CVE-2026-43032: Linux kernel · NFC: pn533: bound the UART receive buffer
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 12 Nov 2026, 00:50 UTC
Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA
Thin evidence
One scorer or noneExploitation evidence
Disclosed: evidence found.
CVE published 1 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 11 Nov 2026.
What to do
AI-suggested
A fix has been implemented in the Linux kernel to bound the UART receive buffer and drop partial frames when the buffer is full. Users should update to the fixed Linux kernel version containing this patch once available. No other mitigation steps are indicated.
Description
A vulnerability in the Linux kernel NFC driver for the pn533 device allowed the UART receive buffer to grow without bounds when receiving malformed UART traffic. This was due to the driver appending every incoming byte to the receive buffer until a complete frame was recognized, potentially exhausting buffer limits. The issue has been resolved by bounding the receive buffer and dropping partial frames once the buffer is full.
References
- git.kernel.org/stable/c/8bedf1dd5640ac8997bff00bbefe241b438df397 (opens in a new tab)
- git.kernel.org/stable/c/23e925183db26cd322597679669ad29d70ed2ada (opens in a new tab)
- git.kernel.org/stable/c/3adca9be14bf36b927193f05f5aea35a1a90e913 (opens in a new tab)
- git.kernel.org/stable/c/2c1fadd221b21d8038acfe6a0f56291881d5ff76 (opens in a new tab)
- git.kernel.org/stable/c/f48ab6ee654ecc350434e4566bc785773f412b7e (opens in a new tab)
- git.kernel.org/stable/c/ad2f60de5045bfb5d20ea468a97c8760c6a3a4f8 (opens in a new tab)
- git.kernel.org/stable/c/cf2ff10183204349edfd6b972e189375fc5f1fb0 (opens in a new tab)
- git.kernel.org/stable/c/30fe3f5f6494f827d812ff179f295a8e532709d6 (opens in a new tab)