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eth: fbnic: Set AW_FLUSH_MODE alongside AW_FLUSH when flushing the mailbox

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: eth: fbnic: Set AW_FLUSH_MODE alongside AW_FLUSH when flushing the mailbox When tearing down the FW mailbox Rx ring, fbnic_mbx_reset_desc_ring() writes AW_CFG with FLUSH set and everything else, BME included, cleared. Clearing BME halts the device's writes to the host but leaves the staged requests parked in the PUL write pipeline rather than draining them, so on the write path FLUSH alone never terminates the outstanding requests and the flush the firmware waits on never completes. Add the FLUSH_MODE definition and set both bits so the staged writes drain out of the pipeline on their own. BME stays cleared, so nothing lands on the host; it is restored later in fbnic_mbx_init_desc_ring() when the ring is rebuilt, once the outstanding writes are gone. The read path is unaffected. AR_CFG has no equivalent mode bit and AR_FLUSH terminates the outstanding reads by itself, so it is left as is. Both writes remain plain stores rather than read-modify-writes. That is deliberate: the matching write in fbnic_mbx_init_desc_ring() restores BME and the TLP attributes, and clears both flush bits as a side effect.

Announced Source revision 1
Original source ↗

CVE-2026-98615

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-2026-98615

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": "fea860a2a6136658708fb530a82d59d29f708b74",
        "lessThan": "ed4163f6ba9b52bfd6216d5215ee7b8eb5072411",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3b12f00ddd08e888273b2ac0488d396d90a836fc",
        "lessThan": "8a052cd4b2caee1f90cf0e3874377066939c90e7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3b12f00ddd08e888273b2ac0488d396d90a836fc",
        "lessThan": "a969db6548a1b046cd1423701f5f9c3f5794e90d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3b12f00ddd08e888273b2ac0488d396d90a836fc",
        "lessThan": "8947f13e436a4ff5eed9f8f019b2865a07af4bb2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0a4aa8a32ddb96f320173a2e9b0e41f4a6d3746c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "6.12.29",
        "lessThan": "6.12.112",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "6.14.7",
        "lessThan": "6.15",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "drivers/net/ethernet/meta/fbnic/fbnic_csr.h",
      "drivers/net/ethernet/meta/fbnic/fbnic_fw.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6.15"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.15",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.12.112",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.55",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.9",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/net/ethernet/meta/fbnic/fbnic_csr.h",
      "drivers/net/ethernet/meta/fbnic/fbnic_fw.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-98615

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#38635 · Revision 1
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