CVE-2026-31778: ALSA: caiaq: fix stack out-of-bounds read in init_card

Q: What is the severity of CVE-2026-31778?

CVE-2026-31778 has a moderate severity level due to the potential for stack out-of-bounds read issues that can lead to information disclosure.

Q: How do I fix CVE-2026-31778?

To resolve CVE-2026-31778, update the ALSA snd_usb_caiaq driver to the latest version that contains the patch for this vulnerability.

Q: What systems are affected by CVE-2026-31778?

CVE-2026-31778 affects the Linux Kernel ALSA snd_usb_caiaq driver starting from version 2.6.31-rc1.

Q: What is the potential impact of CVE-2026-31778?

The potential impact of CVE-2026-31778 includes unauthorized access to sensitive information due to the out-of-bounds read.

Q: Is CVE-2026-31778 a remote attack vector?

No, CVE-2026-31778 is not a remote attack vector; it requires local access to exploit the vulnerability.

Published May 1, 2026

Updated

In the Linux kernel, the following vulnerability has been resolved:

ALSA: caiaq: fix stack out-of-bounds read in initcard

The loop creates a whitespace-stripped copy of the card shortname where len < sizeof(card->id) is used for the bounds check. Since sizeof(card->id) is 16 and the local id buffer is also 16 bytes, writing 16 non-space characters fills the entire buffer, overwriting the terminating nullbyte.

When this non-null-terminated string is later passed to sndcardsetid() -> copyvalididstring(), the function scans forward with while (nid && ...) and reads past the end of the stack buffer, reading the contents of the stack.

A USB device with a product name containing many non-ASCII, non-space characters (e.g. multibyte UTF-8) will reliably trigger this as follows:

BUG: KASAN: stack-out-of-bounds in copyvalididstring sound/core/init.c:696 [inline] BUG: KASAN: stack-out-of-bounds in sndcardsetidnolock+0x698/0x74c sound/core/init.c:718

The off-by-one has been present since commit bafeee5b1f8d ("ALSA: sndusbcaiaq: give better shortname") from June 2009 (v2.6.31-rc1), which first introduced this whitespace-stripping loop. The original code never accounted for the null terminator when bounding the copy.

Fix this by changing the loop bound to sizeof(card->id) - 1, ensuring at least one byte remains as the null terminator.

Affected Software

269 affected componentsFixes available

The Linux Foundation ALSA snd_usb_caiaq (caiaq) driver>=2.6.31-rc1

Linux Linux kernel>=2.6.31<5.10.253

Linux Linux kernel>=5.11<5.15.203

Linux Linux kernel>=5.16<6.1.168

Linux Linux kernel>=6.2<6.6.134

Linux Linux kernel>=6.7<6.12.81

Linux Linux kernel>=6.13<6.18.22

Linux Linux kernel>=6.19<6.19.12

Linux Linux kernel=7.0-rc1

Linux Linux kernel=7.0-rc2

Linux Linux kernel=7.0-rc3

Linux Linux kernel=7.0-rc4

Linux Linux kernel=7.0-rc5

Linux Linux kernel=7.0-rc6

linux/kernel>=2.6.31<5.10.253

5.10.253

linux/kernel>=5.11.0<5.15.203

5.15.203

linux/kernel>=5.16.0<6.1.168

6.1.168

linux/kernel>=6.2.0<6.6.134

6.6.134

linux/kernel>=6.7.0<6.12.81

6.12.81

linux/kernel>=6.13.0<6.18.22

6.18.22

linux/kernel>=6.19.0<6.19.12

6.19.12

ubuntu/linux*

ubuntu/linux-aws*

ubuntu/linux-azure*

ubuntu/linux-lts-xenial*

ubuntu/linux*

ubuntu/linux-aws*

ubuntu/linux-aws-hwe*

ubuntu/linux-azure*

ubuntu/linux-gcp*

ubuntu/linux-hwe*

ubuntu/linux-hwe-edge*

ubuntu/linux-kvm*

ubuntu/linux-oracle*

ubuntu/linux-fips*

ubuntu/linux*

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ubuntu/linux-aws-5.0*

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ubuntu/linux-azure-4.15*

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ubuntu/linux-gke<5.15.0-1108.114

5.15.0-1108.114

ubuntu/linux-gkeop<5.15.0-1095.103

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ubuntu/linux-hwe-5.19*

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ubuntu/linux-ibm<5.15.0-1106.110

