7.5

CVE-2025-21676: linux NULL Pointer Dereference

CVSS: 7.5v3.1HighModified
AliasesUBUNTU-CVE-2025-21676DEBIAN-CVE-2025-21676
Published 31-01-2025Last modified 15-10-2026
Open JSON

Vulnerability summary

CVE-2025-21676 is a high (CVSS 7.5) NULL Pointer Dereference vulnerability in linux. EPSS estimates a 0.45% chance of exploitation in the next 30 days, higher than 37.6% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.45%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 18 · Related 18
SUSE-SU-2025:0428-1SUSE-SU-2025:0499-1SUSE-SU-2025:0557-1SUSE-SU-2025:0564-1SUSE-SU-2025:20165-1SUSE-SU-2025:20166-1

Timeline

  1. 31-01-2025
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: net: fec: handle page_pool_dev_alloc_pages error The fec_enet_update_cbd function calls page_pool_dev_alloc_pages but did not handle the case when it returned NULL. There was a WARN_ON(!new_page) but it would still proceed to use the NULL pointer and then crash. This case does seem somewhat rare but when the system is under memory pressure it can happen. One case where I can duplicate this with some frequency is when writing over a smbd share to a SATA HDD attached to an imx6q. Setting /proc/sys/vm/min_free_kbytes to higher values also seems to solve the problem for my test case. But it still seems wrong that the fec driver ignores the memory allocation error and can crash. This commit handles the allocation error by dropping the current packet.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.45%

Chance of exploitation in the next 30 days

Percentile

38%

Versus all other CVEs

30-day change

+0.01 pp

From 0.44% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.45%

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

Ubuntu106 products
  • linux< 6.8.0-62.65
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 6.8.0-1030.32
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 95698ff6177b5f1f13f251da60e7348413046ae4, < eacdcc14f3c8d4c1447565521e792ddb3a67e08d | ≥ 95698ff6177b5f1f13f251da60e7348413046ae4, < 8a0097db0544b658c159ac787319737712063a23 | ≥ 95698ff6177b5f1f13f251da60e7348413046ae4, < 1425cb829556398f594658512d49292f988a2ab0 | ≥ 95698ff6177b5f1f13f251da60e7348413046ae4, < 001ba0902046cb6c352494df610718c0763e77a5 | 6.1
  • linux_kernel≥ 6.1, < 6.6.74 | ≥ 6.7, < 6.12.11 | 6.13:rc1 | 6.13:rc2 | 6.13:rc3 | 6.13:rc4 | 6.13:rc5 | 6.13:rc6 | 6.13:rc7
Debian1 product
  • linux< 6.1.170-1 | < 6.12.11-1

3 vendors · 109 products

References

22 links
Show all 22 references