CVE-2026-98020

Description

In the Linux kernel, the following vulnerability has been resolved: pds_core: fix cmd_regs access racing BAR unmap on reset pdsc_reset_prepare() and pdsc_reset_done()'s pdsc_map_bars() error path clear/iounmap cmd_regs without devcmd_lock, and pdsc_legacy_firmware_update()'s download loop derefs cmd_regs after dropping and retaking the lock without re-checking. An FLR concurrent with a devlink flash can unmap cmd_regs under an in-flight devcmd, causing a NULL deref or a write to unmapped MMIO. Take devcmd_lock across the BAR unmap/remap, and re-check cmd_regs in the download loop. Only the PF maps cmd_regs and runs devcmd, so skip the unmap on a VF, as pdsc_remove() and pdsc_reset_done() already do. A reset that completes entirely within the unlocked window is not a correctness problem for the image: the device clears its update session, so a resumed download is rejected, and it verifies the staged image before writing a flash slot, reporting PDS_RC_BAD_FW rather than activating it. pdsc_unmap_bars() also clears info_regs, intr_status and intr_ctrl. The interrupt and start/stop readers of those are quiesced before the unmap by pdsc_fw_down(), which frees the interrupts and tears down the queues. The debugfs readers are not, since those files outlive a reset; that is pre-existing and out of scope here.

Gravité et risque d'exploitation

CVE-2026-98020 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 0.17 %, ce qui la place devant 5.7 % des CVE référencées.

Que faire ?

• Vérifiez si Linux (versions <=6.12.*, 7.2.7, 6.18.53, 0, <09f831bfe39de5b8026fefb3d106b5cc93272170, 692488941283d72362274620b9abd28109fc459f, 6.8, <6.8, 6.6.158, <=6.6.*, <6.6.158, <2cc697565fd19b5ba2d100cdd4a20dd6d263abc2, <=6.18.*, 6.6.16, 6.7.4, <0bf9f3bae3c4b1eadb7a2bf63350333db7dac0d9, 7.3, <=7.2.*, <7980325b2f71e3f65c1323c39792e2455da6fab6, <=*, e96094c1d11cce4deb5da3c0500d49041ab845b8, f6ec6ac9432941ec85a2221c91b1ecfc85680d89, 6.12.111, <fa31bd14c5042c6315bb2182c963f03ca6e79ca4) 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/0bf9f3bae3c4b1eadb7a2bf63350333db7dac0d9
• https://git.kernel.org/stable/c/2cc697565fd19b5ba2d100cdd4a20dd6d263abc2
• https://git.kernel.org/stable/c/fa31bd14c5042c6315bb2182c963f03ca6e79ca4
• https://git.kernel.org/stable/c/09f831bfe39de5b8026fefb3d106b5cc93272170
• https://git.kernel.org/stable/c/7980325b2f71e3f65c1323c39792e2455da6fab6