5.15.0-1106.110

ubuntu/linux-ibm-6.8<6.8.0-1061.62~22.04.1

6.8.0-1061.62~22.04.1

ubuntu/linux-intel-iot-realtime*

ubuntu/linux-intel-iotg<5.15.0-1107.113

5.15.0-1107.113

ubuntu/linux-kvm<5.15.0-1104.109

5.15.0-1104.109

ubuntu/linux-lowlatency<5.15.0-184.194

5.15.0-184.194

ubuntu/linux-lowlatency-hwe-5.19*

ubuntu/linux-lowlatency-hwe-6.2*

ubuntu/linux-lowlatency-hwe-6.5*

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6.8.0-136.136.2~22.04.1

ubuntu/linux-nvidia<5.15.0-1107.108

5.15.0-1107.108

ubuntu/linux-nvidia-6.2*

ubuntu/linux-nvidia-6.5*

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6.8.0-1059.62~22.04.1

ubuntu/linux-nvidia-tegra<5.15.0-1064.66

5.15.0-1064.66

ubuntu/linux-nvidia-tegra-igx<5.15.0-1053.53

5.15.0-1053.53

ubuntu/linux-oem-5.17*

ubuntu/linux-oem-6.0*

ubuntu/linux-oem-6.1*

ubuntu/linux-oem-6.5*

ubuntu/linux-oracle<5.15.0-1109.115

5.15.0-1109.115

ubuntu/linux-oracle-6.5*

ubuntu/linux-oracle-6.8<6.8.0-1058.61~22.04.1

6.8.0-1058.61~22.04.1

ubuntu/linux-raspi<5.15.0-1106.109

5.15.0-1106.109

ubuntu/linux-realtime*

ubuntu/linux-riscv*

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ubuntu/linux-starfive-5.19*

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ubuntu/linux-starfive-6.5*

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ubuntu/linux-aws-6.14*

ubuntu/linux-aws-6.17*

ubuntu/linux-azure<6.8.0-1063.71

6.8.0-1063.71

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ubuntu/linux-azure-fde<6.8.0-1062.69

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ubuntu/linux-azure-fde-6.14*

ubuntu/linux-azure-nvidia*

ubuntu/linux-azure-nvidia-6.14*

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ubuntu/linux-gkeop<6.8.0-1046.50

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ubuntu/linux-hwe-6.14*

ubuntu/linux-hwe-6.17*

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ubuntu/linux-lowlatency<6.8.0-136.136.2

6.8.0-136.136.2

ubuntu/linux-lowlatency-hwe-6.11*

ubuntu/linux-nvidia<6.8.0-1059.62

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ubuntu/linux-nvidia-6.17*

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ubuntu/linux-nvidia-tegra<6.8.0-1030.31

6.8.0-1030.31

ubuntu/linux-oem-6.11*

ubuntu/linux-oem-6.14*

ubuntu/linux-oem-6.17*

ubuntu/linux-oem-6.8*

ubuntu/linux-oracle<6.8.0-1058.61

6.8.0-1058.61

ubuntu/linux-oracle-6.14*

ubuntu/linux-oracle-6.17*

ubuntu/linux-raspi<6.8.0-1061.65

6.8.0-1061.65

ubuntu/linux-raspi-realtime*

ubuntu/linux-realtime*

ubuntu/linux-riscv*

ubuntu/linux-riscv-6.14*

ubuntu/linux-riscv-6.17*

ubuntu/linux-vmware<6.8.0-1008.8

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ubuntu/linux-xilinx<6.8.0-1033.34

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ubuntu/linux-bluefield<6.8.0-1028.33

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ubuntu/linux-realtime-6.14*

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ubuntu/linux*

ubuntu/linux-aws*

ubuntu/linux-azure*

ubuntu/linux-azure-fde*

ubuntu/linux-gcp*

ubuntu/linux-oracle*

ubuntu/linux-raspi*

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ubuntu/linux-riscv*

ubuntu/linux-nvidia<7.0.0-1006.6

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ubuntu/linux-vmware*

debian/linux<6.1.170-1

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debian/linux<6.12.85-1

6.12.85-1

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6.19.12-1

debian/linux

6.1.176-16.1.190-16.12.107-16.12.116-17.2.15-17.3.4-1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

