7.8

CVE-2026-52912: linux Use After Free

CVSS: 7.8v3.1HighModified
AliasesUBUNTU-CVE-2026-52912DEBIAN-CVE-2026-52912
Published 24-06-2026Last modified 19-10-2026
Open JSON

Vulnerability summary

CVE-2026-52912 is a high (CVSS 7.8) Use After Free vulnerability in linux. EPSS estimates a 0.16% chance of exploitation in the next 30 days, higher than 4.3% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.16%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 51 · Related 48
OPENSUSE-SU-2026:21910-1RHSA-2026:71329RHSA-2026:71330RHSA-2026:71700SUSE-SU-2026:23881-1SUSE-SU-2026:23887-1

Timeline

  1. 24-06-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

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 metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.16%

Chance of exploitation in the next 30 days

Percentile

4%

Versus all other CVEs

30-day change

+0.01 pp

From 0.14% on 20-09-2026

20-09-202620-10-2026
EPSS score
0.16%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu166 products
  • linuxAll versions (No fix recorded) | < 5.15.0-186.196 | < 6.8.0-139.139 | < 7.0.0-28.28
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1112.119 | < 6.8.0-1064.67 | < 7.0.0-1009.9
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ ac28634456867b23b95faccba7997a62ec430603, < 950d809f154dca04e5fbe5d3c8b9c5e44769cd57 | ≥ ac28634456867b23b95faccba7997a62ec430603, < a698ac8ab2561cf575d2d9f34095032651dd952e | ≥ ac28634456867b23b95faccba7997a62ec430603, < 19924bdd8a45ebc72a7b84c57fd63057d1dc75ac | ≥ ac28634456867b23b95faccba7997a62ec430603, < 1e5e20031c5eee8d2e490a90ff4d6a2feecfc3be | ≥ ac28634456867b23b95faccba7997a62ec430603, < 3823c27099cfe2482299065814adbaa771be9644 | ≥ ac28634456867b23b95faccba7997a62ec430603, < 15d464265120ab9818bd673af301deee09bedab2 | ≥ ac28634456867b23b95faccba7997a62ec430603, < 3fb0f5c0f64162a8c3f25616a4f1e340b921737f | ≥ ac28634456867b23b95faccba7997a62ec430603, < e196115ec330a18de415bdb9f5071aa9f08e53ce | 4.7
  • linux_kernel≥ 4.7, < 5.10.259 | ≥ 5.11, < 5.15.209 | ≥ 5.16, < 6.1.175 | ≥ 6.2, < 6.6.142 | ≥ 6.7, < 6.12.92 | ≥ 6.13, < 6.18.34 | ≥ 6.19, < 7.0.11 | 7.1:rc1 | 7.1:rc2 | 7.1:rc3 | 7.1:rc4
Debian1 product
  • linux< 6.1.176-1 | < 6.12.94-1 | < 7.0.12-1

3 vendors · 169 products

References

50 links
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