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.

Gravité et risque d'exploitation

CVE-2026-98582 obtient un score CVSS de 0.0/10, soit une gravité non évaluée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.21 %, ce qui la place devant 10.6 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions 3096e25a3e40b73afd59e46f3bf8d84f919992a1, <f526c218a149a30f110ce434ff17e033042404b8, <=6.1.*, <8934d2889ae16a7c77520e002398d0689c1ecea5, <=6.12.*, 6.18.55, 0, <57919d0662d8856211b794140172e51ca389f23d, <7b996cc06dda54c02a5aa607bda01109f0ac51e6, <a653c01ce447f10c36b901646888c0330363af4f, 6.12.112, 5.10.271, 6.6.158, <=5.10.*, <=6.6.*, 6.1.189, <=6.18.*, 5.15.222, <91be5161f37b0a2795ad6806d69be5fa74522e5c, <=7.2.*, <d0596ee6c4b928a5c288790522a7495ee867da72, 7.2.9, <=*, <=5.15.*, 3.16, <3.16, <d4008c3499dba7829bfe002edd99a8bff8ae3a7c, 7.3) est présent sur votre parc.
• Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
• À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
• Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

• https://git.kernel.org/stable/c/8934d2889ae16a7c77520e002398d0689c1ecea5
• https://git.kernel.org/stable/c/d0596ee6c4b928a5c288790522a7495ee867da72
• https://git.kernel.org/stable/c/f526c218a149a30f110ce434ff17e033042404b8
• https://git.kernel.org/stable/c/d4008c3499dba7829bfe002edd99a8bff8ae3a7c
• https://git.kernel.org/stable/c/91be5161f37b0a2795ad6806d69be5fa74522e5c
• https://git.kernel.org/stable/c/57919d0662d8856211b794140172e51ca389f23d
• https://git.kernel.org/stable/c/7b996cc06dda54c02a5aa607bda01109f0ac51e6
• https://git.kernel.org/stable/c/a653c01ce447f10c36b901646888c0330363af4f