eth: fbnic: ring the doorbell if a burst ends in a drop
In the Linux kernel, the following vulnerability has been resolved: eth: fbnic: ring the doorbell if a burst ends in a drop fbnic_tx_map() skips the doorbell write, and the completion request, for every packet handed to it with xmit_more set, counting on the packet which ends the burst to publish them all. When that packet is dropped instead - skb_put_padto(), skb_cow_head() or a DMA mapping failure - nothing rings. The descriptors of the preceding packets stay invisible to the HW until the next transmit on that queue, which for a burst-then-idle workload may never come. Remember the meta descriptor of the last packet left without a doorbell and flush it from the error paths. The completion request has to be set on that descriptor rather than simply writing the tail, otherwise the HW would transmit the packets but never report a head, and the ring would fill up and stall for good. This is very similar to Joe's recent series of fixes for bnxt. Not seen in real life, reproduced under QEMU with failure injection.
CVE-2026-98277
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-2026-98277
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": "9a57bacd574b52b08bc2c600af6a8c7a87049ecf",
"lessThan": "60ef74357a36ed2a102a75bb68d37aa7f305b94e",
"versionType": "git"
},
{
"status": "affected",
"version": "9a57bacd574b52b08bc2c600af6a8c7a87049ecf",
"lessThan": "28fb764d670aa22dcbd2a02fd8fd87ae8d3563a9",
"versionType": "git"
},
{
"status": "affected",
"version": "9a57bacd574b52b08bc2c600af6a8c7a87049ecf",
"lessThan": "490599ab23134962a6d18a024e84541d77bdb999",
"versionType": "git"
}
],
"programFiles": [
"drivers/net/ethernet/meta/fbnic/fbnic_txrx.c",
"drivers/net/ethernet/meta/fbnic/fbnic_txrx.h"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.11"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.11",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.18.54",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.8",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/net/ethernet/meta/fbnic/fbnic_txrx.c",
"drivers/net/ethernet/meta/fbnic/fbnic_txrx.h"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98277
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38355 · Revision 1
- Added to Heist Feed
- Publisher date