Bug 2436810 (CVE-2026-23098) - CVE-2026-23098 kernel: netrom: fix double-free in nr_route_frame()
Summary: CVE-2026-23098 kernel: netrom: fix double-free in nr_route_frame()
Keywords:
Status: NEW
Alias: CVE-2026-23098
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
unspecified
unspecified
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-02-04 17:04 UTC by OSIDB Bzimport
Modified: 2026-02-04 20:57 UTC (History)
0 users

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)

Description OSIDB Bzimport 2026-02-04 17:04:29 UTC 
In the Linux kernel, the following vulnerability has been resolved:

netrom: fix double-free in nr_route_frame()

In nr_route_frame(), old_skb is immediately freed without checking if
nr_neigh->ax25 pointer is NULL. Therefore, if nr_neigh->ax25 is NULL,
the caller function will free old_skb again, causing a double-free bug.

Therefore, to prevent this, we need to modify it to check whether
nr_neigh->ax25 is NULL before freeing old_skb.
Comment 1 Jon Moroney 2026-02-04 20:50:46 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026020427-CVE-2026-23098-1fd2@gregkh/T
Note You need to log in before you can comment on or make changes to this bug.