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CVE-2026-31622

NFC: digital: Bounds check NFC-A cascade depth in SDD response handler

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.258, 5.15.209, 6.1.175, 6.6.136, 6.12.83, and 3 more
None on Exploit-DB, Metasploit or GitHub

Summary

In the Linux kernel, the following vulnerability has been resolved: NFC: digital: Bounds check NFC-A cascade depth in SDD response handler The NFC-A anti-collision cascade in digital_in_recv_sdd_res() appends 3 or 4 bytes to target->nfcid1 on each round, but the number of cascade rounds is controlled entirely by the peer device. The peer sets the cascade tag in the SDD_RES (deciding 3 vs 4 bytes) and the cascade-incomplete bit in the SEL_RES (deciding whether another round follows). ISO 14443-3 limits NFC-A to three cascade levels and target->nfcid1 is sized accordingly (NFC_NFCID1_MAXSIZE = 10), but nothing in the driver actually enforces this. This means a malicious peer can keep the cascade running, writing past the heap-allocated nfc_target with each round. Fix this by rejecting the response when the accumulated UID would exceed the buffer. Commit e329e71013c9 ("NFC: nci: Bounds check struct nfc_target arrays") fixed similar missing checks against the same field on the NCI path.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From 2c66daecc4092e6049673c281b2e6f0d5e59a94c · fixed in 9ba6bb09e00b922d902f684f575779e5433fe6e3; From 2c66daecc4092e6049673c281b2e6f0d5e59a94c · fixed in f83b399aa05a0712e3b1569a30d3d90b3533d2ef; From 2c66daecc4092e6049673c281b2e6f0d5e59a94c · fixed in 20663102c14566e900e1d2f679e30b7f1694f387; From 2c66daecc4092e6049673c281b2e6f0d5e59a94c · fixed in 2819f34e08bdffb6f06a51c67948ec5737fb166a; From 2c66daecc4092e6049673c281b2e6f0d5e59a94c · fixed in 1bec5698b55aa2be5c3b983dba657c01d0fd3dbc; From 2c66daecc4092e6049673c281b2e6f0d5e59a94c · fixed in 5a59bf70c38ee1eb4be03bab830bbc3a6f0bd1f1; From 2c66daecc4092e6049673c281b2e6f0d5e59a94c · fixed in 8d9d9bf3565271ca7ab9c716a94e87296177e7ba; From 2c66daecc4092e6049673c281b2e6f0d5e59a94c · fixed in cc024a3de265ef6c58957f4990eccb9f806208cb; From 2c66daecc4092e6049673c281b2e6f0d5e59a94c · fixed in 46ce8be2ced389bccd84bcc04a12cf2f4d0c22d1

  • Linux Linux

    3.13

  • KernelLinux

    From 3.13.0 · fixed in 5.10.258; From 5.11.0 · fixed in 5.15.209; From 5.16.0 · fixed in 6.1.175; From 6.2.0 · fixed in 6.6.136; From 6.7.0 · fixed in 6.12.83; From 6.13.0 · fixed in 6.18.24; From 6.19.0 · fixed in 6.19.14; From 6.20.0 · fixed in 7.0.1

References 9

git.kernel.org