High [CVE-2026-52912] hold bridge skb->dev while queued
This high-severity Red Hat Linux advisory covers CVE-2026-52912 affecting Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 10.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published Record updated
Summary
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. This can result in system instability or a denial of service.
Red Hat severity: Important — CVSS 7.8 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H). Weakness: CWE-911.
Affected Red Hat products: Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 10. Red Hat fixing advisory: RHSA-2026:71330, RHSA-2026:71329, RHSA-2026:71700.
Affected products named by the advisory: Red Hat package: kernel-rt.
Is CVE-2026-52912 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2026-52912 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2026-52912?
Upgrade to a fixed release named by Red Hat:
- kernel-rt-0:4.18.0-553.168.1.rt7.509.el8_10
- kernel-0:4.18.0-553.168.1.el8_10
- kernel-0:5.14.0-687.52.1.el9_8
- RHSA-2026:71330
- RHSA-2026:71329
- RHSA-2026:71700
Confirm against the vendor advisory before you patch.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 15 days ago·verify at source
- kernel-rt-0:4.18.0-553.168.1.rt7.509.el8_10
- kernel-0:4.18.0-553.168.1.el8_10
- kernel-0:5.14.0-687.52.1.el9_8
- RHSA-2026:71330
- RHSA-2026:71329
- RHSA-2026:71700
Official advisory · high-confidence parse· fetched 15 days ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Official advisory · high-confidence parse· fetched 15 days ago·verify at source
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