CVE-2026-98582

nfc: st21nfca: validate received frame size

State: Published
Severity: Not scored
Published: Oct 18, 2026
Updated: Oct 19, 2026
Reserved: Sep 25, 2026

Description

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

nfc: st21nfca: validate received frame size

st21nfca_hci_i2c_repack() trims a received frame at its EOF marker before removing byte stuffing. It then assumes the truncated frame contains the LLC header and two CRC bytes, and it unconditionally reads the byte after an escape marker.

A malformed frame can place EOF immediately after the start marker or can end its data portion with an escape marker. The former leaves too few bytes for check_crc(), while the latter makes the unstuffing loop read past the current skb length.

Require the minimum framing bytes both before and after unstuffing. Use separate input and output cursors while removing byte stuffing, and reject an escape marker without its encoded byte. This keeps malformed frames within the received frame boundary before CRC processing.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	3096e25a3e40b73afd59e46f3bf8d84f919992a1 to before 8934d2889ae16a7c77520e002398d0689c1ecea5Affected 3096e25a3e40b73afd59e46f3bf8d84f919992a1 to before d0596ee6c4b928a5c288790522a7495ee867da72Affected 3096e25a3e40b73afd59e46f3bf8d84f919992a1 to before f526c218a149a30f110ce434ff17e033042404b8Affected 3096e25a3e40b73afd59e46f3bf8d84f919992a1 to before d4008c3499dba7829bfe002edd99a8bff8ae3a7cAffected 3096e25a3e40b73afd59e46f3bf8d84f919992a1 to before 91be5161f37b0a2795ad6806d69be5fa74522e5cAffected 3096e25a3e40b73afd59e46f3bf8d84f919992a1 to before 57919d0662d8856211b794140172e51ca389f23dAffected 3096e25a3e40b73afd59e46f3bf8d84f919992a1 to before 7b996cc06dda54c02a5aa607bda01109f0ac51e6Affected 3096e25a3e40b73afd59e46f3bf8d84f919992a1 to before a653c01ce447f10c36b901646888c0330363af4fAffected
LinuxLinux	3.16Affected before 3.16Not affected 5.10.271 through 5.10.Not affected 5.15.222 through 5.15.Not affected 6.1.189 through 6.1.Not affected 6.6.158 through 6.6.Not affected 6.12.112 through 6.12.Not affected 6.18.55 through 6.18.Not affected 7.2.9 through 7.2.*Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

3096e25a3e40b73afd59e46f3bf8d84f919992a1 to before 8934d2889ae16a7c77520e002398d0689c1ecea5Affected
3096e25a3e40b73afd59e46f3bf8d84f919992a1 to before d0596ee6c4b928a5c288790522a7495ee867da72Affected
3096e25a3e40b73afd59e46f3bf8d84f919992a1 to before f526c218a149a30f110ce434ff17e033042404b8Affected
3096e25a3e40b73afd59e46f3bf8d84f919992a1 to before d4008c3499dba7829bfe002edd99a8bff8ae3a7cAffected
3096e25a3e40b73afd59e46f3bf8d84f919992a1 to before 91be5161f37b0a2795ad6806d69be5fa74522e5cAffected
3096e25a3e40b73afd59e46f3bf8d84f919992a1 to before 57919d0662d8856211b794140172e51ca389f23dAffected
3096e25a3e40b73afd59e46f3bf8d84f919992a1 to before 7b996cc06dda54c02a5aa607bda01109f0ac51e6Affected
3096e25a3e40b73afd59e46f3bf8d84f919992a1 to before a653c01ce447f10c36b901646888c0330363af4fAffected

LinuxLinux

3.16Affected
before 3.16Not affected
5.10.271 through 5.10.*Not affected
5.15.222 through 5.15.*Not affected
6.1.189 through 6.1.*Not affected
6.6.158 through 6.6.*Not affected
6.12.112 through 6.12.*Not affected
6.18.55 through 6.18.*Not affected
7.2.9 through 7.2.*Not affected
7.3 and laterNot affected

References

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