pds_core: fix cmd_regs access racing BAR unmap on reset
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.6.158, 6.8, 6.12.111, 6.18.53, 7.2.7
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
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.
Timeline
- CVE published
- Record last updated
Affected versions
- Linux Linux
From f6ec6ac9432941ec85a2221c91b1ecfc85680d89 · fixed in 0bf9f3bae3c4b1eadb7a2bf63350333db7dac0d9; From e96094c1d11cce4deb5da3c0500d49041ab845b8 · fixed in 2cc697565fd19b5ba2d100cdd4a20dd6d263abc2; From e96094c1d11cce4deb5da3c0500d49041ab845b8 · fixed in fa31bd14c5042c6315bb2182c963f03ca6e79ca4; From e96094c1d11cce4deb5da3c0500d49041ab845b8 · fixed in 09f831bfe39de5b8026fefb3d106b5cc93272170; From e96094c1d11cce4deb5da3c0500d49041ab845b8 · fixed in 7980325b2f71e3f65c1323c39792e2455da6fab6; From 6.6.16 · fixed in 6.6.158; From 6.7.4 · fixed in 6.8
- Linux Linux
6.8
- KernelLinux
fixed in 6.6.158; From 6.7.0 · fixed in 6.12.111; From 6.8.0 · fixed in 6.18.53; From 6.13.0 · fixed in 7.2.7