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CVE.org (no NVD analysis yet)· CNA Linux

CVE-2026-98314: ALSA: pcm: set timer->private_data before registering the PCM timer

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.18% (FIRST EPSS).
  • Fixed version: Linux Linux 0b349249d572633d7c8cdeb917623d1676a2b7c3, 1e713f9bb2ac583521f06b0eb4e22440b1e3d078, 27f167e117eca310661fbcbacb352ea08face067; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1.

Low priority for now. Upgrade to Linux Linux 0b349249d572633d7c8cdeb917623d1676a2b7c3, 1e713f9bb2ac583521f06b0eb4e22440b1e3d078, 27f167e117eca310661fbcbacb352ea08face067; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: ALSA: pcm: set timer->private_data before registering the PCM timer snd_pcm_timer_init() calls snd_device_register() to link the new struct snd_timer into the global timer list while it still carries hw.c_resolution = snd_pcm_timer_resolution (and hw.start/hw.stop), and only afterwards sets timer->private_data = substream. Once the timer is on the list under register_mutex, a concurrent reader can already reach it through the same mutex and invoke these callbacks. /proc/asound/timers does this via c_resolution(), and snd_timer_open()+snd_timer_start() reach start()/stop() the same way. All three dereference timer->private_data, which for this brief window is NULL, giving a NULL-pointer dereference: substream = timer->private_data; return substream->runtime ? ... // substream is NULL Move the private_data/private_free assignment before snd_device_register() so the timer is never visible on the list without its private_data set. On the snd_device_register() failure path, private_free() (snd_pcm_timer_free()) can now run, but it only does substream->timer = NULL, which is already NULL at that point since substream->timer is set to the new timer just once, after a successful registration -- so the failure path stays safe.

—No exploit Fix available
Published
Oct 6, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 8th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 2.6.12affected
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 27f167e117eca310661fbcbacb352ea08face067affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 555d168bd98daa46daccc68c908201388c834293affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 8c869d5cf5affb20994bdbb60e7d46d65c91b55faffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 686c7a6af1eea8d2a919303e4c6bbec3de79dbdcaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before e1eee8f16628f8b6bcae0a366fd6a2dd65e71eddaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before d63f5a9f8121fb43c798056d7dd34c58f47185d7affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 0b349249d572633d7c8cdeb917623d1676a2b7c3affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 1e713f9bb2ac583521f06b0eb4e22440b1e3d078affected · git
    • before 2.6.12not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.113-1~deb12u16.12.113-1~deb12u1
Debian:13linuxbefore 6.12.113-16.12.113-1
Debian:14linuxbefore 7.2.8-17.2.8-1

Same product

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Published before and after this one in the same product

  • ← EarlierCVE-2026-98312Oct 6, 2026 · ALSA: 6fire: fix OOB write from device-reported iso length
    0Monitor
  • ← EarlierCVE-2026-98313Oct 6, 2026 · drm/msm/dp: skip PUSH_IDLE when the link was never enabled
    0Monitor
  • Later →CVE-2026-98315Oct 6, 2026 · ntfs: protect runlist updates with the runlist lock
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux0b349249d572633d7c8cdeb917623d1676a2b7c3Vendor (CNA)
Linux Linux1e713f9bb2ac583521f06b0eb4e22440b1e3d078Vendor (CNA)
Linux Linux27f167e117eca310661fbcbacb352ea08face067Vendor (CNA)
Linux Linux555d168bd98daa46daccc68c908201388c834293Vendor (CNA)
Linux Linux686c7a6af1eea8d2a919303e4c6bbec3de79dbdcVendor (CNA)
Linux Linux8c869d5cf5affb20994bdbb60e7d46d65c91b55fVendor (CNA)
Linux Linuxd63f5a9f8121fb43c798056d7dd34c58f47185d7Vendor (CNA)
Linux Linuxe1eee8f16628f8b6bcae0a366fd6a2dd65e71eddVendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.06.6.158.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.113-1 · Debian:13Package registry (OSV)
debian:linux7.2.8-1 · Debian:14Package registry (OSV)
debian:linux-6.126.12.113-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 6, 2026+32 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Exploit maturity— → none
  2. Fix✗ → ✓

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References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

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