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CVE-2026-98582

Unknown

Last modified

CVE-2026-98582 is a vulnerability of currently unknown severity. 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.

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.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 3096e25a3e40b73afd59e46f3bf8d84f919992a1, < 8934d2889ae16a7c77520e002398d0689c1ecea5; >= 3096e25a3e40b73afd59e46f3bf8d84f919992a1, < d0596ee6c4b928a5c288790522a7495ee867da72; >= 3096e25a3e40b73afd59e46f3bf8d84f919992a1, < f526c218a149a30f110ce434ff17e033042404b8; >= 3096e25a3e40b73afd59e46f3bf8d84f919992a1, < d4008c3499dba7829bfe002edd99a8bff8ae3a7c; >= 3096e25a3e40b73afd59e46f3bf8d84f919992a1, < 91be5161f37b0a2795ad6806d69be5fa74522e5c; >= 3096e25a3e40b73afd59e46f3bf8d84f919992a1, < 57919d0662d8856211b794140172e51ca389f23d; >= 3096e25a3e40b73afd59e46f3bf8d84f919992a1, < 7b996cc06dda54c02a5aa607bda01109f0ac51e6; >= 3096e25a3e40b73afd59e46f3bf8d84f919992a1, < a653c01ce447f10c36b901646888c0330363af4f
LinuxLinux3.16

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-98582?
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 severe is CVE-2026-98582?
Severity scoring for CVE-2026-98582 is pending analysis.
How do I fix CVE-2026-98582?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST