CVE-2026-93042 json
dmaengine: dw-edma: Terminate all descriptors without callbacks
published 2026-09-17 52 d ago modified 2026-10-30 9 d ago also EUVD-2026-82152
- cvss
- 8.8
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 34%
- public exploits
- 0
- none known
Summary
In the Linux kernel, the following vulnerability has been resolved:
dmaengine: dw-edma: Terminate all descriptors without callbacks
The DMA Engine client documentation says in the "Terminate APIs" section of Documentation/driver-api/dmaengine/client.rst:
"No callback functions will be called for any incomplete transfers."
dw-edma instead calls vchan_cookie_complete() when a deferred STOP reaches the interrupt handler. This schedules a callback for the active descriptor and leaves other issued or submitted descriptors queued. A late callback after dmaengine_terminate_sync() can dereference client state that has already been freed, while leftover descriptors may later restart into reused buffers or leak.
Move all issued and submitted descriptors to the terminated list whenever termination completes. For a pending STOP, do this from both the DONE and ABORT paths. Complete their cookies in order without scheduling callbacks.
A STOP can remain pending until the running transfer raises an interrupt. Make device_synchronize() wait for such a pending STOP to complete before releasing terminated descriptors. Reuse it from free_chan_resources(), then release the remaining virt-dma resources. Sleep instead of busy-polling while waiting, and warn if the existing timeout expires.
Patch / fix
- Linux Linux 6.1.191, 6.6.157, 6.12.110, 6.18.52, 7.2.6, 7.3
- linux Debian 13 6.12.111-1
- linux Debian 14 7.2.6-1
- linux-6.12 Debian 12 6.12.111-1~deb12u1
debian advisories DEBIAN-CVE-2026-93042
- linux Ubuntu 26.04 LTS 7.0.0-42.42
- linux-aws Ubuntu 26.04 LTS 7.0.0-1016.17
- linux-gcp Ubuntu 26.04 LTS 7.0.0-1016.18
- linux-ibm Ubuntu 26.04 LTS 7.0.0-1017.17
- linux-riscv Ubuntu 26.04 LTS 7.0.0-42.42.1
- linux-oracle Ubuntu 26.04 LTS 7.0.0-1015.16
- linux-hwe-7.0 Ubuntu 24.04 LTS 7.0.0-42.42~24.04.1
- linux-oem-7.0 Ubuntu 26.04 LTS 7.0.0-1017.17
ubuntu advisories UBUNTU-CVE-2026-93042
Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
- kernel-source openSUSE Tumbleweed 7.2.8-1.1
opensuse advisories openSUSE-SU-2026:11893-1
- kernel Azure Linux 3.0 6.6.157.1-1
azure linux advisories AZL-101988
Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT
- git.kernel.org/stable/c/da56839aced48ecb70033962d7ea98f55b0c5656 commit
- git.kernel.org/stable/c/65e387b95d3855aa894ac729e1778e5bcb9083cb commit
- git.kernel.org/stable/c/4793f9099a1cadf4e37f3a03d524af6bce88a0ea commit
- git.kernel.org/stable/c/be87d86537de7ea6fd025f41033d2faff880973f commit
- git.kernel.org/stable/c/f3ec6702a1d216be61f692cc0a983d6c8fb5ebf7 commit
- git.kernel.org/stable/c/99109a51efd28c9a661fbfb9469b023c517b31d1 commit
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2026-93042 updated cvss 5.5
kernel: dmaengine: dw-edma: Terminate all descriptors without callbacks
-
Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 more Red Hat Enterprise Linux 10 kernel Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9not affected: vulnerable code not present
+1 more productsfewer
Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
Exploit prediction
0.40% chance of exploitation in the next 30 days, higher than 34% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 8.8 | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
- Linux Linux
Classification
- Technology feeds
References
- git.kernel.org /stable/c/da56839aced48ecb70033962d7ea98f55b0c5656
- git.kernel.org /stable/c/65e387b95d3855aa894ac729e1778e5bcb9083cb
- git.kernel.org /stable/c/4793f9099a1cadf4e37f3a03d524af6bce88a0ea
- git.kernel.org /stable/c/be87d86537de7ea6fd025f41033d2faff880973f
- git.kernel.org /stable/c/f3ec6702a1d216be61f692cc0a983d6c8fb5ebf7
- git.kernel.org /stable/c/99109a51efd28c9a661fbfb9469b023c517b31d1
Sources
- CVE List CVE-2026-93042
- NVD CVE-2026-93042
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.