CVE-2026-98020
- Source
- https://cve.org/CVERecord?id=CVE-2026-98020
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98020.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-98020
- Downstream
- Related
- Published
- 2026-09-25T10:23:40Z
- Modified
- 2026-10-09T17:26:55Z
- Summary
- pds_core: fix cmd_regs access racing BAR unmap on reset
- Details
-
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.
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98020.json" }- References
-
- https://git.kernel.org/stable/c/09f831bfe39de5b8026fefb3d106b5cc93272170
- https://git.kernel.org/stable/c/0bf9f3bae3c4b1eadb7a2bf63350333db7dac0d9
- https://git.kernel.org/stable/c/2cc697565fd19b5ba2d100cdd4a20dd6d263abc2
- https://git.kernel.org/stable/c/7980325b2f71e3f65c1323c39792e2455da6fab6
- https://git.kernel.org/stable/c/fa31bd14c5042c6315bb2182c963f03ca6e79ca4
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98020.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-98020
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedf6ec6ac9432941ec85a2221c91b1ecfc85680d89Fixed0bf9f3bae3c4b1eadb7a2bf63350333db7dac0d9
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducede96094c1d11cce4deb5da3c0500d49041ab845b8Fixed2cc697565fd19b5ba2d100cdd4a20dd6d263abc2Fixedfa31bd14c5042c6315bb2182c963f03ca6e79ca4Fixed09f831bfe39de5b8026fefb3d106b5cc93272170Fixed7980325b2f71e3f65c1323c39792e2455da6fab6
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced6.6.16Fixed6.6.158
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced6.7.4Fixed6.8
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced692488941283d72362274620b9abd28109fc459f
Affected versions
v6.*
Linux / Kernel
Package
- Name
- Kernel