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CVE-2022-48748: net: bridge: vlan: fix memory leak in __allowed_ingress

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-06-20 · updated 2026-06-17
• Weakness: CWE-400

Description

In the Linux kernel, the following vulnerability has been resolved: net: bridge: vlan: fix memory leak in __allowed_ingress When using per-vlan state, if vlan snooping and stats are disabled, untagged or priority-tagged ingress frame will go to check pvid state. If the port state is forwarding and the pvid state is not learning/forwarding, untagged or priority-tagged frame will be dropped but skb memory is not freed. Should free skb when __allowed_ingress returns false.

Affected products

• Linux kernel: from 5.6 before 5.10.96; from 5.11 before 5.15.19; from 5.16 before 5.16.5; 5.17-rc1 — fixed in 5.10.96, 5.15.19, 5.16.5

How to fix

Upgrade to a fixed version: Linux kernel 5.10.96, 5.15.19, 5.16.5. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/14be8d448fca6fe7b2a413831eedd55aef6c6511
• https://git.kernel.org/stable/c/446ff1fc37c74093e81db40811a07b5a19f1d797
• https://git.kernel.org/stable/c/c5e216e880fa6f2cd9d4a6541269377657163098
• https://git.kernel.org/stable/c/fd20d9738395cf8e27d0a17eba34169699fccdff
• https://git.kernel.org/stable/c/14be8d448fca6fe7b2a413831eedd55aef6c6511
• https://git.kernel.org/stable/c/446ff1fc37c74093e81db40811a07b5a19f1d797
• https://git.kernel.org/stable/c/c5e216e880fa6f2cd9d4a6541269377657163098
• https://git.kernel.org/stable/c/fd20d9738395cf8e27d0a17eba34169699fccdff

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