Bug 2525484 (CVE-2026-80601)

Summary:	CVE-2026-80601 kernel: batman-adv: gw: acquire ethernet header only after skb realloc
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:	rhel-process-autobot, 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 `batman-adv` (Better Approach To Mobile Ad-hoc Networking - Advanced) module of the Linux kernel. When the `pskb_may_pull()` function is called by `batadv_get_vid()`, it can reallocate the buffer, causing variables to point to a freed memory region. This use-after-free vulnerability could allow a local attacker to cause a denial of service or potentially execute arbitrary code.	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 2026-08-28 07:47:22 UTC

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

batman-adv: gw: acquire ethernet header only after skb realloc

The pskb_may_pull() called by batadv_get_vid() could reallocate the buffer
behind the skb. Variables which were pointing to the old buffer need to be
reassigned to avoid an use-after-free.

Comment 1 gkamathe 2026-08-31 15:00:39 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026082831-CVE-2026-80601-3b8f@gregkh/T