7.1

CVE-2025-21638: linux NULL Pointer Dereference

CVSS: 7.1v3.1HighModified
AliasesUBUNTU-CVE-2025-21638DEBIAN-CVE-2025-21638
Published 19-01-2025Last modified 15-10-2026
Open JSON

Vulnerability summary

CVE-2025-21638 is a high (CVSS 7.1) NULL Pointer Dereference vulnerability in linux. EPSS estimates a 0.24% chance of exploitation in the next 30 days, higher than 13.8% of scored vulnerabilities.

Overall risk
28/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.1/10
010
High · v3.1 (CVE.org)
EPSS score
0.24%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 50 · Related 47
DLA-4075-1DLA-4076-1DSA-5860-1MGASA-2025-0030MGASA-2025-0032SUSE-SU-2025:0784-1

Timeline

  1. 19-01-2025
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: sctp: sysctl: auth_enable: avoid using current->nsproxy As mentioned in a previous commit of this series, using the 'net' structure via 'current' is not recommended for different reasons: - Inconsistency: getting info from the reader's/writer's netns vs only from the opener's netns. - current->nsproxy can be NULL in some cases, resulting in an 'Oops' (null-ptr-deref), e.g. when the current task is exiting, as spotted by syzbot [1] using acct(2). The 'net' structure can be obtained from the table->data using container_of(). Note that table->data could also be used directly, but that would increase the size of this fix, while 'sctp.ctl_sock' still needs to be retrieved from 'net' structure.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.24%

Chance of exploitation in the next 30 days

Percentile

14%

Versus all other CVEs

30-day change

0.00 pp

From 0.24% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.24%

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

Ubuntu135 products
  • linuxAll versions (No fix recorded) | < 5.4.0-211.231 | < 5.15.0-135.146 | < 6.8.0-60.63
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.4.0-1142.152 | < 5.15.0-1080.87 | < 6.8.0-1029.31
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ b14878ccb7fac0242db82720b784ab62c467c0dc, < cf387cdebfaebae228dfba162f94c567a67610c3 | ≥ b14878ccb7fac0242db82720b784ab62c467c0dc, < dc583e7e5f8515ca489c0df28e4362a70eade382 | ≥ b14878ccb7fac0242db82720b784ab62c467c0dc, < bd2a2939423566c654545fa3e96a656662a0af9e | ≥ b14878ccb7fac0242db82720b784ab62c467c0dc, < 1b67030d39f2b00f94ac1f0af11ba6657589e4d3 | ≥ b14878ccb7fac0242db82720b784ab62c467c0dc, < 7ec30c54f339c640aa7e49d7e9f7bbed6bd42bf6 | ≥ b14878ccb7fac0242db82720b784ab62c467c0dc, < c184bc621e3cef03ac9ba81a50dda2dae6a21d36 | ≥ b14878ccb7fac0242db82720b784ab62c467c0dc, < 15649fd5415eda664ef35780c2013adeb5d9c695 | e5eae4a0511241959498b180fa0df0d4f1b11b9c | 88830f227a1f96e44d82ddfcb0cc81d517ec6dd8 | 3938b0336a93fa5faa242dc9e5823ac69df9e066 | ≥ 3.10.41, < 3.11 | ≥ 3.12.21, < 3.13 | ≥ 3.14.5, < 3.15 | 3.15
  • linux_kernel≥ 3.10.41, < 3.11 | ≥ 3.12.20, < 3.13 | ≥ 3.14.5, < 5.4.290 | ≥ 5.5, < 5.10.234 | ≥ 5.11, < 5.15.177 | ≥ 5.16, < 6.1.125 | ≥ 6.2, < 6.6.72 | ≥ 6.7, < 6.12.10 | 6.13:rc1 | 6.13:rc2 | 6.13:rc3 | 6.13:rc4 | 6.13:rc5 | 6.13:rc6
Debian1 product
  • linux< 6.1.128-1 | < 6.12.10-1

3 vendors · 138 products

References

53 links
Show all 53 references