Answer in brief
CVE-2026-74655 records a High severity (CVSS 8.8) vulnerability in serial: qcom-geni: fix TX DMA buffer flush. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=2aaa43c7077833301c237684cd7bc9ae5e3dec95 <313ae287442e5e8d3f7b53b73f37d384bda072d0 || >=2aaa43c7077833301c237684cd7bc9ae5e3dec95 <1c31e2377f4c1bb110ca7f6e597b2253a7440c37 || >=2aaa43c7077833301c237684cd7bc9ae5e3dec95 <b1801c0d40f62778b613334de5840aba10a564d5 || >=2aaa43c7077833301c237684cd7bc9ae5e3dec95 <e3c04834ae1ab5e9cfbe8ac54ec734aa4774249d | 313ae287442e5e8d3f7b53b73f37d384bda072d0, 1c31e2377f4c1bb110ca7f6e597b2253a7440c37, b1801c0d40f62778b613334de5840aba10a564d5, e3c04834ae1ab5e9cfbe8ac54ec734aa4774249d |
| Linux/Linuxgeneric | 6.3 | Not reported |
| Linux/Linuxgeneric | >=2aaa43c7077833301c237684cd7bc9ae5e3dec95 <1606abb7ce8c0cfef98c7e556b83c14e5d73c1bf || >=2aaa43c7077833301c237684cd7bc9ae5e3dec95 <313ae287442e5e8d3f7b53b73f37d384bda072d0 || >=2aaa43c7077833301c237684cd7bc9ae5e3dec95 <1c31e2377f4c1bb110ca7f6e597b2253a7440c37 || >=2aaa43c7077833301c237684cd7bc9ae5e3dec95 <b1801c0d40f62778b613334de5840aba10a564d5 || >=2aaa43c7077833301c237684cd7bc9ae5e3dec95 <e3c04834ae1ab5e9cfbe8ac54ec734aa4774249d | 1606abb7ce8c0cfef98c7e556b83c14e5d73c1bf, 313ae287442e5e8d3f7b53b73f37d384bda072d0, 1c31e2377f4c1bb110ca7f6e597b2253a7440c37, b1801c0d40f62778b613334de5840aba10a564d5, e3c04834ae1ab5e9cfbe8ac54ec734aa4774249d |
Published upstream
Aug 22, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 27, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 22, 2026
In the Linux kernel, the following vulnerability has been resolved: serial: qcom-geni: fix TX DMA buffer flush When transmit flushing a qcom-geni UART during an ongoing TX DMA, the UART gets stuck infinitely repeating corrupted TX DMA frames. The DMA-mode uart_ops does not provide a flush_buffer callback, so an in-flight transfer can complete after serial core has reset the transmit kfifo, underflowing its length and resubmitting page-sized transfers indefinitely. Add one that stops the transfer and clears tx_remaining and tx_queued. The stop path was also broken: it unmapped the buffer while the serial engine could still read it, and never reset the TX DMA state machine. Cancel the main sequencer command first, then reset the state machine and wait for it before unmapping. Drop the early return so a pending mapping is also cleaned up when the main command is inactive. The bug can be triggered from userspace with a large write immediately followed by TCOFLUSH. A following tcdrain will hang forever. The bug was reproduced and this fix was validated on Arduino Uno Q (QRB2210) using /dev/ttyHS1.
Quoted source text, attributed separately from HOL analysis.