# CVE-2026-52912: netfilter: nf_queue: hold bridge skb->dev while queued

Status: published. Published: 2026-06-24. Updated: 2026-11-10.

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.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- Linux / Linux: ≥ ac28634456867b23b95faccba7997a62ec430603; < 950d809f154dca04e5fbe5d3c8b9c5e44769cd57 (affected, git); ≥ ac28634456867b23b95faccba7997a62ec430603; < a698ac8ab2561cf575d2d9f34095032651dd952e (affected, git); ≥ ac28634456867b23b95faccba7997a62ec430603; < 19924bdd8a45ebc72a7b84c57fd63057d1dc75ac (affected, git); ≥ ac28634456867b23b95faccba7997a62ec430603; < 1e5e20031c5eee8d2e490a90ff4d6a2feecfc3be (affected, git); ≥ ac28634456867b23b95faccba7997a62ec430603; < 3823c27099cfe2482299065814adbaa771be9644 (affected, git); ≥ ac28634456867b23b95faccba7997a62ec430603; < 15d464265120ab9818bd673af301deee09bedab2 (affected, git); ≥ ac28634456867b23b95faccba7997a62ec430603; < 3fb0f5c0f64162a8c3f25616a4f1e340b921737f (affected, git); ≥ ac28634456867b23b95faccba7997a62ec430603; < e196115ec330a18de415bdb9f5071aa9f08e53ce (affected, git). Source: CNA: Linux
- Linux / Linux: 4.7 (affected); ≥ 0; < 4.7 (unaffected, semver); ≥ 5.10.259; ≤ 5.10.* (unaffected, semver); ≥ 5.15.209; ≤ 5.15.* (unaffected, semver); ≥ 6.1.175; ≤ 6.1.* (unaffected, semver); ≥ 6.6.142; ≤ 6.6.* (unaffected, semver); ≥ 6.12.92; ≤ 6.12.* (unaffected, semver); ≥ 6.18.34; ≤ 6.18.* (unaffected, semver); ≥ 7.0.11; ≤ 7.0.* (unaffected, semver); ≥ 7.1; ≤ * (unaffected, original_commit_for_fix). Source: CNA: Linux
- Siemens / SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0): ≥ V3.1.6; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0): ≥ V3.1.7; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0): ≥ V3.1.6; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0): ≥ V3.1.7; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0): ≥ V3.1.6; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0): ≥ V3.1.7; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0): ≥ V3.1.6; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0): ≥ V3.1.7; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0): ≥ V3.1.6; < * (affected, custom). Source: ADP: siemens-SADP
- Siemens / SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0): ≥ V3.1.7; < * (affected, custom). Source: ADP: siemens-SADP

## Severity and prioritization

- CVSS 3.1: 7.8 (high); CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H; source: CNA: Linux

- CISA KEV: No listing in collected sources

- EPSS: 0.16% as of 2026-11-09; percentile 4.87%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-416

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://git.kernel.org/stable/c/950d809f154dca04e5fbe5d3c8b9c5e44769cd57 (CNA: Linux)

- https://git.kernel.org/stable/c/a698ac8ab2561cf575d2d9f34095032651dd952e (CNA: Linux)

- https://git.kernel.org/stable/c/19924bdd8a45ebc72a7b84c57fd63057d1dc75ac (CNA: Linux)

- https://git.kernel.org/stable/c/1e5e20031c5eee8d2e490a90ff4d6a2feecfc3be (CNA: Linux)

- https://git.kernel.org/stable/c/3823c27099cfe2482299065814adbaa771be9644 (CNA: Linux)

- https://git.kernel.org/stable/c/15d464265120ab9818bd673af301deee09bedab2 (CNA: Linux)

- https://git.kernel.org/stable/c/3fb0f5c0f64162a8c3f25616a4f1e340b921737f (CNA: Linux)

- https://git.kernel.org/stable/c/e196115ec330a18de415bdb9f5071aa9f08e53ce (CNA: Linux)

- https://cert-portal.siemens.com/productcert/html/ssa-019113.html (ADP: siemens-SADP)

- https://cert-portal.siemens.com/productcert/html/ssa-457936.html (ADP: siemens-SADP)

## Provenance

- CNA: Linux: https://www.cve.org/CVERecord?id=CVE-2026-52912; retrieved 2026-11-10; source updated 2026-11-10

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-52912; retrieved 2026-11-10; source updated Not reported

Revision: 8d4aea8d516b95314bda59b4c0face164da15b29659283e6d07f823517a974bd

Canonical: https://y2.dev/cve/CVE-2026-52912

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