CVE-2026-98582
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.
How to fix
- Linux Linux8934d2889ae16a7c77520e002398d0689c1ecea5, d0596ee6c4b928a5c288790522a7495ee867da72, f526c218a149a30f110ce434ff17e033042404b8, d4008c3499dba7829bfe002edd99a8bff8ae3a7c, 91be5161f37b0a2795ad6806d69be5fa74522e5c, 57919d0662d8856211b794140172e51ca389f23d, 7b996cc06dda54c02a5aa607bda01109f0ac51e6, a653c01ce447f10c36b901646888c0330363af4f or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 3096e25a3e40b73afd59e46f3bf8d84f919992a1 ≤ v < 8934d2889ae16a7c77520e002398d0689c1ecea5, 3096e25a3e40b73afd59e46f3bf8d84f919992a1 ≤ v < d0596ee6c4b928a5c288790522a7495ee867da72, 3096e25a3e40b73afd59e46f3bf8d84f919992a1 ≤ v < f526c218a149a30f110ce434ff17e033042404b8, 3096e25a3e40b73afd59e46f3bf8d84f919992a1 ≤ v < d4008c3499dba7829bfe002edd99a8bff8ae3a7c, 3096e25a3e40b73afd59e46f3bf8d84f919992a1 ≤ v < 91be5161f37b0a2795ad6806d69be5fa74522e5c, 3096e25a3e40b73afd59e46f3bf8d84f919992a1 ≤ v < 57919d0662d8856211b794140172e51ca389f23d, 3096e25a3e40b73afd59e46f3bf8d84f919992a1 ≤ v < 7b996cc06dda54c02a5aa607bda01109f0ac51e6, 3096e25a3e40b73afd59e46f3bf8d84f919992a1 ≤ v < a653c01ce447f10c36b901646888c0330363af4f, 3.16 | 8934d2889ae16a7c77520e002398d0689c1ecea5, d0596ee6c4b928a5c288790522a7495ee867da72, f526c218a149a30f110ce434ff17e033042404b8, d4008c3499dba7829bfe002edd99a8bff8ae3a7c, 91be5161f37b0a2795ad6806d69be5fa74522e5c, 57919d0662d8856211b794140172e51ca389f23d, 7b996cc06dda54c02a5aa607bda01109f0ac51e6, a653c01ce447f10c36b901646888c0330363af4f |
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