8.8

CVE-2026-43018: linux Use After Free

CVSS: 8.8v3.1HighModified
AliasesUBUNTU-CVE-2026-43018DEBIAN-CVE-2026-43018
Published 01-05-2026Last modified 19-10-2026
Open JSON

Vulnerability summary

CVE-2026-43018 is a high (CVSS 8.8) Use After Free vulnerability in linux. EPSS estimates a 0.40% chance of exploitation in the next 30 days, higher than 33.3% 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
0.40%
0%100%
Low · +0.15 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 28 · Related 26
MGASA-2026-0108MGASA-2026-0110OPENSUSE-SU-2026:21555-1SUSE-SU-2026:23066-1SUSE-SU-2026:23068-1SUSE-SU-2026:23193-1

Timeline

  1. 01-05-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_event: fix potential UAF in hci_le_remote_conn_param_req_evt hci_conn lookup and field access must be covered by hdev lock in hci_le_remote_conn_param_req_evt, otherwise it's possible it is freed concurrently. Extend the hci_dev_lock critical section to cover all conn usage.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.40%

Chance of exploitation in the next 30 days

Percentile

33%

Versus all other CVEs

30-day change

+0.15 pp

From 0.26% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.40%

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

Affected systems

Ubuntu130 products
  • linux< 6.8.0-136.136 | All versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 6.8.0-1061.64 | All versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 95118dd4edfec950898a00180c6f998df0a6406d, < 59eecf0ffde15670e6a5e10c47be67f73d843b20 | ≥ 95118dd4edfec950898a00180c6f998df0a6406d, < 5fb69e1eeea9d6cba80517e9f058b56b34bc3a81 | ≥ 95118dd4edfec950898a00180c6f998df0a6406d, < 7cadb03be37e761130edb153544fe0770a842b19 | ≥ 95118dd4edfec950898a00180c6f998df0a6406d, < 1d0bdbfe3e91c11f0a704c52443a9446a10d699c | ≥ 95118dd4edfec950898a00180c6f998df0a6406d, < ea3cd36d7382d5f8309df04c275d20df139ed42c | ≥ 95118dd4edfec950898a00180c6f998df0a6406d, < b255531b27da336571411248c2a72a350662bd09 | 5.17
  • linux_kernel≥ 5.17, < 6.1.168 | ≥ 6.2, < 6.6.134 | ≥ 6.7, < 6.12.81 | ≥ 6.13, < 6.18.22 | ≥ 6.19, < 6.19.12 | 7.0:rc1 | 7.0:rc2 | 7.0:rc3 | 7.0:rc4 | 7.0:rc5 | 7.0:rc6
Debian1 product
  • linux< 6.1.170-1 | < 6.12.85-1 | < 6.19.12-1

3 vendors · 133 products

References

24 links
Show all 24 references