serial: qcom-geni: do not advance stale DMA completions
In the Linux kernel, the following vulnerability has been resolved: serial: qcom-geni: do not advance stale DMA completions The qcom GENI serial DMA TX completion path advances the transmit fifo by the number of bytes recorded in port->tx_remaining. If uart_flush_buffer() runs after the hardware has completed a DMA transfer but before the DMA completion interrupt has been handled, the serial core resets the transmit fifo while port->tx_remaining still describes the old DMA transfer. A previous fix avoided advancing an empty fifo by checking that the fifo length is at least tx_remaining. That still does not distinguish the old DMA payload from new bytes written after the flush. If userspace writes new data before the stale DMA completion interrupt is handled, the fifo can again contain at least tx_remaining bytes and the stale completion can advance and discard those new bytes. Mark an in-flight DMA transfer stale when the transmit fifo is flushed. The later completion still unprepares the original DMA mapping using the saved length, but it no longer advances the transmit fifo.
CVE-2026-93123
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-2026-93123
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": "2aaa43c7077833301c237684cd7bc9ae5e3dec95",
"lessThan": "231c84fe7ec40e4a06c398c0591d5b8e823d68e1",
"versionType": "git"
},
{
"status": "affected",
"version": "2aaa43c7077833301c237684cd7bc9ae5e3dec95",
"lessThan": "c02d030747c46da33faf406dd772ef91100efa27",
"versionType": "git"
},
{
"status": "affected",
"version": "2aaa43c7077833301c237684cd7bc9ae5e3dec95",
"lessThan": "59faa59c25a0a098fbc86275408d7c8405015702",
"versionType": "git"
},
{
"status": "affected",
"version": "2aaa43c7077833301c237684cd7bc9ae5e3dec95",
"lessThan": "7ea38c49e7178960926657863299face6dc0e1b0",
"versionType": "git"
}
],
"programFiles": [
"drivers/tty/serial/qcom_geni_serial.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.3"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.3",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/tty/serial/qcom_geni_serial.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-93123
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #37847 · Revision 1
- Added to Heist Feed
- Publisher date