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Linux Kernel EUVDEUVD-2026-32431

| CVE-2026-46049 MEDIUM
2026-05-27 416baaa9-dc9f-4396-8d5f-8c081fb06d67 GHSA-cvxr-f657-mx22
Linux Information Disclosure Red Hat Suse
5.5
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
5.5 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
vuln.today AI
5.5 MEDIUM

Local audio device access requires low-privilege group membership (AV:L, PR:L); only a kernel hang results, with no confidentiality or integrity impact (C:N, I:N, A:H).

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
4.0 AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
SUSE
MEDIUM
qualitative
Red Hat
5.5 LOW
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

5
Analysis Generated
Jun 16, 2026 - 15:11 vuln.today
CVSS changed
Jun 16, 2026 - 15:07 NVD
5.5 (MEDIUM)
Patch available
May 27, 2026 - 19:46 EUVD
CVE Published
May 27, 2026 - 14:17 nvd
MEDIUM 5.5
CVE Published
May 27, 2026 - 14:17 nvd
UNKNOWN (no severity yet)

DescriptionNVD

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

ALSA: ctxfi: Add fallback to default RSR for S/PDIF

spdif_passthru_playback_get_resources() uses atc->pll_rate as the RSR for the MSR calculation loop. However, pll_rate is only updated in atc_pll_init() and not in hw_pll_init(), so it remains 0 after the card init.

When spdif_passthru_playback_setup() skips atc_pll_init() for 32000 Hz, (rsr * desc.msr) always becomes 0, causing the loop to spin indefinitely.

Add fallback to use atc->rsr when atc->pll_rate is 0. This reflects the hardware state, since hw_card_init() already configures the PLL to the default RSR.

AnalysisAI

Infinite loop denial-of-service in the Linux kernel ALSA ctxfi audio driver allows a local low-privileged user to hang the kernel by triggering S/PDIF passthrough playback at 32000 Hz on Creative Sound Blaster X-Fi hardware. The root cause is an uninitialized pll_rate field that causes a resource-calculation loop to never exit, consuming CPU indefinitely and degrading or halting system availability. No public exploit exists and the EPSS score of 0.02% (5th percentile) confirms negligible real-world exploitation pressure; the vulnerability is not listed in CISA KEV.

Technical ContextAI

The vulnerability resides in the ctxfi ALSA subsystem driver (Creative Sound Blaster X-Fi) within the Linux kernel sound stack. The function spdif_passthru_playback_get_resources() uses atc->pll_rate as the RSR (Reference Sample Rate) when iterating through MSR (Master Sample Rate) descriptor combinations. The field pll_rate is only set in atc_pll_init() and not in the alternative hw_pll_init() path, leaving it at zero after normal hardware card initialization. When spdif_passthru_playback_setup() processes a 32000 Hz stream, it bypasses atc_pll_init(), so the loop condition (rsr * desc.msr) permanently evaluates to zero, creating an unreachable exit condition (effectively CWE-835, Loop with Unreachable Exit Condition). The fix adds a fallback to use atc->rsr when atc->pll_rate is zero, reflecting the actual hardware PLL state set by hw_card_init(). Affected CPE: cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* across multiple stable branches.

RemediationAI

Upgrade to a patched kernel version: Linux 6.6.140, 6.12.86, 6.18.27, 7.0.4, or 7.1-rc1 or later, per EUVD-confirmed fix data. Upstream commits are available at https://git.kernel.org/stable/c/30f9494c6f2b53a78822cfb653ffbb1d092d44c8 and the sibling stable-branch commits listed in references. If an immediate kernel upgrade is not feasible, blacklisting the ctxfi module eliminates the vulnerable code path entirely with no impact on non-Creative audio hardware: add 'blacklist snd-ctxfi' to /etc/modprobe.d/ and reboot. As a narrower compensating control, restricting audio device node access via udev rules or group membership (removing non-essential users from the 'audio' group) prevents unprivileged triggering of the 32000 Hz S/PDIF passthrough path, though this affects all audio use for those users. Distribution vendors (Debian, Ubuntu, RHEL, SUSE) are expected to backport the fix through standard security update channels.

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
openSUSE Tumbleweed Fixed
SUSE Linux Enterprise Desktop 15 SP7 Not-Affected
SUSE Linux Enterprise Desktop 15 SP7 Not-Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Not-Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Not-Affected

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EUVD-2026-32431 vulnerability details – vuln.today
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