VulnerabilityPublished 28 Oct 2026

CVE-2026-99155: Linux kernel · scsi: xen/scsifront: Check for a NULL shadow entry on a backend response

Source GCVE Database

Authoritative record:CVE-2026-99155

Not known to be exploited · fixed in 15791e57f57f7050014d08cfe239d4aa1e6b94b0 : patch Linux kernel soon.

Data as of 28 Oct 2026, 13:58 UTC

Severity

High

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

Patch: Available – fixed in 15791e57f57f7050014d08cfe239d4aa1e6b94b0, 8c8222c255772713eb36cde695777a1fce224917, 1d91ec793d6c80eca963d426e0da832d40a062df

Exploitation evidence

Disclosed: evidence found.
CVE published 28 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-p98p-xmcg-j23c

What to do

Upgrade Linux kernel to 15791e57f57f7050014d08cfe239d4aa1e6b94b0, 8c8222c255772713eb36cde695777a1fce224917 or 1d91ec793d6c80eca963d426e0da832d40a062df.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 6d1c2f48f3fcf5f42967938c8ba6b42ac6b44b43, < 15791e57f57f7050014d08cfe239d4aa1e6b94b0	Fixed in 15791e57f57f7050014d08cfe239d4aa1e6b94b0
LinuxLinux	Affected ≥ 6d1c2f48f3fcf5f42967938c8ba6b42ac6b44b43, < 8c8222c255772713eb36cde695777a1fce224917	Fixed in 8c8222c255772713eb36cde695777a1fce224917
LinuxLinux	Affected ≥ 6d1c2f48f3fcf5f42967938c8ba6b42ac6b44b43, < 1d91ec793d6c80eca963d426e0da832d40a062df	Fixed in 1d91ec793d6c80eca963d426e0da832d40a062df
LinuxLinux	Affected =5.19	Fixed in–
Debiandebian/linux`pkg:deb/debian/linux`Other threats	Affected =5.19	Fixed in–

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

AI-suggested

A fix has been implemented to reject backend responses whose shadow slots are not populated, preventing NULL pointer dereferences. Users should apply the official kernel update that includes this fix once available.

Description

A vulnerability in the Linux kernel's scsi xen/scsifront driver allows a malicious or buggy backend to cause a guest crash by sending a backend response with an in-range rqid that does not correspond to an outstanding request. This leads to a NULL pointer dereference due to missing checks on shadow entries before dereferencing.

References

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