CVE-2026-43279: ALSA: usb-audio: Add sanity check for OOB writes at silencing
Vulnerability summary
CVE-2026-43279 is a high (CVSS 7.8) Out-of-bounds Write vulnerability in linux. EPSS estimates a 0.12% chance of exploitation in the next 30 days, higher than 2% of scored vulnerabilities.
Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 50 · Related 38Timeline
- 06-05-2026PublishedVulnerability first disclosed.
- 19-10-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Add sanity check for OOB writes at silencing At silencing the playback URB packets in the implicit fb mode before the actual playback, we blindly assume that the received packets fit with the buffer size. But when the setup in the capture stream differs from the playback stream (e.g. due to the USB core limitation of max packet size), such an inconsistency may lead to OOB writes to the buffer, resulting in a crash. For addressing it, add a sanity check of the transfer buffer size at prepare_silent_urb(), and stop the data copy if the received data overflows. Also, report back the transfer error properly from there, too. Note that this doesn't fix the root cause of the playback error itself, but this merely covers the kernel Oops.
CVSS metrics
6 scores · 5 sources · 2 versions- OSV · Red hatEcosystem advisory · calculated5.8MediumCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:HDiffers
- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- NVDNIST7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.12%
Chance of exploitation in the next 30 days
Percentile
2%
Versus all other CVEs
30-day change
Decrease -0.05 pp
From 0.18% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu157 products
- linuxAll versions (No fix recorded) | < 5.15.0-186.196 | < 6.8.0-134.134
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 5.15.0-1112.119 | < 6.8.0-1060.63
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Redhat37 products
- bpftool< 0:3.10.0-1160.157.1.el7
- bpftool-debuginfo< 0:3.10.0-1160.157.1.el7
- kernel< 0:3.10.0-1160.157.1.el7
- kernel-abi-whitelists< 0:3.10.0-1160.157.1.el7
- kernel-bootwrapper< 0:3.10.0-1160.157.1.el7
Linux2 products
- linux≥ c75a8a7ae565d7cd9baa87a504ba9162e355b4b0, < fa01973bb79d70c4736b6a4b2de99fbb2cbc8d1f | ≥ c75a8a7ae565d7cd9baa87a504ba9162e355b4b0, < 780dc57794a217b49994fa1d0b42465fb10a00aa | ≥ c75a8a7ae565d7cd9baa87a504ba9162e355b4b0, < 8995fc0e00b3fee9bf7ecb3d836b635b730c1049 | ≥ c75a8a7ae565d7cd9baa87a504ba9162e355b4b0, < fc9e5af60dc199051dc202ae78e1fe76a9977a5e | ≥ c75a8a7ae565d7cd9baa87a504ba9162e355b4b0, < 6af16f1b8649df4c00d6ced924bdd8b72c885b6a | ≥ c75a8a7ae565d7cd9baa87a504ba9162e355b4b0, < ccaf9296763be4f76b59e2cac377006016c34435 | ≥ c75a8a7ae565d7cd9baa87a504ba9162e355b4b0, < fba2105a157fffcf19825e4eea498346738c9948 | 3.5
- linux_kernel≥ 3.5, < 5.15.202 | ≥ 5.16, < 6.1.165 | ≥ 6.2, < 6.6.128 | ≥ 6.7, < 6.12.75 | ≥ 6.13, < 6.18.16 | ≥ 6.19, < 6.19.6
Debian1 product
- linux< 6.1.170-1 | < 6.12.85-1 | < 6.19.6-1
4 vendors · 197 products
