Bug 2492105 (CVE-2026-52912) - CVE-2026-52912 kernel: netfilter: nf_queue: hold bridge skb->dev while queued
Summary: CVE-2026-52912 kernel: netfilter: nf_queue: hold bridge skb->dev while queued
Keywords:
Status: NEW
Alias: CVE-2026-52912
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-06-24 08:02 UTC by OSIDB Bzimport
Modified: 2026-06-24 17:42 UTC (History)
2 users (show)

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


Attachments (Terms of Use)

Description OSIDB Bzimport 2026-06-24 08:02:14 UTC
In the Linux kernel, the following vulnerability has been resolved:

netfilter: nf_queue: hold bridge skb->dev while queued

br_pass_frame_up() rewrites skb->dev from the ingress port to the bridge
master before queueing bridge LOCAL_IN packets. NFQUEUE only holds
references on state.in/out and bridge physdevs, so a queued bridge
packet can retain a freed bridge master in skb->dev until reinjection.

When the verdict is reinjected later, br_netif_receive_skb() re-enters
the receive path with skb->dev still pointing at the freed bridge master,
triggering a use-after-free.

Store skb->dev in the queue entry, hold a reference on it for the queue
lifetime, and use the saved device when dropping queued packets during
NETDEV_DOWN handling.

Comment 1 Mauro Matteo Cascella 2026-06-24 17:40:14 UTC
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026062426-CVE-2026-52912-9506@gregkh/T


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