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CVE-2026-43373: net: ncsi: fix skb leak in error paths

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-08 · updated 2026-06-17
• Weakness: CWE-401

Description

In the Linux kernel, the following vulnerability has been resolved: net: ncsi: fix skb leak in error paths Early return paths in NCSI RX and AEN handlers fail to release the received skb, resulting in a memory leak. Specifically, ncsi_aen_handler() returns on invalid AEN packets without consuming the skb. Similarly, ncsi_rcv_rsp() exits early when failing to resolve the NCSI device, response handler, or request, leaving the skb unfreed.

Affected products

• Linux kernel: from 4.8 before 5.10.253; from 5.11 before 5.15.203; from 5.16 before 6.1.167; from 6.2 before 6.6.130; from 6.7 before 6.12.78; from 6.13 before 6.18.19 — fixed in 5.10.253, 5.15.203, 6.1.167, 6.12.78, 6.18.19, 6.19.9

How to fix

Upgrade to a fixed version: Linux kernel 5.10.253, 5.15.203, 6.1.167, 6.12.78. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/553366c271479c0d571dd1bb5d1bcde4747fb82e
• https://git.kernel.org/stable/c/59962588197863d0d746879f193905c0c6b3df49
• https://git.kernel.org/stable/c/5c3398a54266541610c8d0a7082e654e9ff3e259
• https://git.kernel.org/stable/c/81d6aee32f8f7bbc175c05dbf61f4430bfb88c4a
• https://git.kernel.org/stable/c/87138dde2d6937b12b967f28fe598a7d59000ae4
• https://git.kernel.org/stable/c/9891d7f4f1ede473c54b49776ae07755083eef06
• https://git.kernel.org/stable/c/b70c4e5e711931cdd56e6e905737b72f1e649189
• https://git.kernel.org/stable/c/fef5aa6e3bcf3c8053307642663a63b7362d7552

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