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Fixed in 5.10.253
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Fixed in 5.15.203
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Fixed in 6.1.168
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Fixed in 6.6.134
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Fixed in 6.12.81
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Fixed in 6.18.22
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Fixed in 6.19.12
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Fixed in 5.15.0-1112.119~20.04.1
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Fixed in 5.15.0-1117.126~20.04.1
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Fixed in 5.15.0-1117.126~20.04.2
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Fixed in 5.15.0-1112.122~20.04.1
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Fixed in 5.15.0-186.196~20.04.1
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Fixed in 5.15.0-1106.110~20.04.1
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Fixed in 5.15.0-1107.113~20.04.1
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Fixed in 5.15.0-184.194~20.04.1
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Fixed in 5.15.0-1064.66~20.04.1
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Fixed in 5.15.0-1109.115~20.04.1
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Fixed in 5.15.0-1106.110~20.04.1
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Fixed in 5.15.0-1112.119
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Fixed in 6.8.0-1061.64~22.04.1
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Fixed in 5.15.0-1117.126
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Fixed in 6.8.0-1063.71~22.04.1
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Fixed in 5.15.0-1117.126
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Fixed in 6.8.0-1062.69~22.04.1
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Fixed in 5.15.0-1112.122
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Fixed in 6.8.0-1064.72~22.04.1
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Fixed in 5.15.0-1108.114
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Fixed in 5.15.0-1095.103
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Fixed in 6.8.0-136.136~22.04.1
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Fixed in 5.15.0-1106.110
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Fixed in 6.8.0-1061.62~22.04.1
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Fixed in 5.15.0-1107.113
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Fixed in 5.15.0-1104.109
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Fixed in 5.15.0-184.194
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Fixed in 5.15.0-1109.115
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Fixed in 5.15.0-1106.109
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Fixed in 6.8.0-136.136~22.04.3
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Fixed in 5.15.0-1075.79
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Fixed in 5.15.0-1096.98
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Fixed in 5.15.0-1104.106
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Fixed in 5.15.0-1111.120
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Fixed in 6.8.1-1056.57~22.04.2
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Fixed in 5.15.0-1112.119+fips1
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Fixed in 5.15.0-186.196+fips1
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Fixed in 5.15.0-1112.122+fips1
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Fixed in 6.8.0-136.136
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Fixed in 6.8.0-1064.72
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Fixed in 6.8.0-1059.67
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Fixed in 6.8.0-1046.50
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Fixed in 6.8.0-1061.62
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Fixed in 6.8.0-136.136.2
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Fixed in 6.8.0-1059.62
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Fixed in 6.8.0-1059.62.1
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Fixed in 6.8.0-1030.31
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Fixed in 6.8.0-1058.61
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Fixed in 6.8.0-1061.65
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Fixed in 6.8.0-1008.8
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Fixed in 6.8.0-1033.34
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Fixed in 6.8.0-1028.33
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Fixed in 6.8.0-2050.52
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Fixed in 6.8.1-1056.57
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Fixed in 6.8.0-1061.64+fips1
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Fixed in 6.8.0-1063.71+fips2
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Fixed in 6.8.0-136.136+fips2
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Fixed in 6.8.0-1064.72+fips1
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Fixed in 7.0.0-1006.6
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Fixed in 6.1.170-1
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Fixed in 6.12.85-1
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Fixed in 6.19.12-1
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Fixed in 6.1.176-1Fixed in 6.1.190-1Fixed in 6.12.107-1Fixed in 6.12.116-1Fixed in 7.2.15-1Fixed in 7.3.4-1

Event History

May 1, 2026

CVE Published

via MITRE·02:15 PM

Data Sourced

via MITRE·02:15 PM

Description

Data Sourced

via OSV·02:15 PM

DescriptionAffected Software

Data Sourced

via NVD·03:16 PM

RemedyDescriptionSeverityWeaknessAffected Software

Nov 11, 2026

Data Sourced

via OSV·09:39 AM

Severity

Parent advisories

This vulnerability appears in the following advisories.

DSA-6243

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

What is the severity of CVE-2026-31778?

CVE-2026-31778 has a moderate severity level due to the potential for stack out-of-bounds read issues that can lead to information disclosure.

How do I fix CVE-2026-31778?

To resolve CVE-2026-31778, update the ALSA snd_usb_caiaq driver to the latest version that contains the patch for this vulnerability.

What systems are affected by CVE-2026-31778?

CVE-2026-31778 affects the Linux Kernel ALSA snd_usb_caiaq driver starting from version 2.6.31-rc1.

What is the potential impact of CVE-2026-31778?

The potential impact of CVE-2026-31778 includes unauthorized access to sensitive information due to the out-of-bounds read.

Is CVE-2026-31778 a remote attack vector?

No, CVE-2026-31778 is not a remote attack vector; it requires local access to exploit the vulnerability.

CVE-2026-31778: ALSA: caiaq: fix stack out-of-bounds read in init_card

Affected Software

Remediation

Event History

Parent advisories

Peer vulnerabilities

Frequently Asked Questions

What is the severity of CVE-2026-31778?

How do I fix CVE-2026-31778?

What systems are affected by CVE-2026-31778?

What is the potential impact of CVE-2026-31778?

Is CVE-2026-31778 a remote attack vector?

Company

Resources

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