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CVE-2026-64483· NVD / CVE Program· CNA Linux

ALSA: firewire: isight: bound the sample count to the packet payload

In the Linux kernel, the following vulnerability has been resolved: ALSA: firewire: isight: bound the sample count to the packet payload isight_packet() takes the frame count from the device iso packet and checks it only against the device claimed iso length. count = be32_to_cpu(payload->sample_count); if (likely(count <= (length - 16) / 4)) isight_samples(isight, payload->samples, count); length is the iso header data_length. It can be up to 0xffff. So the gate allows a count up to about 16379. isight_samples() then copies count frames out of payload->samples into the PCM DMA buffer. payload->samples holds only 2 * MAX_FRAMES_PER_PACKET values. The device multiplexes two samples per frame. A count past MAX_FRAMES_PER_PACKET reads past the payload. A count past the buffer size writes past runtime->dma_area. The smallest PCM buffer is larger than MAX_FRAMES_PER_PACKET. Bounding the count to MAX_FRAMES_PER_PACKET keeps both the read and the write in range. A malicious or faulty Apple iSight on the FireWire bus reaches this during a normal capture. Add the MAX_FRAMES_PER_PACKET bound to the gate.

—No exploit Fix available
Published
Jul 25, 2026
Updated
Aug 17, 2026
EPSS
0.2% · 11th percentile
CWE
—
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Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

Affected systems

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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

    • 3.0affected
    • 3a691b28a0ca3cf4d9010c6158318159e0275d2c and later · before 24423e0a9251d348c3f1fb0bb0e61b879e1e976caffected · git
    • 3a691b28a0ca3cf4d9010c6158318159e0275d2c and later · before ebbffacda6733dcbcef601b5b523460f8d8b671eaffected · git
    • 3a691b28a0ca3cf4d9010c6158318159e0275d2c and later · before 57e4d9043afc1eaddee8f50d11def6e65415d273affected · git
    • 3a691b28a0ca3cf4d9010c6158318159e0275d2c and later · before 3ed2fa1ed8cc65f910b8bbc0be3cc366b30f8478affected · git
    • 3a691b28a0ca3cf4d9010c6158318159e0275d2c and later · before 31da82b9676c6b112e7c72c7529e6812b919742aaffected · git
    • 3a691b28a0ca3cf4d9010c6158318159e0275d2c and later · before 8e48a29813df8dd71503800b7acf69c12c035045affected · git
    • 3a691b28a0ca3cf4d9010c6158318159e0275d2c and later · before 31a01b70bb90e3ef3147f308e2ea899e1d2485caaffected · git
    • 3a691b28a0ca3cf4d9010c6158318159e0275d2c and later · before 29b9667982e4df2ed7744f86b1144f8bb58eb698affected · git
    • before 3.0not 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:12linux-6.12before 6.12.100-1~deb12u16.12.100-1~deb12u1
Debian:13linuxbefore 6.12.96-16.12.96-1
Debian:14linuxbefore 7.1.4-17.1.4-1

Same product

linux: all records

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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 Linux24423e0a9251d348c3f1fb0bb0e61b879e1e976cVendor (CNA)
Linux Linux29b9667982e4df2ed7744f86b1144f8bb58eb698Vendor (CNA)
Linux Linux31a01b70bb90e3ef3147f308e2ea899e1d2485caVendor (CNA)
Linux Linux31da82b9676c6b112e7c72c7529e6812b919742aVendor (CNA)
Linux Linux3ed2fa1ed8cc65f910b8bbc0be3cc366b30f8478Vendor (CNA)
Linux Linux57e4d9043afc1eaddee8f50d11def6e65415d273Vendor (CNA)
Linux Linux8e48a29813df8dd71503800b7acf69c12c035045Vendor (CNA)
Linux Linuxebbffacda6733dcbcef601b5b523460f8d8b671eVendor (CNA)
debian:linux6.1.180-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.100-1~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

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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.

Noroxi analysis

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Change log

  1. Fix✗ → ✓

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References

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

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