Improper update of reference count in Linux kernel - CVE-2026-98344
Published: October 7, 2026
Vulnerability identifier: #VU153680
CSH Severity: Low
CVSS v4: 2 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-98344
CWE-ID: CWE-911
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper reference counting in dma_chan_put() in drivers/dma/dmaengine.c when releasing DMA channels acquired through the fast path. A local user can cycle dmaengine_get() and dmaengine_put() to cause a denial of service.
Exploitation requires a non-private DMA provider with a persistent client keeping chan->client_count greater than zero.
Affected software
Linux kernel
Debian Linux
linux (Debian package)
Debian Linux
linux (Debian package)
How to mitigate CVE-2026-98344
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3
linux (Debian package) - update to 6.12.113-1
linux (Debian package) - update to 6.12.113-1
External References
- https://git.kernel.org/stable/c/036b527f92570206da4b8c40b38f8d689e29d0f3
- https://git.kernel.org/stable/c/1a0d9b406febf23054ad595fd47b29325e70fb2d
- https://git.kernel.org/stable/c/44dab659064eb5c10adb0306510eebe848ed592d
- https://git.kernel.org/stable/c/57f7f1c6827be7d8f80feca48d2125fb91c6f6ed
- https://git.kernel.org/stable/c/5fb1797a8c9485e40e5492fa0338ab5c7d1f3fef
- https://git.kernel.org/stable/c/77906ac448d2fa81fa710ae26c0e591ebdc81154
- https://git.kernel.org/stable/c/7c3f4ce651d43705f9ec7f778f642a90d5ff4fba
- https://git.kernel.org/stable/c/de2677e57d3161390d8a508f08cddec6ef7e4b23