CVE-2025-21762: linux Use After Free
CVSS: 8.1v3.1HighModified
AliasesUBUNTU-CVE-2025-21762DEBIAN-CVE-2025-21762
Published 27-02-2025Last modified 15-10-2026
Vulnerability summary
CVE-2025-21762 is a high (CVSS 8.1) Use After Free vulnerability in linux. EPSS estimates a 0.66% chance of exploitation in the next 30 days, higher than 50.6% of scored vulnerabilities.
CVSS score
8.1/10
010
High · v3.1 (CVE.org)EPSS score
0.66%
0%100%
Low · +0.04 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 51 · Related 50DLA-4102-1DLA-4178-1SUSE-SU-2025:01919-1SUSE-SU-2025:01951-1SUSE-SU-2025:01967-1SUSE-SU-2025:1177-1SUSE-SU-2025:1178-1SUSE-SU-2025:1180-1SUSE-SU-2025:1293-1SUSE-SU-2025:20190-1SUSE-SU-2025:20192-1SUSE-SU-2025:20260-1SUSE-SU-2025:20270-1USN-7510-1USN-7510-2USN-7510-3USN-7510-4USN-7510-5USN-7510-6USN-7510-7USN-7510-8USN-7511-1USN-7511-2USN-7511-3USN-7512-1USN-7516-1USN-7516-2USN-7516-3USN-7516-4USN-7516-5USN-7516-6USN-7516-7USN-7516-8USN-7516-9USN-7517-1USN-7517-2USN-7517-3USN-7518-1USN-7521-1USN-7521-3USN-7539-1USN-7540-1USN-7593-1USN-7602-1USN-7640-1USN-7703-1USN-7703-2USN-7703-3USN-7703-4USN-7719-1USN-7737-1USN-7521-2
Timeline
- 27-02-2025PublishedVulnerability first disclosed.
- 15-10-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: arp: use RCU protection in arp_xmit() arp_xmit() can be called without RTNL or RCU protection. Use RCU protection to avoid potential UAF.
CVSS metrics
5 scores · 4 sources · 2 versionsHigh 7.3Preferred score · OSV · Ubuntu (Ecosystem advisory) · calculated from vector
CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:NSourcesSingle source
High 8.1Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:HSourcesAll 4 agree
- OSV · UbuntuEcosystem advisory · calculated8.1HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated8.1HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
- NVDNIST8.1HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.66%
Chance of exploitation in the next 30 days
Percentile
51%
Versus all other CVEs
30-day change
+0.04 pp
From 0.62% on 19-09-2026
19-09-202619-10-2026
EPSS score0.66%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu137 products
- linuxAll versions (No fix recorded) | < 5.4.0-216.236 | < 5.15.0-140.150 | < 6.8.0-78.78
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 5.4.0-1146.156 | < 5.15.0-1084.91 | < 6.8.0-1035.37
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ 29a26a56803855a79dbd028cd61abee56237d6e5, < 10f555e3f573d004ae9d89b3276abb58c4ede5c3 | ≥ 29a26a56803855a79dbd028cd61abee56237d6e5, < 307cd1e2d3cb1cbc6c40c679cada6d7168b18431 | ≥ 29a26a56803855a79dbd028cd61abee56237d6e5, < d9366ac2f956a1948b68c0500f84a3462ff2ed8a | ≥ 29a26a56803855a79dbd028cd61abee56237d6e5, < f189654459423d4d48bef2d120b4bfba559e6039 | ≥ 29a26a56803855a79dbd028cd61abee56237d6e5, < e9f4dee534eb1b225b0a120395ad9bc2afe164d3 | ≥ 29a26a56803855a79dbd028cd61abee56237d6e5, < 01d1b5c9abcaff29a43f1d17a19c33eec92c7dbe | ≥ 29a26a56803855a79dbd028cd61abee56237d6e5, < 2c331718d3389b6c5f6855078ab7171849e016bd | ≥ 29a26a56803855a79dbd028cd61abee56237d6e5, < a42b69f692165ec39db42d595f4f65a4c8f42e44 | 4.4
- linux_kernel≥ 4.4, < 5.4.291 | ≥ 5.5, < 5.10.235 | ≥ 5.11, < 5.15.179 | ≥ 5.16, < 6.1.129 | ≥ 6.2, < 6.6.79 | ≥ 6.7, < 6.12.16 | ≥ 6.13, < 6.13.4 | 6.14:rc1 | 6.14:rc2
Debian1 product
- linux< 6.1.129-1 | < 6.12.16-1
3 vendors · 140 products
