VulnerabilityPublished 26 Oct 2026

CVE-2026-99093: Linux kernel · mm: don't schedule deferred kernel page table freeing while booting

Source GCVE Database

Authoritative record:CVE-2026-99093· High

Not known to be exploited · fixed in df6c704a08bc0925d5db047b0a6221f962bda4d9 : patch Linux kernel soon.

Data as of 26 Oct 2026, 16:31 UTC

Severity

High

Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD

Patch: Available – fixed in df6c704a08bc0925d5db047b0a6221f962bda4d9, 7a25ca170c12a9328f6fcf4410713beb516b01c0, 2fb552b0bee70c24c092720028ab4620f5eb2646 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 26 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-j2hw-f9fx-vxwr

What to do

Upgrade Linux to df6c704a08bc0925d5db047b0a6221f962bda4d9, 7a25ca170c12a9328f6fcf4410713beb516b01c0 or 2fb552b0bee70c24c092720028ab4620f5eb2646; Linux and the Red Hat redhat/kernel package to 7.2.11 or 6.18.57.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 922873cf4fc34124215070a8ad391bf831538bb9, < df6c704a08bc0925d5db047b0a6221f962bda4d9	Fixed in df6c704a08bc0925d5db047b0a6221f962bda4d9
LinuxLinux	Affected ≥ 84e0cd79d57f06b872154eb5d8f610584133f260, < 7a25ca170c12a9328f6fcf4410713beb516b01c0	Fixed in 7a25ca170c12a9328f6fcf4410713beb516b01c0
LinuxLinux	Affected ≥ 9e4a3ec3411bb6bb59e3c1f29b75609f1e87aac4, < 2fb552b0bee70c24c092720028ab4620f5eb2646	Fixed in 2fb552b0bee70c24c092720028ab4620f5eb2646
LinuxLinux	Affected >=7.2.7 <7.2.11	Fixed in 7.2.11
LinuxLinux	Affected >=6.18.53 <6.18.57	Fixed in 6.18.57
Red Hatredhat/kernel`pkg:rpm/redhat/kernel`Other threats	Affected >=6.18.53 <6.18.57 >=7.2.7 <7.2.11	Fixed in 6.18.57 7.2.11

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A fix is available that prevents scheduling deferred kernel page table freeing work during system boot, deferring it until the workqueue is initialized. Users should apply the updated Linux kernel version containing this fix. No additional mitigation is required beyond applying the patch.

Description

A vulnerability in the Linux kernel's memory management subsystem causes a kernel panic during boot when using a boot-time function tracer with a specific filter. The issue arises because deferred kernel page table freeing is scheduled before the workqueue system is initialized, leading to a null pointer dereference and system crash. The flaw was introduced by a commit that allowed collapsing page tables to free kernel page tables prematurely during early boot. The fix prevents scheduling deferred freeing work while the system is still booting, deferring it until the workqueue is available.

References

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