Unknown

CVE-2026-80886 — serial: msm: Disable DMA for kernel console UART

In the Linux kernel, the following vulnerability has been resolved: serial: msm: Disable DMA for kernel console UART At the moment, concurrent writes from userspace and the kernel to the console can trigger a race condition that results in an infinite loop of the same messages printed over and over again. This is most likely to happen during system startup or shutdown when the init system starts/stops a large number of system services that interact with various kernel code. When userspace writes to the TTY device, the driver initiates an asynchronous DMA transfer and releases the port lock. At the same moment, the kernel printk path might grab the port lock and re-configure the UART controller for PIO, without waiting for the DMA operation to complete. It seems like this collision results in zero progress being reported for the DMA engine, so the same text is printed to the console over and over again. For the kernel console, we want a reliable output path that will be functional even during crashes etc. So rather than implementing complex code to synchronize the kernel console write routines with the userspace DMA write routines, simply disable DMA for the console UART instance. Similar checks exist in many other serial drivers, e.g. 8250_port.c, imx.c, sh-sci.c etc.

Published Sep 4, 2026 · Updated Oct 15, 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)+2

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

0.22%

ahead of 12% of scored CVEs · Oct 26, 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	≥ 3a878c430fd6eb4f8587f9ebd187f773bf85d1d6 and < f58e568dc308c8e13f7730c8de2da5ed514e540d≥ 3a878c430fd6eb4f8587f9ebd187f773bf85d1d6 and < bb4296de5b538b575978c588cb3738ab8524d01a≥ 3a878c430fd6eb4f8587f9ebd187f773bf85d1d6 and < 6acea62738ed4cae6746483026706a773b44dad7≥ 3a878c430fd6eb4f8587f9ebd187f773bf85d1d6 and < abc1926c88c189e5d698b91ed6890e09ab5c321d≥ 3a878c430fd6eb4f8587f9ebd187f773bf85d1d6 and < 2727744ccb5ca59090451451ee94f530b1be04a5≥ 3a878c430fd6eb4f8587f9ebd187f773bf85d1d6 and < d354716245192de2d203f2b35f22ab8dc13595e2≥ 3a878c430fd6eb4f8587f9ebd187f773bf85d1d6 and < e3b42e326f4f30efcdc90bad5f5ba37e1cd91a47≥ 3a878c430fd6eb4f8587f9ebd187f773bf85d1d6 and < 22dd2777e6c180e1c945b00f6d18550979436324 and 1 more version 4.4	Vulnerable	CVE Program (cve.org) e CISA ADP

EPSS over time FIRST

Oct 15, 2026 → Oct 26, 2026 · 11 reading(s) · max 0.22%

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 15, 2026
Affected products added · linux/linux
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Received
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Sep 4, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

8 on the record

git.kernel.org/stable/c/22dd2777e6c180e1c945b00f6d18550979436324
NIST National Vulnerability Database
git.kernel.org/stable/c/e3b42e326f4f30efcdc90bad5f5ba37e1cd91a47
NIST National Vulnerability Database
git.kernel.org/stable/c/abc1926c88c189e5d698b91ed6890e09ab5c321d
NIST National Vulnerability Database
git.kernel.org/stable/c/6acea62738ed4cae6746483026706a773b44dad7
NIST National Vulnerability Database
git.kernel.org/stable/c/f58e568dc308c8e13f7730c8de2da5ed514e540d
NIST National Vulnerability Database
git.kernel.org/stable/c/bb4296de5b538b575978c588cb3738ab8524d01a
NIST National Vulnerability Database
git.kernel.org/stable/c/d354716245192de2d203f2b35f22ab8dc13595e2
NIST National Vulnerability Database
git.kernel.org/stable/c/2727744ccb5ca59090451451ee94f530b1be04a5
NIST National Vulnerability Database

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Unknown CVE-2026-99092 riscv: patch: fix handling of bpf-jit execmem addresses 15h
Unknown CVE-2026-99093 mm: don't schedule deferred kernel page table freeing while booting 15h
Unknown CVE-2026-99095 drm/vc4: drain the hangcheck timer and works on V3D unbind 15h
Unknown CVE-2026-99096 io_uring/register: don't exempt disabled rings from task restrictions 15h
Unknown CVE-2026-99097 tee: shm: reject zero-sized allocations in tee_dyn_shm_alloc_helper() 15h
Unknown CVE-2026-99098 dm-integrity: fix buffer overflow in inline mode with large tag size 15h

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-2026-80886 is "serial: msm: Disable DMA for kernel console UART", 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 0.22% 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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