CVE-2026-98615
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.
Read full descriptionShow less
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.
CVSS
NVD hasn't assigned a CVSS score to this CVE (common since the April 2026 policy change).
Exploitation probability (EPSS)
- Probability of exploitation in the next 30 days
- 0.17 %
- Percentile among all scored CVEs
- 6
- Score date
- 10/20/2026
EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).
Affected technologies (1)
⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.
References
Show 4 references
Raw JSON (NVD)
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{
"id": "CVE-2026-98615",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"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",
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{
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"versionType": "git"
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{
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"version": "3b12f00ddd08e888273b2ac0488d396d90a836fc",
"lessThan": "8947f13e436a4ff5eed9f8f019b2865a07af4bb2",
"versionType": "git"
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{
"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"
}
]
}
],
"published": "2026-10-18T16:17:14.387",
"references": [
{
"url": "https://git.kernel.org/stable/c/8947f13e436a4ff5eed9f8f019b2865a07af4bb2",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/8a052cd4b2caee1f90cf0e3874377066939c90e7",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/a969db6548a1b046cd1423701f5f9c3f5794e90d",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/ed4163f6ba9b52bfd6216d5215ee7b8eb5072411",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\neth: fbnic: Set AW_FLUSH_MODE alongside AW_FLUSH when flushing the mailbox\n\nWhen tearing down the FW mailbox Rx ring, fbnic_mbx_reset_desc_ring()\nwrites AW_CFG with FLUSH set and everything else, BME included, cleared.\nClearing BME halts the device's writes to the host but leaves the staged\nrequests parked in the PUL write pipeline rather than draining them, so\non the write path FLUSH alone never terminates the outstanding requests\nand the flush the firmware waits on never completes.\n\nAdd the FLUSH_MODE definition and set both bits so the staged writes\ndrain out of the pipeline on their own. BME stays cleared, so nothing\nlands on the host; it is restored later in fbnic_mbx_init_desc_ring()\nwhen the ring is rebuilt, once the outstanding writes are gone.\n\nThe read path is unaffected. AR_CFG has no equivalent mode bit and\nAR_FLUSH terminates the outstanding reads by itself, so it is left as\nis.\n\nBoth writes remain plain stores rather than read-modify-writes. That is\ndeliberate: the matching write in fbnic_mbx_init_desc_ring() restores\nBME and the TLP attributes, and clears both flush bits as a side effect."
}
],
"lastModified": "2026-10-19T10:19:25.490",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}