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CVE-2026-80797: nfc: pn533: purge fragmented skbs during cleanup

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-04 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: nfc: pn533: purge fragmented skbs during cleanup pn53x_common_clean() purges resp_q before freeing the common PN533 state, but it leaves fragment_skb untouched. The fragmentation helpers queue transmit fragments there while sending large initiator or target-mode frames, and those skbs remain owned by the driver until they are sent or discarded. If the device is removed while fragments are still queued, the common cleanup path frees the PN533 state without releasing the queued fragment skbs, leaking them. Purge fragment_skb during cleanup alongside resp_q.

Affected products

• Linux kernel: 3.12 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/130b5ad4492f8e53d0398ee3af2b0e2388504d11
• https://git.kernel.org/stable/c/2f5d093194ec24d7c29b91bf7df014924e0f4ea1
• https://git.kernel.org/stable/c/4a52ec2457ff8c26206fcc20fa1972cc35a678c4
• https://git.kernel.org/stable/c/5718fc62198c38c2de5316020a90506f9e75e0bb
• https://git.kernel.org/stable/c/9319c3c4962efc8697246b563ea31c6d47f085aa
• https://git.kernel.org/stable/c/d63e85c5d5555fe6aa65155d3a09452597e163c3
• https://git.kernel.org/stable/c/e169277281373818ae1cedf976aa1e99118fb77d
• https://git.kernel.org/stable/c/e7ed2ea5590fbe2d3be39ee4fb0c758a12e31d0c
• https://git.kernel.org/stable/c/e95beff58b38c871c557bf84e528408283c2c0ad

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