Bug 2492110 (CVE-2026-52922)

Summary:	CVE-2026-52922 kernel: batman-adv: dat: handle forward allocation error
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security <prodsec-ir-bot>
Status:	NEW ---	QA Contact:
Severity:	unspecified	Docs Contact:
Priority:	unspecified
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 Linux kernel's batman-adv (Better Approach To Mobile Ad-hoc Networking) module. This vulnerability occurs because the `batadv_dat_forward_data()` function fails to validate the success of a memory allocation operation. An attacker could exploit this by triggering a scenario where the memory allocation fails, leading to a NULL pointer dereference and causing the system to crash. This results in a Denial of Service (DoS).	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 2026-06-24 08:02:24 UTC

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

batman-adv: dat: handle forward allocation error

batadv_dat_forward_data() calls pskb_copy_for_clone() to duplicate an skb
for each DHT candidate, but does not check the return value before passing
it to batadv_send_skb_prepare_unicast_4addr(). That function dereferences
the skb unconditionally, so a failed allocation triggers a NULL pointer
dereference.

Skip forwarding to the current DHT candidate on allocation failure.

Comment 1 Mauro Matteo Cascella 2026-06-24 08:41:25 UTC

Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026062430-CVE-2026-52922-fa85@gregkh/T