7.8

CVE-2025-21761: linux Use After Free

CVSS: 7.8v3.1HighModified
AliasesUBUNTU-CVE-2025-21761DEBIAN-CVE-2025-21761
Published 27-02-2025Last modified 15-10-2026
Open JSON

Vulnerability summary

CVE-2025-21761 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.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.26%
0%100%
Low · +0.02 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 57 · Related 55
DLA-4102-1DLA-4178-1RHSA-2025:20095SUSE-SU-2025:01919-1SUSE-SU-2025:01951-1SUSE-SU-2025:01967-1

Timeline

  1. 27-02-2025
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: openvswitch: use RCU protection in ovs_vport_cmd_fill_info() ovs_vport_cmd_fill_info() can be called without RTNL or RCU. Use RCU protection and dev_net_rcu() to avoid potential UAF.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.26%

Chance of exploitation in the next 30 days

Percentile

17%

Versus all other CVEs

30-day change

+0.02 pp

From 0.24% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.26%

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

Ubuntu136 products
  • linux< 4.15.0-245.257 | < 5.4.0-216.236 | < 5.15.0-140.150 | < 6.8.0-78.78
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 4.15.0-1187.200 | < 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≥ 9354d452034273a50a4fd703bea31e5d6b1fc20b, < e85a25d1a9985645e796039e843d1de581d2de1e | ≥ 9354d452034273a50a4fd703bea31e5d6b1fc20b, < a8816b3f1f151373fd30f1996f00480126c8bb11 | ≥ 9354d452034273a50a4fd703bea31e5d6b1fc20b, < a884f57600e463f69d7b279c4598b865260b62a1 | ≥ 9354d452034273a50a4fd703bea31e5d6b1fc20b, < 7e01abc34e87abd091e619161a20f54ed4e3e2da | ≥ 9354d452034273a50a4fd703bea31e5d6b1fc20b, < 8ec57509c36c8b9a23e50b7858dda0c520a2d074 | ≥ 9354d452034273a50a4fd703bea31e5d6b1fc20b, < a849a10de5e04d798f7f286a2f1ca174719a617a | ≥ 9354d452034273a50a4fd703bea31e5d6b1fc20b, < 5828937742af74666192835d657095d95c53dbd0 | ≥ 9354d452034273a50a4fd703bea31e5d6b1fc20b, < 90b2f49a502fa71090d9f4fe29a2f51fe5dff76d | 4.15
  • linux_kernel≥ 4.15, < 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 · 139 products

References

62 links
Show all 62 references