CVE-2025-21760: linux Use After Free
CVSS: 8.1v3.1HighModified
AliasesUBUNTU-CVE-2025-21760DEBIAN-CVE-2025-21760
Published 27-02-2025Last modified 15-10-2026
Vulnerability summary
CVE-2025-21760 is a high (CVSS 8.1) Use After Free vulnerability in linux. EPSS estimates a 38.00% chance of exploitation in the next 30 days, higher than 98.5% of scored vulnerabilities.
CVSS score
8.1/10
010
High · v3.1 (CVE.org)EPSS score
38.00%
0%100%
High · +1.15 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 57 · Related 56DLA-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-2025:20270-1SUSE-SU-2026:0474-1SUSE-SU-2026:0475-1SUSE-SU-2026:0495-1SUSE-SU-2026:0496-1SUSE-SU-2026:0617-1SUSE-SU-2026:1131-1USN-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: ndisc: extend RCU protection in ndisc_send_skb() ndisc_send_skb() can be called without RTNL or RCU held. Acquire rcu_read_lock() earlier, so that we can use dev_net_rcu() and avoid a 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 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
38.00%
Chance of exploitation in the next 30 days
Percentile
99%
Versus all other CVEs
30-day change
+1.15 pp
From 36.85% on 18-09-2026
18-09-202618-10-2026
EPSS score38.00%
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≥ 1762f7e88eb34f653b4a915be99a102e347dd45e, < 10a1f3fece2f0d23a3a618b72b2b4e6f408ef7d1 | ≥ 1762f7e88eb34f653b4a915be99a102e347dd45e, < 4d576202b90b1b95a7c428a80b536f91b8201bcc | ≥ 1762f7e88eb34f653b4a915be99a102e347dd45e, < e24d225e4cb8cf108bde00b76594499b98f0a74d | ≥ 1762f7e88eb34f653b4a915be99a102e347dd45e, < a9319d800b5701e7f5e3fa71a5b7c4831fc20d6d | ≥ 1762f7e88eb34f653b4a915be99a102e347dd45e, < ae38982f521621c216fc2f5182cd091f4734641d | ≥ 1762f7e88eb34f653b4a915be99a102e347dd45e, < 789230e5a8c1097301afc802e242c79bc8835c67 | ≥ 1762f7e88eb34f653b4a915be99a102e347dd45e, < 04e05112f10354ffc3bb6cc796d553bab161594c | ≥ 1762f7e88eb34f653b4a915be99a102e347dd45e, < ed6ae1f325d3c43966ec1b62ac1459e2b8e45640 | 2.6.26
- linux_kernel≥ 2.6.26, < 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
