PT-2026-35012 · Linux · Linux Kernel

Published 2026-04-24 · Updated 2026-05-26 · CVE-2026-31660

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A flaw exists in the NFC PN533 component where the pn532 receive buf() function may fail to allocate a fresh receive buffer before consuming bytes. If the alloc skb() function fails, the callback returns 0 despite having already consumed bytes, leaving the recv skb variable as NULL. This behavior violates the receive buffer accounting contract and can lead to a NULL pointer dereference during the subsequent skb put u8() operation.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Related Identifiers

CVE-2026-31660

ECHO-ED90-A523-826A

Affected Products

Linux Kernel

References · 20

• https://git.kernel.org/stable/c/16649adc2e19509104245ea1f349b629d858f11f · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-31660 · Vendor Advisory
• https://git.kernel.org/stable/c/a9495069b43b8634c1ae0042e888766c34f66637 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-31660 · Security Note
• https://git.kernel.org/stable/c/2ca64fb7e2d2ae14619dd204d4f2f0a601f421fb · Patch
• https://cve.org/CVERecord?id=CVE-2026-31660 · Security Note
• https://git.kernel.org/stable/c/21ae2cda66a55c759607bbf1d23cbaa42019d2de · Patch
• https://git.kernel.org/stable/c/07cb6c72e66ba548679f22ac29ad588da8999279 · Patch
• https://osv.dev/vulnerability/BELL-CVE-2026-31660 · Vendor Advisory
• https://git.kernel.org/stable/c/8b71299d587d9e4c830c18afb884c80ddb30ad28 · Patch
• https://git.kernel.org/stable/c/7e37da42eda45d7859d9273fc7e225d8df458038 · Patch
• https://ubuntu.com/security/CVE-2026-31660 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-OS-UBUNTU-2204-CVE-2026-31660 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-31660 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-31660 · Vendor Advisory