7.8

CVE-2025-21764: ndisc: use RCU protection in ndisc_alloc_skb()

Modified
AliasesRHSA-2025:9490RHSA-2025:9491RHSA-2025:9492
Published 27-02-2025Last modified 15-10-2026

Vulnerability summary

CVE-2025-21764 is a high (CVSS 7.8) Use After Free vulnerability in linux. EPSS estimates a 0.27% chance of exploitation in the next 30 days, higher than 19.3% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.27%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 67 · Related 56
DLA-4102-1DLA-4178-1RHSA-2025:10211RHSA-2025:8333RHSA-2025:9079RHSA-2025:9493

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: ndisc: use RCU protection in ndisc_alloc_skb() ndisc_alloc_skb() can be called without RTNL or RCU being held. Add RCU protection to avoid possible UAF.

CVSS metrics

6 scores · 5 sources · 2 versions

EPSS trend

Probability

0.27%

Chance of exploitation in the next 30 days

Percentile

19%

Versus all other CVEs

30-day change

Increase +0.01 pp

From 0.26% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

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)
Redhat60 products
  • bpftool< 0:4.18.0-193.154.1.el8_2 | < 0:7.0.0-284.121.1.el9_2
  • bpftool-debuginfo< 0:4.18.0-193.154.1.el8_2 | < 0:7.0.0-284.121.1.el9_2
  • kernel< 0:4.18.0-193.154.1.el8_2 | < 0:5.14.0-284.121.1.el9_2
  • kernel-64k< 0:5.14.0-284.121.1.el9_2
  • kernel-64k-core< 0:5.14.0-284.121.1.el9_2
Linux2 products
  • linux≥ de09334b9326632bbf1a74bfd8b01866cbbf2f61, < 96fc896d0e5b37c12808df797397fb16f3080879 | ≥ de09334b9326632bbf1a74bfd8b01866cbbf2f61, < c30893ef3d9cde8e7e8e4fd06b53d2c935bbccb1 | ≥ de09334b9326632bbf1a74bfd8b01866cbbf2f61, < b870256dd2a5648d5ed2f22316b3ac29a7e5ed63 | ≥ de09334b9326632bbf1a74bfd8b01866cbbf2f61, < 3c2d705f5adf5d860aaef90cb4211c0fde2ba66d | ≥ de09334b9326632bbf1a74bfd8b01866cbbf2f61, < 9e0ec817eb41a55327a46cd3ce331a9868d60304 | ≥ de09334b9326632bbf1a74bfd8b01866cbbf2f61, < bbec88e4108e8d6fb468d3817fa652140a44ff28 | ≥ de09334b9326632bbf1a74bfd8b01866cbbf2f61, < cd1065f92eb7ff21b9ba5308a86f33d1670bf926 | ≥ de09334b9326632bbf1a74bfd8b01866cbbf2f61, < 628e6d18930bbd21f2d4562228afe27694f66da9 | 3.9
  • linux_kernel≥ 3.9, < 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

4 vendors · 200 products · Showing 200 of 216

References

68 links
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