CVE-2025-21763: linux Use After Free
CVSS: 7.8v3.1HighModified
AliasesUBUNTU-CVE-2025-21763DEBIAN-CVE-2025-21763
Published 27-02-2025Last modified 15-10-2026
Vulnerability summary
CVE-2025-21763 is a high (CVSS 7.8) Use After Free vulnerability in linux. EPSS estimates a 0.26% chance of exploitation in the next 30 days, higher than 17% of scored vulnerabilities.
CVSS score
7.8/10
010
High · v3.1 (CVE.org)EPSS score
0.26%
0%100%
Low · +0.01 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: neighbour: use RCU protection in __neigh_notify() __neigh_notify() 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:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:NSourcesSingle source
High 7.8Preferred score · CVE.org (CNA)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HSourcesAll 4 agree
- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- NVDNIST7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.26%
Chance of exploitation in the next 30 days
Percentile
17%
Versus all other CVEs
30-day change
+0.01 pp
From 0.26% on 20-09-2026
20-09-202620-10-2026
EPSS score0.26%
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≥ 426b5303eb435d98b9bee37a807be386bc2b3320, < e1aed6be381bcd7f46d4ca9d7ef0f5f3d6a1be32 | ≥ 426b5303eb435d98b9bee37a807be386bc2b3320, < 8666e9aab801328c1408a19fbf4070609dc0695a | ≥ 426b5303eb435d98b9bee37a807be386bc2b3320, < 40d8f2f2a373b6c294ffac394d2bb814b572ead1 | ≥ 426b5303eb435d98b9bee37a807be386bc2b3320, < 784eb2376270e086f7db136d154b8404edacf97b | ≥ 426b5303eb435d98b9bee37a807be386bc2b3320, < 1cbb2aa90cd3fba15ad7efb5cdda28f3d1082379 | ≥ 426b5303eb435d98b9bee37a807be386bc2b3320, < cdd5c2a12ddad8a77ce1838ff9f29aa587de82df | ≥ 426b5303eb435d98b9bee37a807be386bc2b3320, < 559307d25235e24b5424778c7332451b6c741159 | ≥ 426b5303eb435d98b9bee37a807be386bc2b3320, < becbd5850c03ed33b232083dd66c6e38c0c0e569 | 2.6.25
- linux_kernel≥ 2.6.25, < 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
