CVE-2025-68820: ext4: xattr: fix null pointer deref in ext4_raw_inode()

Deferred
AliasesUBUNTU-CVE-2025-68820DEBIAN-CVE-2025-68820
Published 13-01-2026Last modified 19-10-2026

Vulnerability summary

CVE-2025-68820 is a NULL Pointer Dereference vulnerability in linux with no CVSS score yet. EPSS estimates a 0.24% chance of exploitation in the next 30 days, higher than 14.4% of scored vulnerabilities.

Priority
Insufficient evidence

No CVSS vector published; no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
Not scored
010
No CVSS score recorded
EPSS score
0.24%
0%100%
Low · +0.03 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 46 · Related 42
DLA-4475-1DLA-4476-1DSA-6126-1DSA-6127-1MGASA-2026-0017MGASA-2026-0018

Timeline

  1. 13-01-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ext4: xattr: fix null pointer deref in ext4_raw_inode() If ext4_get_inode_loc() fails (e.g. if it returns -EFSCORRUPTED), iloc.bh will remain set to NULL. Since ext4_xattr_inode_dec_ref_all() lacks error checking, this will lead to a null pointer dereference in ext4_raw_inode(), called right after ext4_get_inode_loc(). Found by Linux Verification Center (linuxtesting.org) with SVACE.

CVSS metrics

Risk metrics not yet published.

EPSS trend

Probability

0.24%

Chance of exploitation in the next 30 days

Percentile

14%

Versus all other CVEs

30-day change

Increase +0.03 pp

From 0.21% 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: not stated in public data.

Ubuntu143 products
  • linux< 5.15.0-173.183 | < 6.8.0-110.110 | < 6.17.0-22.22
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.15.0-1103.110 | < 6.8.0-1052.55 | < 6.17.0-1012.12
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linux< 6.1.162-1 | < 6.12.69-1 | < 6.18.3-1
Linux1 product
  • linux≥ 76c365fa7e2a8bb85f0190cdb4b8cdc99b2fdce3, < b72a3476f0c97d02f63a6e9fff127348d55436f6 | ≥ f737418b6de31c962c7192777ee4018906975383, < 3d8d22e75f7edfa0b30ff27330fd6a1285d594c3 | ≥ cf9291a3449b04688b81e32621e88de8f4314b54, < 190ad0f22ba49f1101182b80e3af50ca2ddfe72f | ≥ 362a90cecd36e8a5c415966d0b75b04a0270e4dd, < b5d942922182e82724b7152cb998f540132885ec | ≥ eb59cc31b6ea076021d14b04e7faab1636b87d0e, < 5b154e901fda2e98570b8f426a481f5740097dc2 | ≥ c8e008b60492cf6fd31ef127aea6d02fd3d314cd, < ce5f54c065a4a7cbb92787f4f140917112350142 | ≥ c8e008b60492cf6fd31ef127aea6d02fd3d314cd, < b97cb7d6a051aa6ebd57906df0e26e9e36c26d14 | 6aff941cb0f7d0c897c3698ad2e30672709135e3 | 3bc6317033f365ce578eb6039445fb66162722fd | 836e625b03a666cf93ff5be328c8cb30336db872 | ≥ 5.10.237, < 5.10.248 | ≥ 5.15.181, < 5.15.198 | ≥ 6.1.135, < 6.1.160 | ≥ 6.6.88, < 6.6.120 | ≥ 6.12.24, < 6.12.64 | ≥ 5.4.293, < 5.5 | ≥ 6.13.12, < 6.14 | ≥ 6.14.3, < 6.15 | 6.15

3 vendors · 145 products

References

43 links
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