Bug 2536290 (CVE-2026-92486)

Summary:	CVE-2026-92486 kernel: bpf: Fix CFI mismatch in task work callback
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
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, specifically within its Berkeley Packet Filter (BPF) subprograms. This vulnerability arises from a mismatch in how BPF subprograms handle certain internal functions, known as callbacks. When a task attempts to execute a callback, it uses an incorrect method, which can bypass the kernel's Control-Flow Integrity (kCFI) protections. This bypass could potentially allow an attacker to interfere with the normal operation of the kernel.	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 2026-09-17 17:16:33 UTC

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

bpf: Fix CFI mismatch in task work callback

BPF subprograms use the bpf_callback_t ABI, but task work invokes the
callback through a three-argument function pointer. This trips kCFI.

Store and invoke the callback as bpf_callback_t.

Comment 1 gkamathe 2026-09-20 13:26:11 UTC

Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-92486.mbox