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NVD / CVE Program· CNA Linux

CVE-2026-74339: ALSA: seq: Clear variable event pointer on read

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: 0.22% (FIRST EPSS).
  • Fixed version: Linux Linux 14fe4f75fd5309d6b75f8e840ada88912b374207, 6b52211eba213c461f68922708a99d8190c1fcd5, 705dd6dcbc0ea87351c660c1a6443f85f1001c76.

Low priority for now. Upgrade to Linux Linux 14fe4f75fd5309d6b75f8e840ada88912b374207, 6b52211eba213c461f68922708a99d8190c1fcd5, 705dd6dcbc0ea87351c660c1a6443f85f1001c76 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: seq: Clear variable event pointer on read snd_seq_read() copies a queued variable-length event header to userspace before expanding the payload. Queued variable-length events use SNDRV_SEQ_EXT_CHAINED internally, and data.ext.ptr points at the first extension cell. The read side strips SNDRV_SEQ_EXT_* bits from data.ext.len before the copy, but it leaves data.ext.ptr untouched. A userspace sequencer client can therefore write a direct variable event to itself and read back the extension-cell kernel address from the returned header. Clear the temporary header pointer before copy_to_user(). The original queued event remains unchanged and is still passed to snd_seq_expand_var_event(), so payload expansion keeps using the internal chain.

—No exploit Fix available
Published
Aug 15, 2026
Updated
Oct 30, 2026
EPSS
0.2% · 12th 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 · 0.2%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

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  • when exploit code appears or is weaponized
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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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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 8a631e1aaa1ebbc9de916927fa01707244e18291affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 14fe4f75fd5309d6b75f8e840ada88912b374207affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before f29243c211928114f8b906e0a3fee77c236f14c8affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before e0c3edd86414534cfd179fefe45b38c29c01ae7aaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 6b52211eba213c461f68922708a99d8190c1fcd5affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 74ac1ce1f4afdb3b80b6742fa28fb86c8c51d31baffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before c2ac9287e89916da684c2a548798351e63eb59eeaffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 705dd6dcbc0ea87351c660c1a6443f85f1001c76affected · 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 6.1.180-16.1.180-1
Debian:13linuxbefore 6.12.100-16.12.100-1
Debian:14linuxbefore 7.1.5-17.1.5-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-74336Aug 15, 2026 · wifi: mac80211: bound S1G TIM PVB walk to the TIM element
    0Monitor
  • ← EarlierCVE-2026-74338Aug 15, 2026 · bpf: Reject sleepable BPF_LSM_CGROUP programs at load time
    31Monitor
  • Later →CVE-2026-74340Aug 15, 2026 · wifi: wcn36xx: fix OOB read from firmware count in PRINT_REG_INFO indication
    32Monitor

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 Linux14fe4f75fd5309d6b75f8e840ada88912b374207Vendor (CNA)
Linux Linux6b52211eba213c461f68922708a99d8190c1fcd5Vendor (CNA)
Linux Linux705dd6dcbc0ea87351c660c1a6443f85f1001c76Vendor (CNA)
Linux Linux74ac1ce1f4afdb3b80b6742fa28fb86c8c51d31bVendor (CNA)
Linux Linux8a631e1aaa1ebbc9de916927fa01707244e18291Vendor (CNA)
Linux Linuxc2ac9287e89916da684c2a548798351e63eb59eeVendor (CNA)
Linux Linuxe0c3edd86414534cfd179fefe45b38c29c01ae7aVendor (CNA)
Linux Linuxf29243c211928114f8b906e0a3fee77c236f14c8Vendor (CNA)
debian:linux6.1.180-1 · 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.

No dated events beyond publication.

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. Fix✗ → ✓

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References

Show all references (7 more)

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

All records