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NVD / CVE Program· CNA Linux

CVE-2026-90220: ALSA: seq: Don't leak the extension cell pointer in the bounce payload

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: 0.20% (FIRST EPSS).
  • Fixed version: Linux Linux 42c3f856d13a91a0d4c302a0c6854813621136db, 59e1592d3c270ff4642d5d6dc55c545306eb0693, 6.12.110.

Low priority for now. Upgrade to Linux Linux 42c3f856d13a91a0d4c302a0c6854813621136db, 59e1592d3c270ff4642d5d6dc55c545306eb0693, 6.12.110 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: Don't leak the extension cell pointer in the bounce payload The bounce_error_event() embeds the failed event in the bounce payload by pointing data.ext.ptr at it. When that event is a queued variable-length event, its own data.ext.ptr holds the address of its first extension cell, put there by snd_seq_event_dup(). The payload goes out verbatim through snd_seq_expand_var_event(), so the address reaches userspace. That is the same address commit 705dd6dcbc0e ("ALSA: seq: Clear variable event pointer on read") removed from the event header. The read path still clears it there, just above the call that expands the payload. Embed a sanitised copy instead, treated exactly as snd_seq_read() treats the header. A stack copy is enough because delivery is synchronous and snd_seq_event_dup() copies before returning. An unprivileged client reaches this by setting SNDRV_SEQ_FILTER_BOUNCE, queueing a variable-length event to a port that does not exist and reading the bounce back. Eight bytes on 64-bit, from its own pool.

—No exploit Fix available
Published
Sep 17, 2026
Updated
Oct 21, 2026
EPSS
0.2% · 9th 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%

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  • A fix has been released

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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

    • eae296065ede41a24040e6a7c909ec970f78b4eb, 0527a56cb327021cb73167cfddf0e49efa043500, 7.2affected
    • 93d260ce43a81df579c98bee92b91316df9c1c57 and later · before 42c3f856d13a91a0d4c302a0c6854813621136dbaffected · git
    • dae23c545eb5a2be3b27a82fd0f611894fb8ab69 and later · before b1e8d40663997aacaa198f37ce6893e07aaba77aaffected · git
    • efc86691e4d8083d9e380ea95042c2cf679f65fd and later · before 6e6e471eef1d5d8cb056c7d364023fe048249204affected · git
    • efc86691e4d8083d9e380ea95042c2cf679f65fd and later · before 59e1592d3c270ff4642d5d6dc55c545306eb0693affected · git
    • 6.12.97 and later · before 6.12.110affected · semver
    • 6.18.40 and later · before 6.18.52affected · semver
    • 6.6.160 and later · before 6.7affected · semver
    • 7.1.5 and later · before 7.2affected · semver
    • before 7.2not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.6-17.2.6-1

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-2026-90218Sep 17, 2026 · RDMA/cma: Fix WARNING in res_to_rt
    0Monitor
  • ← EarlierCVE-2026-90219Sep 17, 2026 · RDMA/cxgb4: Free debugfs on registration failure
    0Monitor
  • Later →CVE-2026-90221Sep 17, 2026 · nfc: nci: fix use of uninitialized memory in CORE_INIT_RSP parsing
    0Monitor

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 Linux42c3f856d13a91a0d4c302a0c6854813621136dbVendor (CNA)
Linux Linux59e1592d3c270ff4642d5d6dc55c545306eb0693Vendor (CNA)
Linux Linux6.12.110Vendor (CNA)
Linux Linux6.18.52Vendor (CNA)
Linux Linux6.7Vendor (CNA)
Linux Linux6e6e471eef1d5d8cb056c7d364023fe048249204Vendor (CNA)
Linux Linux7.2Vendor (CNA)
Linux Linuxb1e8d40663997aacaa198f37ce6893e07aaba77aVendor (CNA)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~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.

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.

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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 (3 more)

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

All records