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🛡️ CVE-2026-31660 — kernel

🟡 CVSS 5.5 — Medium ✅ No Known Exploit NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

nfc: pn533: allocate rx skb before consuming bytes

In the Linux kernel, the following vulnerability has been resolved:

nfc: pn533: allocate rx skb before consuming bytes

pn532_receive_buf() reports the number of accepted bytes to the serdev

core. The current code consumes bytes into recv_skb and may already hand

a complete frame to pn533_recv_frame() before allocating a fresh receive

buffer.

If that alloc_skb() fails, the callback returns 0 even though it has

already consumed bytes, and it leaves recv_skb as NULL for the next

receive callback. That breaks the receive_buf() accounting contract and

can also lead to a NULL dereference on the next skb_put_u8().

Allocate the receive skb lazily before consuming the next byte instead.

If allocation fails, return the number of bytes already accepted.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

Affected software

CVE-2026-31660 is recorded against 2 packages.

  • kernel (from 6.19.0 up to 6.19.13)
  • linux-kernel

Timeline and source

Published on 24 April 2026 and last revised on 15 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2026-31660 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Medium
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2026-04-24
Updated 2026-08-20
Modified 2026-08-15

Affected Packages

Software From version Fixed in
kernel 6.19.0 6.19.13
linux-kernel — —

References

Similar Threats

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