VulnerabilityPublished 23 Oct 2026

CVE-2026-98907: Linux kernel · btrfs: protect sb_write_pointer() with invalidate lock

Source GCVE Database

Authoritative record:CVE-2026-98907

Not known to be exploited : upgrade to 123b9a545f4d0348e81f558a032bf2a93ee5722f or 80cd97c5e90096d040a623851795eac92fbd0ff1 when convenient.

Data as of 26 Oct 2026, 13:47 UTC

Severity

Medium

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 123b9a545f4d0348e81f558a032bf2a93ee5722f, 80cd97c5e90096d040a623851795eac92fbd0ff1

Exploitation evidence

Disclosed: evidence found.
CVE published 23 Oct 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.

ghsa-2r98-r7qj-j43v

What to do

Upgrade Linux kernel to 123b9a545f4d0348e81f558a032bf2a93ee5722f or 80cd97c5e90096d040a623851795eac92fbd0ff1.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 3c20917120ce61f2a123ca0810293872f4c6b5a4, < 123b9a545f4d0348e81f558a032bf2a93ee5722f	Fixed in 123b9a545f4d0348e81f558a032bf2a93ee5722f
LinuxLinux	Affected ≥ 3c20917120ce61f2a123ca0810293872f4c6b5a4, < 80cd97c5e90096d040a623851795eac92fbd0ff1	Fixed in 80cd97c5e90096d040a623851795eac92fbd0ff1
LinuxLinux	Affected =6.15	Fixed in–

AI-suggested

A fix has been implemented in the Linux kernel to address this vulnerability by adding the mapping invalidate lock around the read operation in sb_write_pointer(). Users should apply the official kernel updates that include this fix. Patch status is not explicitly confirmed in the input data; therefore, check the vendor advisory for current remediation guidance.

Description

A vulnerability in the Linux kernel's Btrfs filesystem was resolved by adding a lock to protect the sb_write_pointer() function. This function reads the super block from the block device page cache, and previously had a race condition related to block size changes. The fix involves taking the mapping invalidate lock around the read operation to serialize it against block size changes.

References

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