{"schema":"threatline.record/2","record":{"id":"CVE-2026-98020","aliases":[],"summary":"pds_core: fix cmd_regs access racing BAR unmap on reset","details":"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_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.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98020","source_modified_at":"2026-10-19T09:12:25.476Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"f6ec6ac9432941ec85a2221c91b1ecfc85680d89","lessThan":"0bf9f3bae3c4b1eadb7a2bf63350333db7dac0d9","status":"affected","versionType":"git"},{"version":"e96094c1d11cce4deb5da3c0500d49041ab845b8","lessThan":"2cc697565fd19b5ba2d100cdd4a20dd6d263abc2","status":"affected","versionType":"git"},{"version":"e96094c1d11cce4deb5da3c0500d49041ab845b8","lessThan":"fa31bd14c5042c6315bb2182c963f03ca6e79ca4","status":"affected","versionType":"git"},{"version":"e96094c1d11cce4deb5da3c0500d49041ab845b8","lessThan":"09f831bfe39de5b8026fefb3d106b5cc93272170","status":"affected","versionType":"git"},{"version":"e96094c1d11cce4deb5da3c0500d49041ab845b8","lessThan":"7980325b2f71e3f65c1323c39792e2455da6fab6","status":"affected","versionType":"git"},{"version":"692488941283d72362274620b9abd28109fc459f","status":"affected","versionType":"git"},{"version":"6.6.16","lessThan":"6.6.158","status":"affected","versionType":"semver"},{"version":"6.7.4","lessThan":"6.8","status":"affected","versionType":"semver"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98020","source_modified_at":"2026-10-19T09:12:25.476Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"6.8","status":"affected"},{"version":"0","lessThan":"6.8","status":"unaffected","versionType":"semver"},{"version":"6.6.158","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.111","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.53","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.7","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98020","source_modified_at":"2026-10-19T09:12:25.476Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"0bf9f3bae3c4b1eadb7a2bf63350333db7dac0d9","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98020","source_modified_at":"2026-10-19T09:12:25.476Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"2cc697565fd19b5ba2d100cdd4a20dd6d263abc2","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98020","source_modified_at":"2026-10-19T09:12:25.476Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"09f831bfe39de5b8026fefb3d106b5cc93272170","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98020","source_modified_at":"2026-10-19T09:12:25.476Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"7980325b2f71e3f65c1323c39792e2455da6fab6","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98020","source_modified_at":"2026-10-19T09:12:25.476Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"6.6.158","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98020","source_modified_at":"2026-10-19T09:12:25.476Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"6.8","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.00168,"percentile":0.05733,"score_date":"2026-10-23"},"published_at":"2026-09-25T10:23:40.900Z","modified_at":"2026-10-19T09:12:25.476Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98020","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:12:25.476Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98020","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/0bf9f3bae3c4b1eadb7a2bf63350333db7dac0d9"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/2cc697565fd19b5ba2d100cdd4a20dd6d263abc2"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/fa31bd14c5042c6315bb2182c963f03ca6e79ca4"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/09f831bfe39de5b8026fefb3d106b5cc93272170"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/7980325b2f71e3f65c1323c39792e2455da6fab6"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-19T09:12:25.476Z","content_hash":"bdbd16aa16c498bdb4d4017b8e201fc0eb96732f8153c2d0f447b4aaf9c032ef"}}