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CVE-2026-80583
ASoC: codecs: lpass-tx-macro: Fix enum kcontrol accesses
Published 2026-08-26 (2 months ago) by the Linux kernel CNA. Subsystem sound/soc. Debian urgency: not yet assigned.
What to do, per Debian release
Debian's own status for CVE-2026-80583 in every release this site tracks, and what each one means in practice. Every status below is the one the Debian Security Team publishes for this CVE. source
| Release | Status | Version | What this means |
|---|---|---|---|
| Debian 12bookworm | fixedDLA-4777-1 · 2026-09-08 · text | 6.1.187-1 | Update the kernel and reboot. DLA-4777-1 shipped the fix on 2026-09-08, in 6.1.187-1. A running kernel keeps the old code until the machine restarts. |
| Debian 13trixie | fixedDSA-6477-1 · 2026-08-29 · text | 6.12.107-1 | Update the kernel and reboot. DSA-6477-1 shipped the fix on 2026-08-29, in 6.12.107-1. A running kernel keeps the old code until the machine restarts. |
| Debian 14forky | fixed | 7.1.10-1 | Update the kernel and reboot. Fixed in 7.1.10-1. A running kernel keeps the old code until the machine restarts. |
| Debian unstablesid | fixed | 7.1.10-1 | Update the kernel and reboot. Fixed in 7.1.10-1. A running kernel keeps the old code until the machine restarts. |
| Debian 12bookworm · linux-6.12 | fixedDLA-4788-1 · 2026-09-19 · text | 6.12.107-1~deb12u1 | Update the kernel and reboot. DLA-4788-1 shipped the fix on 2026-09-19, in 6.12.107-1~deb12u1. A running kernel keeps the old code until the machine restarts. |
The vulnerability
What the bug is
The "DEC0 MODE" to "DEC7 MODE" controls are enumerated, but tx_macro_dec_mode_get() and tx_macro_dec_mode_put() access their value through ucontrol->value.integer.value[0] (a long) instead of ucontrol->value.enumerated.item[0] (an unsigned int). This same pattern was fixed in the sibling drivers by commit bcfe5f76cc40 ("ASoC: codecs: rx-macro: fix accessing array out of bounds for enum type") and commit 0ea5eff7c606 ("ASoC: codecs: va-macro: fix accessing array out of bounds for enum type"), but tx-macro was missed. On 64-bit kernels built with CONFIG_SND_CTL_DEBUG, the elem value sanity check catches the 4 bytes written past the enumerated item and every read of these controls fails with -EINVAL: snd-sm8250 sound: control 2:0:0:DEC0 MODE:0: access overflow
Where it lives
The fix touches these files. If the subsystem is one you do not use, the practical exposure is lower, though the package is still the vulnerable one.
sound/soc/codecs/lpass-tx-macro.c
- What this is
- QCOM AUDIO (ASoC) DRIVERSMAINTAINERS section matched on sound/soc/codecs/lpass-*.* · linux-sound@vger.kernel.org · Supported
- Kernel module
- snd_soc_lpass_tx_macro
Check it on the machine
grep -wE 'CONFIG_SND|CONFIG_SND_SOC|CONFIG_SND_SOC_LPASS_TX_MACRO' /boot/config-$(uname -r)Reads the booted kernel's own configuration, on the machine and nowhere else. =y is built in, =m is a module, and an is not set line means the code is not there.
lsmod | grep -w snd_soc_lpass_tx_macroPrints a line if that module is loaded right now, and nothing if it is not. One that is not loaded can still be loaded later by anything that needs it.
Show whether Debian builds this, per release
Debian does not build this code in 1 release. It does build it in 4 releases, so the answer depends on which release the machine runs.
- bookwormn
- trixieMnot built on amd64/amd64, amd64/cloud-amd64, amd64/rt/amd64, arm64/cloud-arm64, armel/rpi, armhf/armmp, armhf/armmp-lpae, armhf/rt/armmp, ppc64el/powerpc64le, ppc64el/powerpc64le-64k, riscv64/riscv64, s390x/s390x
- forky, sidMnot built on amd64/amd64, amd64/cloud-amd64, amd64/rt-amd64, arm64/cloud-arm64, armhf/armmp, armhf/armmp-lpae, loong64/loong64, ppc64el/powerpc64le, ppc64el/powerpc64le-64k, riscv64/riscv64, s390x/s390x
- bookworm · linux-6.12Mnot built on amd64/amd64, amd64/cloud-amd64, amd64/rt/amd64, arm64/cloud-arm64, armhf/armmp, armhf/armmp-lpae, armhf/rt/armmp, ppc64el/powerpc64le, ppc64el/powerpc64le-64k
- n
- not enabled on any flavour - this release does not build the code
- M
- a module where it is built at all; some flavours do not build it
- Build switches
- CONFIG_SND, CONFIG_SND_SOC, CONFIG_SND_SOC_LPASS_TX_MACRO
- Reads as
- all on means the file is compiled; any one off means it is not.
