Bug 2555231 (CVE-2026-98814)

Summary:	CVE-2026-98814 kernel: nvme: fix command effects log lifetime for multipath heads
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, watson-tool-maintainers
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	---
Doc Text:	A flaw was found in the Linux kernel's Non-Volatile Memory Express (NVMe) driver. A local attacker can cause a denial of service (DoS) or potentially escalate privileges by exploiting a use-after-free flaw. This issue occurs when an input/output (I/O) passthrough command is sent through a multipath storage device after the initial controller path has been removed, causing the kernel to access already-freed memory.	Story Points:	---
Clone Of:		Environment:
Last Closed:		Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-10-18 16:03:28 UTC

In the Linux kernel, the following vulnerability has been resolved:

nvme: fix command effects log lifetime for multipath heads

KASAN reported a use-after-free when an I/O passthrough command was sent
through a multipath namespace head after the controller path that first
created the head had been removed:

  BUG: KASAN: slab-use-after-free in nvme_command_effects+0x192/0x200 [nvme_core]
  Read of size 4 at addr ffff888141b14400 by task nvme/19811
  nvme_command_effects+0x192/0x200 [nvme_core]
  nvme_cmd_allowed+0x7e/0x1b0 [nvme_core]
  nvme_user_cmd.constprop.0+0x1b5/0x450 [nvme_core]
  nvme_ns_head_chr_ioctl+0xf4/0x2a0 [nvme_core]

Move the log cache to the subsystem, with one entry per command set. Both
controllers and namespace heads hold subsystem references, keeping their
log pointers valid until subsystem release.

Comment 1 Mauro Matteo Cascella 2026-10-23 17:50:31 UTC

Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98814.mbox