VulnerabilityPublished 19 Jul 2026Updated 21 Oct 2026

CVE-2026-64146: Linux kernel · erofs: fix metabuf leak in inode xattr initialization

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in fcb23bb31508b62e8a1b32adf6217820e90e29b0 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 14:05 UTC

Severity

Unrated

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

EPSS: 0.1% chance of exploitation in 30 days – higher than 2% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in fcb23bb31508b62e8a1b32adf6217820e90e29b0, e4a552e0b6413c1af2e140b5bc14bb849b411b57, 3812cfe6cb0a5988df4fedcdaf9aab677b9cca61 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 19 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: 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 26 Oct 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.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, 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 ≥ bb88e8da00253bea0e7f0f4cdfd7910572d7799f, < fcb23bb31508b62e8a1b32adf6217820e90e29b0	Fixed in fcb23bb31508b62e8a1b32adf6217820e90e29b0
LinuxLinux	Affected ≥ bb88e8da00253bea0e7f0f4cdfd7910572d7799f, < e4a552e0b6413c1af2e140b5bc14bb849b411b57	Fixed in e4a552e0b6413c1af2e140b5bc14bb849b411b57
LinuxLinux	Affected ≥ bb88e8da00253bea0e7f0f4cdfd7910572d7799f, < 3812cfe6cb0a5988df4fedcdaf9aab677b9cca61	Fixed in 3812cfe6cb0a5988df4fedcdaf9aab677b9cca61
LinuxLinux	Affected ≥ bb88e8da00253bea0e7f0f4cdfd7910572d7799f, < 492c73b21fefa36f3869cb2b188ffb7fe37b3a9b	Fixed in 492c73b21fefa36f3869cb2b188ffb7fe37b3a9b
LinuxLinux	Affected ≥ bb88e8da00253bea0e7f0f4cdfd7910572d7799f, < 79b09c54c6563df9846ca3094bcfd72082c3e1d7	Fixed in 79b09c54c6563df9846ca3094bcfd72082c3e1d7
LinuxLinux	Affected =5.17	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: erofs: fix metabuf leak in inode xattr initialization commit bb88e8da0025 ("erofs: use meta buffers for xattr operations") converted xattr operations to use on-stack erofs_buf instances. erofs_init_inode_xattrs() uses such a metabuf while reading the inline xattr header and shared xattr id array. Some error paths after erofs_read_metabuf() leave through out_unlock without dropping the metabuf, so the folio reference can leak. Consolidate the cleanup at out_unlock. erofs_put_metabuf() is a no-op if no folio has been acquired, and this keeps all paths after taking EROFS_I_BL_XATTR_BIT covered by a single cleanup site.

References

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