Unknown

CVE-2026-74654 — serial: 8250_dma: Clear stale RX state on shutdown

In the Linux kernel, the following vulnerability has been resolved: serial: 8250_dma: Clear stale RX state on shutdown serial8250_release_dma() terminates RX DMA and releases the channel, but leaves rx_running set. If the port is closed while an RX transfer is active, the stale state remains while rxchan is NULL until the channel is requested again on the next open. The DesignWare BUSY workaround added by commit a7b9ce39fbe4 ("serial: 8250_dw: Ensure BUSY is deasserted") calls serial8250_rx_dma_flush() from the LCR write path during startup. This happens before serial8250_request_dma() obtains a new RX channel. On reopen, the stale rx_running state therefore makes the flush path pass a NULL channel to dmaengine_pause(), causing a kernel Oops. Clear rx_running after terminating RX DMA, matching the TX cleanup. Also make the flush helper return if the DMA object or RX channel is not available so startup and teardown paths cannot pass a NULL channel to the DMAengine API.

Published Aug 22, 2026 · Updated Oct 14, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: Linux

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.2% (30-day exploitation probability)+1

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.18%

ahead of 7% of scored CVEs · Oct 14, 2026

Affects

Linux

CVSS base

—

Score not published yet.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Linux	Linux	≥ 0fcb7901f9d61a325b4c5b88c600383bcbeb97fe and < bf4fb620e02962b2b52500a4b3d8420f351eb46a≥ 0fcb7901f9d61a325b4c5b88c600383bcbeb97fe and < e10f06ee050a08930e2339b6fec7148fd0b2a8f6≥ 0fcb7901f9d61a325b4c5b88c600383bcbeb97fe and < d06cfb1add4a2d5b393e9e31f49ebbd168beea49≥ 0fcb7901f9d61a325b4c5b88c600383bcbeb97fe and < e7a5d792cf64a2096e18f1d573cc3d01cba15e92≥ 0fcb7901f9d61a325b4c5b88c600383bcbeb97fe and < 9f2444f4c0e4b06f61bae38da87c9c94c78efa86≥ 0fcb7901f9d61a325b4c5b88c600383bcbeb97fe and < ae05d9e50b6b9f246c110b3bdc03676145c2d0d4≥ 0fcb7901f9d61a325b4c5b88c600383bcbeb97fe and < e7e3cc6709caa49d1d6ce6c1f7cb305e38675cc9≥ 0fcb7901f9d61a325b4c5b88c600383bcbeb97fe and < e2fe6a0efecbef00e3ecc2db64dd5afa8c212b41 and 1 more version 3.19	Vulnerable	CVE Program (cve.org) e CISA ADP

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Not enough vector or weakness data: use the affected application’s logs as a starting point.

application logs

Timeline

What happened to this CVE, newest first.

2026
Record published
Oct 14, 2026
Affected products added · linux/linux
Oct 14, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Received
Oct 14, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 14, 2026 · NIST National Vulnerability Database
CVE published
Aug 22, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 14, 2026 – Oct 14, 2026

References

8 on the record

git.kernel.org/stable/c/e2fe6a0efecbef00e3ecc2db64dd5afa8c212b41
NIST National Vulnerability Database
git.kernel.org/stable/c/e7a5d792cf64a2096e18f1d573cc3d01cba15e92
NIST National Vulnerability Database
git.kernel.org/stable/c/e10f06ee050a08930e2339b6fec7148fd0b2a8f6
NIST National Vulnerability Database
git.kernel.org/stable/c/bf4fb620e02962b2b52500a4b3d8420f351eb46a
NIST National Vulnerability Database
git.kernel.org/stable/c/d06cfb1add4a2d5b393e9e31f49ebbd168beea49
NIST National Vulnerability Database
git.kernel.org/stable/c/ae05d9e50b6b9f246c110b3bdc03676145c2d0d4
NIST National Vulnerability Database
git.kernel.org/stable/c/e7e3cc6709caa49d1d6ce6c1f7cb305e38675cc9
NIST National Vulnerability Database
git.kernel.org/stable/c/9f2444f4c0e4b06f61bae38da87c9c94c78efa86
NIST National Vulnerability Database

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Critical CVE-2026-99999 ipv4: validate checksum_start before completing checksum 8h
Unknown CVE-2026-98432 ipv4: free inet_opt and ireq_opt after an RCU grace period 8h
Unknown CVE-2026-98428 ALSA: usb: 6fire: Avoid embedded URBs 1d
Unknown CVE-2026-98430 RDMA/efa: Keep admin queues alive while IRQ is registered 1d
Unknown CVE-2026-98429 RDMA/efa: Keep EQ resources alive while IRQ is registered 1d
Unknown CVE-2026-98427 net/sched: codel: bound the dropping loop per dequeue call 1d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No CVSS score published by NVD, the CNA, CISA or GitHub so far.
No fixed version, patch or mitigation documented.
No CISA SSVC assessment.
No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-74654 is "serial: 8250_dma: Clear stale RX state on shutdown", rated Unknown. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. EPSS 0.18% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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