From the configuration Debian publishes for every kernel flavour it builds. It covers only the architectures Debian ships a linux-config package for, and nothing about a kernel you built yourself. Debian's own status above stays authoritative about the source package.MAINTAINERS kbuild Makefiles Debian linux-config packages
Signals
- Published
- 2026-08-26 (2 months ago)source
- CVSS
- 7.8 high
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:Hsource recompute it - Attack vector
- local (AV:L)source
- EPSS
- 0.18%, higher than 6.6% of all CVEssource
- CISA KEV
- not listedthe KEV catalogue
- Debian urgency
- not yet assignedsource
- Subsystem
- sound/soc
Upstream fixes
The versions the CNA records as introducing and fixing this, and the commit for each. source
| Introduced | Fixed in | Commit |
|---|---|---|
| 5.12 | 5.15.218 | dbc81b518f69 |
| 5.12 | 6.1.185 | f84f2c81d792 |
| 5.12 | 6.6.154 | 48b76879f5bf |
| 5.12 | 6.12.106 | 2ed3601e9db0 |
| 5.12 | 6.18.47 | b6baab796d11 |
| 5.12 | 7.1.10 | 3ee3c26ceee5 |
| 5.12 | 7.2 | 1ba381759e45 |
Debian advisories
| Advisory | Date | Shipped to | Debian |
|---|---|---|---|
| DLA-4788-1 | 2026-09-19 | bookworm 6.12.107-1~deb12u1 | tracker |
| DLA-4777-1 | 2026-09-08 | bookworm 6.1.187-1 | tracker |
| DSA-6477-1 | 2026-08-29 | trixie 6.12.107-1 | tracker |
Why the CNA scored it this way
Quoted from the kernel CNA's own scoring file, word for word. A highlighted metric carries the most severe value CVSS v3.1 defines for it, which is what pushes the score up. source
- AV:LAttack vector, local
- Exploitation requires local SNDRV_CTL_IOCTL_ELEM_READ or SNDRV_CTL_IOCTL_ELEM_WRITE on /dev/snd/controlC* through snd_ctl_ioctl() to tx_macro_dec_mode_get/put(); the Qualcomm LPASS TX macro audio codec driver has no network, Bluetooth, or physical-input attack path.
- AC:LAttack complexity, low
- A single ioctl targeting DEC0-7 MODE deterministically triggers the 8-byte integer access against a 4-byte enumerated field on 64-bit kernels; the attacker controls both sides with no race, timing, or memory-layout dependency.
- PR:LPrivileges required, low
- snd_ctl_open() performs no capability check; exploitation needs only local access to /dev/snd/controlC*, typically granted to the audio group on Qualcomm sc8250/sc8280 Chromebooks and Linux dev boards where this driver is present, not real root.
- UI:NUser interaction, none
- Once the attacker has ALSA control-device access they issue elem read/write ioctls themselves to DEC MODE controls; no separate victim action such as plugging hardware or opening a file is required.
- S:UScope, unchanged
- The out-of-bounds ctl-value access and resulting microphone ADC mode corruption remain within the host kernel and Qualcomm audio subsystem; there is no crossing of VM, container, or IOMMU security boundaries.
- C:HConfidentiality impact, high
- tx_macro_dec_mode_put() reads ucontrol->value.integer.value[0] (8 bytes) for ENUM controls, performing a 4-byte out-of-bounds read past enumerated.item[0]; per kernel CVSS guidance out-of-bounds reads are scored High even when bounded.
- I:HIntegrity impact, high
- tx_macro_dec_mode_get() writes 8 bytes via integer.value[0], overflowing enumerated.item[0] by 4 bytes in kernel memory; put stores values into tx->dec_mode[] that program CDC_TXn_ADC_MODE on phone/Chromebook microphones, constituting memory corruption scored High.
- A:HAvailability impact, high
- With CONFIG_SND_CTL_DEBUG every DEC0-7 MODE read fails with -EINVAL (access overflow), denying microphone ADC queries; on production 64-bit aarch64 builds the 4-byte union overrun corrupts ctl values and can break Qualcomm LPASS TX audio capture availability.