Skip to main content
cve.nowby Sazabi
← All vulnerabilities
CVE-2026-80802

nfc: fdp: bound the device-reported read length and fix an skb leak

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.267, 5.15.218, 6.1.185, 6.6.154, 6.12.106, and 3 more
None on Exploit-DB, Metasploit or GitHub

Summary

In the Linux kernel, the following vulnerability has been resolved: nfc: fdp: bound the device-reported read length and fix an skb leak fdp_nci_i2c_read() takes the next packet length from two device-supplied bytes and never validates it. The value is a u16 used as the i2c_master_recv() count into a 261-byte on-stack buffer: a malicious, counterfeit or malfunctioning controller (or an i2c bus interposer) can drive it far past the buffer for a stack out-of-bounds write that clobbers the canary and return address, or below the minimum frame size (directly, or by truncating the computed sum) so the header/LRC strip and the next length read run past a short receive. Reject a length outside [FDP_NCI_I2C_MIN_PAYLOAD, FDP_NCI_I2C_MAX_PAYLOAD], as a corrupted packet already is, and force resynchronization. The same loop allocates one data skb per iteration and assumes a length packet followed by a data packet; a device that sends two data packets in one call leaks the first skb when the second allocation overwrites it. Free a previously allocated skb before allocating the next.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From a06347c04c13e380afce0c9816df51f00b83faf1 · fixed in d9498ab9a78cb63d78dbe4f221d8cc6c91f285ee; From a06347c04c13e380afce0c9816df51f00b83faf1 · fixed in 1fc32327b927a6e2cde086f82575c29880844228; From a06347c04c13e380afce0c9816df51f00b83faf1 · fixed in 8d2c243b79854628ff076c38748c020042f02f57; From a06347c04c13e380afce0c9816df51f00b83faf1 · fixed in fc3c2bd5b1ec6c7cbc8a50e32d9bcec114f25463; From a06347c04c13e380afce0c9816df51f00b83faf1 · fixed in 0d723090645b82c1cb27cfd7ebf81f0e7c96bcae; From a06347c04c13e380afce0c9816df51f00b83faf1 · fixed in db7e464b350969c6ea8340de00d9796e5fd5123b; From a06347c04c13e380afce0c9816df51f00b83faf1 · fixed in e5eec121f2c3bc4c7022613bedd9121a8aa4c949; From a06347c04c13e380afce0c9816df51f00b83faf1 · fixed in 1aa3fc769b0c45bd19f8dab1697084c2b3f6d706; From a06347c04c13e380afce0c9816df51f00b83faf1 · fixed in 7ad21dcfeb5181af0c3ee2608808c0c0a5283aa1

  • Linux Linux

    4.4

  • KernelLinux

    From 4.4.0 · fixed in 5.10.267; From 5.11.0 · fixed in 5.15.218; From 5.16.0 · fixed in 6.1.185; From 6.2.0 · fixed in 6.6.154; From 6.7.0 · fixed in 6.12.106; From 6.13.0 · fixed in 6.18.47; From 6.19.0 · fixed in 7.1.11; From 7.2.0 · fixed in 7.2.1

References 9

git.kernel.org