8.8

CVE-2026-74540: linux

CVSS: 8.8v3.1HighReceived
AliasesUBUNTU-CVE-2026-74540DEBIAN-CVE-2026-74540
Published 15-08-2026Last modified 16-10-2026
Open JSON

Vulnerability summary

CVE-2026-74540 is a high (CVSS 8.8) vulnerability in linux. EPSS estimates a 0.26% chance of exploitation in the next 30 days, higher than 16.1% 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
0.26%
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 17 · Related 17
SUSE-SU-2026:24181-1SUSE-SU-2026:24182-1SUSE-SU-2026:4640-1SUSE-SU-2026:4660-1SUSE-SU-2026:4665-1SUSE-SU-2026:4666-1

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: Bluetooth: L2CAP: fix UAF in l2cap_le_connect_rsp l2cap_le_connect_rsp() obtains a channel via __l2cap_get_chan_by_ident() but neither holds a reference nor uses l2cap_chan_hold_unless_zero() before locking and operating on it. A concurrent l2cap_chan_del() triggered by a remote disconnect can free the channel between the lookup and l2cap_chan_lock(), causing a use-after-free. The BR/EDR counterpart l2cap_connect_rsp() and the sibling handler l2cap_le_command_rej() already use l2cap_chan_hold_unless_zero() to safely hold a reference, but l2cap_le_connect_rsp() was left unprotected. Fix by adding l2cap_chan_hold_unless_zero() after the ident lookup and l2cap_chan_put() on the exit path, consistent with other L2CAP response handlers.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.26%

Chance of exploitation in the next 30 days

Percentile

16%

Versus all other CVEs

30-day change

0.00 pp

From 0.26% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.26%

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

Ubuntu169 products
  • linuxAll versions (No fix recorded) | < 5.15.0-198.208
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linux< 6.1.187-1 | < 6.12.105-1 | < 7.1.8-1
  • linux-6.12< 6.12.107-1~deb12u1
Linux1 product
  • linux≥ f1496dee9cbde2a62821f4441dadb0d3360f60c3, < 15d6c2367217a6a20b1abae9f38ded716bf620f1 | ≥ f1496dee9cbde2a62821f4441dadb0d3360f60c3, < 1818180fe12d6cec7a437bc59cde8efdf6b10250 | ≥ f1496dee9cbde2a62821f4441dadb0d3360f60c3, < 8325eafb38c3dee5af329266393763693d17381b | ≥ f1496dee9cbde2a62821f4441dadb0d3360f60c3, < fd4c1e301bdec60a40728ea37de531cbccda501a | ≥ f1496dee9cbde2a62821f4441dadb0d3360f60c3, < 522b730c62c53a1981604fd73524697fd347830d | ≥ f1496dee9cbde2a62821f4441dadb0d3360f60c3, < 58e3c5289ad230a7e24ae4b0c7b43f5ee6e32136 | ≥ f1496dee9cbde2a62821f4441dadb0d3360f60c3, < 09f447accc2570751e7d17f0dc0788b40d3edade | ≥ f1496dee9cbde2a62821f4441dadb0d3360f60c3, < c4740e7f23ff9a8210198d8b4703259e21b9f69d | 3.14

3 vendors · 172 products

References

20 links
Show all 20 references