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wifi: brcmfmac: make release_scratchbuffers idempotent

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: wifi: brcmfmac: make release_scratchbuffers idempotent brcmf_pcie_release_scratchbuffers() frees the shared.scratch and shared.ringupd DMA buffers with dma_free_coherent() but does not clear the pointers afterwards, unlike the sibling release_ringbuffers() which NULLs commonrings/flowrings/idxbuf on release. Both the bus_reset .reset callback (brcmf_pcie_reset) and brcmf_pcie_remove() call release_scratchbuffers. When reset teardown has run before removal, remove's own teardown would call dma_free_coherent() a second time on the already-freed DMA allocation. NULL the pointers after free, matching release_ringbuffers(), so a later release observes that the allocation has already been released. This patch makes repeated sequential release safe; the reset-work lifetime is handled separately by the following patch. This issue was found by an in-house static analysis tool.

Announced Source revision 1
Original source ↗

CVE-2026-68192

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-2026-68192

Linux

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

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

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": "4684997d9eea29380000e062755aa6d368d789a3",
        "lessThan": "81c58a206d1deee01f4c29236d4154c0872f2a38",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4684997d9eea29380000e062755aa6d368d789a3",
        "lessThan": "382ee00b2d1e31869ae576a60d3fbe7a2153512f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4684997d9eea29380000e062755aa6d368d789a3",
        "lessThan": "739b686aecdb14a6065300ea53401f043e51fd22",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4684997d9eea29380000e062755aa6d368d789a3",
        "lessThan": "b7d1d8cb1bdca56aecebacd2896615da0acc126a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4684997d9eea29380000e062755aa6d368d789a3",
        "lessThan": "5a045c2f0fbf029873d2295178fa0785ade35af0",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4684997d9eea29380000e062755aa6d368d789a3",
        "lessThan": "044fca8f45ba9ab6ca526163155234cf88287ff5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4684997d9eea29380000e062755aa6d368d789a3",
        "lessThan": "0ca80328df23f851c86866720d4977783c919ee6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4684997d9eea29380000e062755aa6d368d789a3",
        "lessThan": "538c51e9d124cf656f2dd0c0394a8545efc7102d",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.2"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.2",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.265",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.216",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.183",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.148",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.101",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.42",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-68192

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#41151 · Revision 1
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Publisher date
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