VulnerabilityPublished 27 May 2026Updated 6 Nov 2026

CVE-2026-46049: Linux kernel · ALSA: ctxfi: Add fallback to default RSR for S/PDIF

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in dfc00979ff00d9dfdfa1df32144a272ee2728102 : update Linux kernel when convenient.

Data as of 6 Nov 2026, 16:34 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

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 dfc00979ff00d9dfdfa1df32144a272ee2728102, d0b53842211f73a10ea174100a213f7fa14b9f33, 09496158f6ebba8830593f8972035c02f97124c1 +5

Exploitation evidence

Disclosed: evidence found.
CVE published 27 May 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.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 8cc72361481f00253f1e468ade5795427386d593, < dfc00979ff00d9dfdfa1df32144a272ee2728102	Fixed in dfc00979ff00d9dfdfa1df32144a272ee2728102
LinuxLinux	Affected ≥ 8cc72361481f00253f1e468ade5795427386d593, < d0b53842211f73a10ea174100a213f7fa14b9f33	Fixed in d0b53842211f73a10ea174100a213f7fa14b9f33
LinuxLinux	Affected ≥ 8cc72361481f00253f1e468ade5795427386d593, < 09496158f6ebba8830593f8972035c02f97124c1	Fixed in 09496158f6ebba8830593f8972035c02f97124c1
LinuxLinux	Affected ≥ 8cc72361481f00253f1e468ade5795427386d593, < 615b7a5e5d8be68d52f262579906f7e015ba4606	Fixed in 615b7a5e5d8be68d52f262579906f7e015ba4606
LinuxLinux	Affected ≥ 8cc72361481f00253f1e468ade5795427386d593, < 95b1ee8442cabbde83b2848e7c6100df90f3a00d	Fixed in 95b1ee8442cabbde83b2848e7c6100df90f3a00d
LinuxLinux	Affected ≥ 8cc72361481f00253f1e468ade5795427386d593, < 30f9494c6f2b53a78822cfb653ffbb1d092d44c8	Fixed in 30f9494c6f2b53a78822cfb653ffbb1d092d44c8

Description

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.

References

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