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Vulnerability record · CVE-2026-52912 · published 24 June 2026

CVE-2026-52912: Linux kernel use after free vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.15% · top 96.3% CWE-416 · Use after free
7.8CVSS 3.1 base score
0.15%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
9References
8 Sep 2026Last modified by NVD

Description

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/15d464265120ab9818bd673af301deee09bedab2 Patch
https://git.kernel.org/stable/c/19924bdd8a45ebc72a7b84c57fd63057d1dc75ac Patch
https://git.kernel.org/stable/c/1e5e20031c5eee8d2e490a90ff4d6a2feecfc3be Patch
https://git.kernel.org/stable/c/3823c27099cfe2482299065814adbaa771be9644 Patch
https://git.kernel.org/stable/c/3fb0f5c0f64162a8c3f25616a4f1e340b921737f Patch
https://git.kernel.org/stable/c/950d809f154dca04e5fbe5d3c8b9c5e44769cd57 Patch
https://git.kernel.org/stable/c/a698ac8ab2561cf575d2d9f34095032651dd952e Patch
https://git.kernel.org/stable/c/e196115ec330a18de415bdb9f5071aa9f08e53ce Patch
https://cert-portal.siemens.com/productcert/html/ssa-019113.html

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Source: NIST National Vulnerability Database (record CVE-2026-52912), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.