CVE-2026-98487Medium· 5.5▾ SunlitA flaw was found in the Linux kernel's network bridge subsystem. When deleting multicast database (MDB) port groups, the kernel can maintain a stale reference to memory that has already been freed during recursive group removal, resulting …
▾ Sunlit zone — Low / medium · no exploitation signal
impact 30.3 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Oct 20.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CSAF
0.2%
— → 5.5
none → medium
Last analysed / modified upstream
5.5 → 7.8
medium → high
7.8 → 5.5
high → medium
A flaw was found in the Linux kernel's network bridge subsystem. When deleting multicast database (MDB) port groups, the kernel can maintain a stale reference to memory that has already been freed during recursive group removal, resulting in a use-after-free condition. A local attacker could exploit this vulnerability through bridge management operations to trigger a system crash, leading to a Denial of Service (DoS), or potentially achieve privilege escalation.
kernel: net: bridge: mdb: restart port group walk after deletion — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-24.
Affected:
No fix planned:
Not affected:
Out of support scope
Workarounds / mitigations:
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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