{"id":"CVE-2026-98020","title":"In the Linux kernel, the following vulnerability has been resolved:\n\npds_core: fix cmd_regs access racing BAR unmap on reset\n\npdsc_reset_prepare() and pdsc_reset_done()'s pdsc_map_bars() error path\nclear/iounmap cmd_regs without devcmd_l…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\npds_core: fix cmd_regs access racing BAR unmap on reset\n\npdsc_reset_prepare() and pdsc_reset_done()'s pdsc_map_bars() error path\nclear/iounmap cmd_regs without devcmd_l…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= e96094c1d11cce4deb5da3c0500d49041ab845b8 < 2cc697565fd19b5ba2d100cdd4a20dd6d263abc2","Linux >= e96094c1d11cce4deb5da3c0500d49041ab845b8 < fa31bd14c5042c6315bb2182c963f03ca6e79ca4","Linux >= e96094c1d11cce4deb5da3c0500d49041ab845b8 < 09f831bfe39de5b8026fefb3d106b5cc93272170","Linux >= e96094c1d11cce4deb5da3c0500d49041ab845b8 < 7980325b2f71e3f65c1323c39792e2455da6fab6","Linux f6ec6ac9432941ec85a2221c91b1ecfc85680d89","Linux 692488941283d72362274620b9abd28109fc459f","Linux >= 6.6.16 < 6.7","Linux >= 6.7.4 < 6.8","Linux 6.8"],"published":"2026-09-25","updated":"2026-09-25","sourceUpdated":"2026-09-25T11:17:30.480","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-98020","references":[{"url":"https://git.kernel.org/stable/c/09f831bfe39de5b8026fefb3d106b5cc93272170","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/2cc697565fd19b5ba2d100cdd4a20dd6d263abc2","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7980325b2f71e3f65c1323c39792e2455da6fab6","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/fa31bd14c5042c6315bb2182c963f03ca6e79ca4","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-25T11:06:38.856Z","slug":"CVE-2026-98020","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\npds_core: fix cmd_regs access racing BAR unmap on reset\n\npdsc_reset_prepare() and pdsc_reset_done()'s pdsc_map_bars() error path\nclear/iounmap cmd_regs without devcmd_lock, and\npdsc_legacy_firmware_update()'s download loop derefs cmd_regs after\ndropping and retaking the lock without re-checking. An FLR concurrent\nwith a devlink flash can unmap cmd_regs under an in-flight devcmd,\ncausing a NULL deref or a write to unmapped MMIO.\n\nTake devcmd_lock across the BAR unmap/remap, and re-check cmd_regs in\nthe download loop. Only the PF maps cmd_regs and runs devcmd, so skip\nthe unmap on a VF, as pdsc_remove() and pdsc_reset_done() already do.\n\nA reset that completes entirely within the unlocked window is not a\ncorrectness problem for the image: the device clears its update session,\nso a resumed download is rejected, and it verifies the staged image\nbefore writing a flash slot, reporting PDS_RC_BAD_FW rather than\nactivating it.\n\npdsc_unmap_bars() also clears info_regs, intr_status and intr_ctrl. The\ninterrupt and start/stop readers of those are quiesced before the unmap\nby pdsc_fw_down(), which frees the interrupts and tears down the queues.\nThe debugfs readers are not, since those files outlive a reset; that is\npre-existing and out of scope here.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}