VulnerabilityPublished 4 Sep 2025Updated 5 Nov 2026

CVE-2025-38701: Linux kernel · ext4: do not BUG when INLINE_DATA_FL lacks system.data xattr

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in d960f4b793912f35e9d72bd9d1e90553063fcbf1 : update Linux kernel when convenient.

Data as of 5 Nov 2026, 21:34 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-05.

Patch

Available – fixed in d960f4b793912f35e9d72bd9d1e90553063fcbf1, 8085a7324d8ec448c4a764af7853e19bbd64e17a, 2817ac83cb4732597bf36853fe13ca616f4ee4e2 +6

Exploitation evidence

Disclosed: evidence found.
CVE published 4 Sep 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 67cf5b09a46f72e048501b84996f2f77bc42e947, < d960f4b793912f35e9d72bd9d1e90553063fcbf1	Fixed in d960f4b793912f35e9d72bd9d1e90553063fcbf1
LinuxLinux	Affected ≥ 67cf5b09a46f72e048501b84996f2f77bc42e947, < 8085a7324d8ec448c4a764af7853e19bbd64e17a	Fixed in 8085a7324d8ec448c4a764af7853e19bbd64e17a
LinuxLinux	Affected ≥ 67cf5b09a46f72e048501b84996f2f77bc42e947, < 2817ac83cb4732597bf36853fe13ca616f4ee4e2	Fixed in 2817ac83cb4732597bf36853fe13ca616f4ee4e2
LinuxLinux	Affected ≥ 67cf5b09a46f72e048501b84996f2f77bc42e947, < 1199a6399895f4767f0b9a68a6ff47c3f799b7c7	Fixed in 1199a6399895f4767f0b9a68a6ff47c3f799b7c7
LinuxLinux	Affected ≥ 67cf5b09a46f72e048501b84996f2f77bc42e947, < 279c87ef7b9da34f65c2e4db586e730b667a6fb9	Fixed in 279c87ef7b9da34f65c2e4db586e730b667a6fb9
LinuxLinux	Affected ≥ 67cf5b09a46f72e048501b84996f2f77bc42e947, < 099b847ccc6c1ad2f805d13cfbcc83f5b6d4bc42	Fixed in 099b847ccc6c1ad2f805d13cfbcc83f5b6d4bc42

Description

In the Linux kernel, the following vulnerability has been resolved: ext4: do not BUG when INLINE_DATA_FL lacks system.data xattr A syzbot fuzzed image triggered a BUG_ON in ext4_update_inline_data() when an inode had the INLINE_DATA_FL flag set but was missing the system.data extended attribute. Since this can happen due to a maiciouly fuzzed file system, we shouldn't BUG, but rather, report it as a corrupted file system. Add similar replacements of BUG_ON with EXT4_ERROR_INODE() ii ext4_create_inline_data() and ext4_inline_data_truncate().

References

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