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pds_core: fix cmd_regs access racing BAR unmap on reset

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-98020

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-98020

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
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Prerequisites
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Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "f6ec6ac9432941ec85a2221c91b1ecfc85680d89",
        "lessThan": "0bf9f3bae3c4b1eadb7a2bf63350333db7dac0d9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e96094c1d11cce4deb5da3c0500d49041ab845b8",
        "lessThan": "2cc697565fd19b5ba2d100cdd4a20dd6d263abc2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e96094c1d11cce4deb5da3c0500d49041ab845b8",
        "lessThan": "fa31bd14c5042c6315bb2182c963f03ca6e79ca4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e96094c1d11cce4deb5da3c0500d49041ab845b8",
        "lessThan": "09f831bfe39de5b8026fefb3d106b5cc93272170",
        "versionType": "git"
      },
      {
        "status": "affected",
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        "lessThan": "7980325b2f71e3f65c1323c39792e2455da6fab6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "692488941283d72362274620b9abd28109fc459f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6.6.16",
        "lessThan": "6.6.158",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.7.4",
        "lessThan": "6.8",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "drivers/net/ethernet/amd/pds_core/fw.c",
      "drivers/net/ethernet/amd/pds_core/main.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6.8"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.8",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.158",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.111",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.53",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.7",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/net/ethernet/amd/pds_core/fw.c",
      "drivers/net/ethernet/amd/pds_core/main.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-98020

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#38146 · Revision 1
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Publisher date
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