VulnerabilityPublished 25 Sep 2026Updated 21 Oct 2026

CVE-2026-98161: Linux kernel · nvdimm: pmem: keep PREFLUSH before data writes

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in d34c30bc994328d9cf6749b2e9a32aabd08fd076 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:47 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 1% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in d34c30bc994328d9cf6749b2e9a32aabd08fd076, c644a2f8fef5618fcf453c591177700fd07dd024, 72561ca1ab96f0f0f32737a6171641e05a318538 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 25 Sep 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 ≥ c5d4355d10d414a96ca870b731756b89d068d57a, < d34c30bc994328d9cf6749b2e9a32aabd08fd076	Fixed in d34c30bc994328d9cf6749b2e9a32aabd08fd076
LinuxLinux	Affected ≥ c5d4355d10d414a96ca870b731756b89d068d57a, < c644a2f8fef5618fcf453c591177700fd07dd024	Fixed in c644a2f8fef5618fcf453c591177700fd07dd024
LinuxLinux	Affected ≥ c5d4355d10d414a96ca870b731756b89d068d57a, < 72561ca1ab96f0f0f32737a6171641e05a318538	Fixed in 72561ca1ab96f0f0f32737a6171641e05a318538
LinuxLinux	Affected ≥ c5d4355d10d414a96ca870b731756b89d068d57a, < 770a90c2127220f0fc194ce909ad4f0842e141cb	Fixed in 770a90c2127220f0fc194ce909ad4f0842e141cb
LinuxLinux	Affected ≥ c5d4355d10d414a96ca870b731756b89d068d57a, < 22d1f4dcdc9c6d0295c6db0c8933126098b14e05	Fixed in 22d1f4dcdc9c6d0295c6db0c8933126098b14e05
LinuxLinux	Affected =5.3	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: nvdimm: pmem: keep PREFLUSH before data writes pmem_submit_bio() records a REQ_PREFLUSH error, but continues to copy the bio data and can later overwrite the error with a successful REQ_FUA flush. That lets data writes run after a failed preflush and can complete the bio successfully despite the failed ordering barrier. Run the REQ_PREFLUSH flush synchronously before touching the bio data and complete the bio with the flush error if it fails. Keep asynchronous flush chaining for REQ_FUA. At that point, data copy has completed and the parent bio can wait for the chained flush bio.

References

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