7.5

CVE-2025-71269: btrfs: do not free data reservation in fallback from inline due to -ENOSPC

Modified
AliasesUBUNTU-CVE-2025-71269DEBIAN-CVE-2025-71269
Published 18-03-2026Last modified 19-10-2026

Vulnerability summary

CVE-2025-71269 is a high (CVSS 7.5) Use After Free vulnerability in linux. EPSS estimates a 0.23% chance of exploitation in the next 30 days, higher than 13.6% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 7.5 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 0% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.23%
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 19 · Related 19
SUSE-SU-2026:1573-1SUSE-SU-2026:21114-1SUSE-SU-2026:21123-1SUSE-SU-2026:21255-1SUSE-SU-2026:21834-1USN-8567-1

Timeline

  1. 18-03-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: btrfs: do not free data reservation in fallback from inline due to -ENOSPC If we fail to create an inline extent due to -ENOSPC, we will attempt to go through the normal COW path, reserve an extent, create an ordered extent, etc. However we were always freeing the reserved qgroup data, which is wrong since we will use data. Fix this by freeing the reserved qgroup data in __cow_file_range_inline() only if we are not doing the fallback (ret is <= 0).

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.23%

Chance of exploitation in the next 30 days

Percentile

14%

Versus all other CVEs

30-day change

Increase +0.01 pp

From 0.22% 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: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu157 products
  • linuxAll versions (No fix recorded) | < 6.8.0-136.136
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 6.8.0-1061.64
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 94ed938aba557aa798acf496f09afb289b619fcd, < 3edd1f6c7c520536b62b2904807033597554dbac | ≥ 94ed938aba557aa798acf496f09afb289b619fcd, < 3a9fd45afadec1fbfec72057b9473d509fa8b68c | ≥ 94ed938aba557aa798acf496f09afb289b619fcd, < 0a1fbbd780f04d1b6cf48dd327c866ba937de1c4 | ≥ 94ed938aba557aa798acf496f09afb289b619fcd, < 6de3a371a8b9fd095198b1aa68c22cc10a4c6961 | ≥ 94ed938aba557aa798acf496f09afb289b619fcd, < f8da41de0bff9eb1d774a7253da0c9f637c4470a | 4.4
  • linux_kernel≥ 4.4, < 6.1.168 | ≥ 6.2, < 6.6.134 | ≥ 6.7, < 6.12.81 | ≥ 6.13, < 6.18.10 | 6.19:rc1 | 6.19:rc2 | 6.19:rc3 | 6.19:rc4
Debian1 product
  • linux< 6.1.170-1 | < 6.12.85-1 | < 6.18.10-1

3 vendors · 160 products

References

24 links
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