CVE-2026-52912
netfilter: nf_queue: hold bridge skb->dev while queued
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| 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) Other versions: unaffected |
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) Other versions: affected |
CNA: Linux |
| SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) Siemens |
≥ V3.1.6; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0) Siemens |
≥ V3.1.7; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) Siemens |
≥ V3.1.6; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0) Siemens |
≥ V3.1.7; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) Siemens |
≥ V3.1.6; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0) Siemens |
≥ V3.1.7; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) Siemens |
≥ V3.1.6; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AC0) Siemens |
≥ V3.1.7; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) Siemens |
≥ V3.1.6; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIPLUS S7-1500 CPU 1518-4 PN/DP MFP (6AG1518-4AX00-4AC0) Siemens |
≥ V3.1.7; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 7.8 high |
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H | CNA: Linux |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://git.kernel.org/stable/c/950d809f154dca04e5fbe5d3c8b9c5e44769cd57CNA: Linux
- https://git.kernel.org/stable/c/a698ac8ab2561cf575d2d9f34095032651dd952eCNA: Linux
- https://git.kernel.org/stable/c/19924bdd8a45ebc72a7b84c57fd63057d1dc75acCNA: Linux
- https://git.kernel.org/stable/c/1e5e20031c5eee8d2e490a90ff4d6a2feecfc3beCNA: Linux
- https://git.kernel.org/stable/c/3823c27099cfe2482299065814adbaa771be9644CNA: Linux
- https://git.kernel.org/stable/c/15d464265120ab9818bd673af301deee09bedab2CNA: Linux
- https://git.kernel.org/stable/c/3fb0f5c0f64162a8c3f25616a4f1e340b921737fCNA: Linux
- https://git.kernel.org/stable/c/e196115ec330a18de415bdb9f5071aa9f08e53ceCNA: Linux
- https://cert-portal.siemens.com/productcert/html/ssa-019113.htmlADP: siemens-SADP
- https://cert-portal.siemens.com/productcert/html/ssa-457936.htmlADP: siemens-SADP
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