda62b601d6f9ca5e992502578c4310876f, < 44590dc53c9e949d2fed399a571a89c3d7d0b245 | ≥ 27c24fda62b601d6f9ca5e992502578c4310876f, < 99b65f0ea3370c13687ff870330c425b6ca44e89 | ≥ 27c24fda62b601d6f9ca5e992502578c4310876f, < 4e9b5e8669b3602a4e01b6d1e9539b72e42c84d5 | ≥ 27c24fda62b601d6f9ca5e992502578c4310876f, < 1308d72903d792d10b82bc4ef08b8a4452308b04 | ≥ 27c24fda62b601d6f9ca5e992502578c4310876f, < 0d255e63fcf3f13a570d7ac11678fa1164ac015c | 5.15

3 vendors · 159 products

References

10 links