CVE-2026-74498: Linux kernel · ALSA: usb-audio: Fix DMA buffer out-of-bounds write when fill_max is set
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in f9b6c9576568169139ac151f7881474f384659fd : patch Linux kernel soon.
Data as of 6 Nov 2026, 17:56 UTC
Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD
Thin evidence
One scorer or none- CISA SSVC
- Exploitation
- No evidence of active exploitation and no public proof of concept
- Automatable
- Attackers cannot reliably automate steps 1–4 of the kill chain
- Technical impact
- Limited control over the software or limited information exposure
CISA SSVC assessment, 2026-11-06.
- Patch
- Available – fixed in f9b6c9576568169139ac151f7881474f384659fd, d0199ae1666ff9ae2d1d568d64c3430d4c47f0e5, bd65b7191683bebd9923904f0558b9211b9129da +5
Exploitation evidence
Disclosed: evidence found.
CVE published 15 Aug 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
| LinuxLinux | Affected
| Fixed in
|
AI-suggested
A fix is available and has been applied in the Linux kernel versions identified by the provided commit hashes. Users should update to a fixed Linux kernel version containing these commits to remediate the vulnerability.
Description
A vulnerability in the Linux kernel ALSA usb-audio driver caused an out-of-bounds DMA buffer write when the fill_max flag was set. This occurred because the DMA buffer was allocated based on an incorrect size, leading to potential kernel heap memory corruption during USB audio data transfers. The issue has been fixed by updating the buffer size calculation to match the actual transfer size when fill_max is set.
References
- git.kernel.org/stable/c/10c24e6fddf4bdff0b6b05a47a4347b38e6960e8 (opens in a new tab)
- git.kernel.org/stable/c/b1770f9ac35c0ffc34914d52347c65dcd5ac049b (opens in a new tab)
- git.kernel.org/stable/c/6cbdd11f9b05b92f4aa29f09a66e19ed0e25e66c (opens in a new tab)
- git.kernel.org/stable/c/3852974608f53e530e27c21d0c6c7d79c17b3f5a (opens in a new tab)
- git.kernel.org/stable/c/f9b6c9576568169139ac151f7881474f384659fd (opens in a new tab)
- git.kernel.org/stable/c/04595233e5606d452f9f47e6989fc7ae7440fd40 (opens in a new tab)
- git.kernel.org/stable/c/bd65b7191683bebd9923904f0558b9211b9129da (opens in a new tab)
- git.kernel.org/stable/c/d0199ae1666ff9ae2d1d568d64c3430d4c47f0e5 (opens in a new tab)