ALSA: firewire: isight: bound the sample count to the packet payload
Published Jul 25, 2026
6.3
MEDIUMCVSS 3.1
EPSS 0.22%
Description
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.
Affected products
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- Version StatusaffectedConstraints
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- Version
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- Version 3.0StatusaffectedConstraints-
- Version 0StatusunaffectedConstraints<3.0
- Version 5.10.261StatusunaffectedConstraints<=5.10.*
- Version 5.15.212StatusunaffectedConstraints<=5.15.*
- Version 6.1.178StatusunaffectedConstraints<=6.1.*
- Version 6.12.96StatusunaffectedConstraints<=6.12.*
- Version 6.18.39StatusunaffectedConstraints<=6.18.*
- Version 6.6.145StatusunaffectedConstraints<=6.6.*
- Version 7.1.4StatusunaffectedConstraints<=7.1.*
- Version 7.2StatusunaffectedConstraints<=*
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Linux | Linux | unaffected |
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| Linux | Linux | affected |
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No data.
No data.
Red Hat Enterprise Linux 10
kernel
Not affected
Red Hat Enterprise Linux 6
kernel
Not affected
Red Hat Enterprise Linux 7
kernel
Fix deferred
Red Hat Enterprise Linux 7
kernel-rt
Fix deferred
Red Hat Enterprise Linux 8
kernel
Fix deferred
Red Hat Enterprise Linux 8
kernel-rt
Fix deferred
Red Hat Enterprise Linux 9
kernel
Not affected
Red Hat Enterprise Linux 9
kernel-rt
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 10 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 6 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel | Fix deferred | n/a |
| Red Hat Enterprise Linux 7 | kernel-rt | Fix deferred | n/a |
| Red Hat Enterprise Linux 8 | kernel | Fix deferred | n/a |
| Red Hat Enterprise Linux 8 | kernel-rt | Fix deferred | n/a |
| Red Hat Enterprise Linux 9 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 9 | kernel-rt | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:P/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
Jul–Oct 2026- EPSS v5
Percentile over time
- EPSS v5
Table of values (2 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.22% (0.00220) | 11.24th | v5 (v2026.06.15) |
| Jul 25, 2026 | 0.22% (0.00220) | 12.59th | v5 (v2026.06.15) |
References (13)
- https://access.redhat.com/security/cve/CVE-2026-64483 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2507125 Issue Tracking
- https://git.kernel.org/stable/c/24423e0a9251d348c3f1fb0bb0e61b879e1e976c
- https://git.kernel.org/stable/c/29b9667982e4df2ed7744f86b1144f8bb58eb698
- https://git.kernel.org/stable/c/31a01b70bb90e3ef3147f308e2ea899e1d2485ca
- https://git.kernel.org/stable/c/31da82b9676c6b112e7c72c7529e6812b919742a
- https://git.kernel.org/stable/c/3ed2fa1ed8cc65f910b8bbc0be3cc366b30f8478
- https://git.kernel.org/stable/c/57e4d9043afc1eaddee8f50d11def6e65415d273
- https://git.kernel.org/stable/c/8e48a29813df8dd71503800b7acf69c12c035045
- https://git.kernel.org/stable/c/ebbffacda6733dcbcef601b5b523460f8d8b671e
- https://lore.kernel.org/linux-cve-announce/2026072548-CVE-2026-64483-005d@gregkh/T
- https://nvd.nist.gov/vuln/detail/CVE-2026-64483
- https://www.cve.org/CVERecord?id=CVE-2026-64483
Change history (0)
No recorded changes yet.