CVE-2024-40920: linux Use After Free
CVSS: 7.8v3.1HighModified
AliasesUBUNTU-CVE-2024-40920DEBIAN-CVE-2024-40920
Published 12-07-2024Last modified 05-08-2026
Vulnerability summary
CVE-2024-40920 is a high (CVSS 7.8) Use After Free vulnerability in linux. EPSS estimates a 0.42% chance of exploitation in the next 30 days, higher than 34.9% of scored vulnerabilities.
CVSS score
7.8/10
010
High · v3.1 (NVD)EPSS score
0.42%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 20 · Related 18DLA-4008-1DSA-5731-1SUSE-SU-2024:3194-1SUSE-SU-2024:3195-1SUSE-SU-2024:3383-1SUSE-SU-2025:0255-1SUSE-SU-2025:0262-1SUSE-SU-2025:0263-1SUSE-SU-2025:0265-1SUSE-SU-2025:0268-1SUSE-SU-2025:0269-1SUSE-SU-2025:20044-1SUSE-SU-2025:20047-1USN-6999-1USN-6999-2USN-7004-1USN-7005-1USN-7005-2USN-7008-1USN-7029-1
Timeline
- 12-07-2024PublishedVulnerability first disclosed.
- 05-08-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: net: bridge: mst: fix suspicious rcu usage in br_mst_set_state I converted br_mst_set_state to RCU to avoid a vlan use-after-free but forgot to change the vlan group dereference helper. Switch to vlan group RCU deref helper to fix the suspicious rcu usage warning.
CVSS metrics
4 scores · 4 sources · 1 versionHigh 7.8Preferred score · NVD (NIST)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HSources4 sources · 7.1–7.8
- CVE.orgCNA7.1HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:HDiffers
- OSV · UbuntuEcosystem advisory · calculated7.1HighCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:HDiffers
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.42%
Chance of exploitation in the next 30 days
Percentile
35%
Versus all other CVEs
30-day change
0.00 pp
From 0.42% on 21-09-2026
21-09-202621-10-2026
EPSS score0.42%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu84 products
- linux< 6.8.0-44.44
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 6.8.0-1015.16
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ 8ca9a750fc711911ef616ceb627d07357b04545e, < caaa2129784a04dcade0ea92c12e6ff90bbd23d8 | ≥ 4488617e5e995a09abe4d81add5fb165674edb59, < 7caefa2771722e65496d85b62e1dc4442b7d1345 | ≥ e43dd2b1ec746e105b7db5f9ad6ef14685a615a4, < 406bfc04b01ee47e4c626f77ecc7d9f85135b166 | ≥ 3a7c1661ae1383364cd6092d851f5e5da64d476b, < 546ceb1dfdac866648ec959cbc71d9525bd73462 | a2b01e65d9ba8af2bb086d3b7288ca53a07249ac | ≥ 6.8.12, < 6.9 | ≥ 6.1.93, < 6.1.95 | ≥ 6.6.33, < 6.6.35 | ≥ 6.9.3, < 6.9.6
- linux_kernel≥ 6.1.93, < 6.1.95 | ≥ 6.6.33, < 6.6.35 | ≥ 6.8.12, < 6.9 | ≥ 6.9.3, < 6.9.6 | 6.10:rc1 | 6.10:rc2 | 6.10:rc3
Debian1 product
- linux< 6.1.99-1 | < 6.9.7-1
3 vendors · 87 products
