VulnerabilityPublished 14 Feb 2026Updated 5 Nov 2026

CVE-2026-23141: Linux kernel · btrfs: send: check for inline extents in range_is_hole_in_parent()

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in f2dc6ab3a14c2d2eb0b14783427eb9b03bf631c9 : 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 f2dc6ab3a14c2d2eb0b14783427eb9b03bf631c9, db00636643e66898d79f2530ac9c56ebd5eca369, d948055bd46a9c14d1d4217aed65c5c258c32903 +3

Exploitation evidence

Disclosed: evidence found.
CVE published 14 Feb 2026
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 ≥ 82bfb2e7b645c8f228dc3b6d3b27b0b10125ca4f, < f2dc6ab3a14c2d2eb0b14783427eb9b03bf631c9	Fixed in f2dc6ab3a14c2d2eb0b14783427eb9b03bf631c9
LinuxLinux	Affected ≥ 82bfb2e7b645c8f228dc3b6d3b27b0b10125ca4f, < db00636643e66898d79f2530ac9c56ebd5eca369	Fixed in db00636643e66898d79f2530ac9c56ebd5eca369
LinuxLinux	Affected ≥ 82bfb2e7b645c8f228dc3b6d3b27b0b10125ca4f, < d948055bd46a9c14d1d4217aed65c5c258c32903	Fixed in d948055bd46a9c14d1d4217aed65c5c258c32903
LinuxLinux	Affected ≥ 82bfb2e7b645c8f228dc3b6d3b27b0b10125ca4f, < 901e581bfc44d181f7d9c3f11880dac3e89deb2e	Fixed in 901e581bfc44d181f7d9c3f11880dac3e89deb2e
LinuxLinux	Affected ≥ 82bfb2e7b645c8f228dc3b6d3b27b0b10125ca4f, < 39f83f10772310ba4a77f2b5256aaf36994ef7e8	Fixed in 39f83f10772310ba4a77f2b5256aaf36994ef7e8
LinuxLinux	Affected ≥ 82bfb2e7b645c8f228dc3b6d3b27b0b10125ca4f, < 08b096c1372cd69627f4f559fb47c9fb67a52b39	Fixed in 08b096c1372cd69627f4f559fb47c9fb67a52b39

Description

In the Linux kernel, the following vulnerability has been resolved: btrfs: send: check for inline extents in range_is_hole_in_parent() Before accessing the disk_bytenr field of a file extent item we need to check if we are dealing with an inline extent. This is because for inline extents their data starts at the offset of the disk_bytenr field. So accessing the disk_bytenr means we are accessing inline data or in case the inline data is less than 8 bytes we can actually cause an invalid memory access if this inline extent item is the first item in the leaf or access metadata from other items.

References

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