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CVE-2026-98265

ALSA: usb-audio: Clamp implicit feedback packet count to URB capacity

Products / packages Linux

Published

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Severity and exploitation

Not in CISA KEVNo CVSS score

KEV coverage does not rule out exploitation.

KEV checked 14/11/2026, 21:00:34 UTC

Severity

unknown

CVSS measures technical severity, not the likelihood of an attack.

Known exploitation

Not listed in the checked CISA KEV catalog

Absence from CISA KEV does not rule out attacks.

Public exploit

Not established by this record

Missing evidence does not mean no public exploit exists.

Remediation

Fix status not established

No structured fix or guidance is available here. Check the latest publisher advisory.

What this means

In the Linux kernel, the following vulnerability has been resolved:

Source excerpt · Linux

Attack conditions

No attack-condition excerpt has been identified here. Review the full source description and references for authentication, network access, and configuration requirements.

Review supporting sources →

Affected versions

Check the exact model, release, and any platform requirements against your installation.

Linux · Linux

Linux

14 ranges
Linux version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

df75696e70c88b22ed1d8c9d515993a858c58fd0 → before 6c5c986f761756a6ff7b3aea51c11994fc2464e5

git versions

3a74f6b46c01d9a816378cd83c327a59f61475ec → before e44cee1bf51e606f3e70a213eb5a1abb3fa56a81

git versions

c26bde6301f20d9aafbfb7c2459a88c6a6ec178f → before 8b637ab10e40e01b452f4aff66dad335a9b89a16

git versions

32a1f64f8ff6e2c5391f5964baec697bce25b83c → before ad279ba0dc1781229f5b52f58d38d56960400e06

git versions

e949fd266cfa1dcca7caa3faa698578c4ffd26d6 → before 79c55a7b5d71cf2a6bbd4bd7698e1b10b70f813a

git versions

cf044e44190234a41a788de1cdbb6c21f4a52e1e → before ab77e3f453c5f2499c08d6e8e218501d25bab39e

git versions

cf044e44190234a41a788de1cdbb6c21f4a52e1e → before 76a986c980bb502c7688d605ac7a67fd257a9a1b

git versions

f6fbdf797e016fbf968dd54301026b182175985a

git versions

5.15.202 → before 5.15.224

semver versions

6.1.165 → before 6.1.191

semver versions

6.6.128 → before 6.6.160

semver versions

6.12.75 → before 6.12.112

semver versions

6.18.16 → before 6.18.54

semver versions

6.19.6 → before 6.20

semver versions

unaffected

unknown

Other versions: unaffected

Linux · Linux

Linux

9 ranges
Linux version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

7.0

unaffected

0 → before 7.0

semver versions

5.15.224 → through 5.15.*

semver versions

6.1.191 → through 6.1.*

semver versions

6.6.160 → through 6.6.*

semver versions

6.12.112 → through 6.12.*

semver versions

6.18.54 → through 6.18.*

semver versions

7.2.8 → through 7.2.*

semver versions

7.3 → through *

original_commit_for_fix versions

unknown

Other versions: affected

Automatic dependency matching is unavailable for this record. Use the product evidence and publisher’s instructions to check your installation.

What to do

Compare your installed product and version with the affected versions above. A matching product name alone does not confirm exposure.

No structured fix or remediation guidance is available here. Check the full source description and vendor’s latest advisory for a patch or workaround; do not assume another version is safe.

cve.new guidance unless attributed to a publisher. This page does not inspect your installation.

Public exploit evidence

No public exploit reference is identified in the imported evidence. This is not a claim that no exploit exists.

Original source description

Read the full publisher description

In the Linux kernel, the following vulnerability has been resolved:

ALSA: usb-audio: Clamp implicit feedback packet count to URB capacity

data_ep_set_params() allocates each data URB for exactly u->packets isochronous frames, so urb->iso_frame_desc[] has u->packets slots and ctx->packets is the driver's only record of that limit. For an implicit feedback sink, snd_usb_queue_pending_output_urbs() overwrites it with the sync source's packet count, which is calculated independently from the capture endpoint's parameters. When that count is larger, prepare_playback_urb() and prepare_silent_urb() can write iso_frame_desc[] past the allocation; their existing bounds limit payload bytes, not the descriptor index.

The reproducer uses a high-speed UAC2 device declaring bInterval 1 for implicit feedback capture (8 packets) and bInterval 4 for playback (1 packet). On the first capture completion after the stream starts, it accesses seven descriptors spanning 112 bytes beyond the one-packet URB:

BUG: KASAN: slab-out-of-bounds in prepare_playback_urb (sound/usb/pcm.c:1560) Write of size 4 at addr ffff88801e696ad0 by task vhci_rx/178 prepare_playback_urb (sound/usb/pcm.c:1560) prepare_outbound_urb (sound/usb/endpoint.c:340) snd_usb_queue_pending_output_urbs (sound/usb/endpoint.c:501) snd_complete_urb (sound/usb/endpoint.c:1834) __usb_hcd_giveback_urb (drivers/usb/core/hcd.c:1657) usb_hcd_giveback_urb (drivers/usb/core/hcd.c:1741) vhci_rx_loop (drivers/usb/usbip/vhci_rx.c:107) kthread (kernel/kthread.c:436) The buggy address belongs to the object at ffff88801e696a00 which belongs to the cache kmalloc-256 of size 256 The buggy address is located 0 bytes to the right of allocated 208-byte region [ffff88801e696a00, ffff88801e696ad0)

Record the allocated packet count per endpoint and clamp both the adopted count and the packet-size copy to it. Fold the Format Type II delimiter into urb_packs before the allocation loop so the recorded limit matches every URB.

References

7 sources
git.kernel.org/stable/c/6c5c986f761756a6ff7b3aea51c11994fc2464e5
Source referenceLinux
git.kernel.org/stable/c/e44cee1bf51e606f3e70a213eb5a1abb3fa56a81
Source referenceLinux
git.kernel.org/stable/c/8b637ab10e40e01b452f4aff66dad335a9b89a16
Source referenceLinux
git.kernel.org/stable/c/ad279ba0dc1781229f5b52f58d38d56960400e06
Source referenceLinux
git.kernel.org/stable/c/79c55a7b5d71cf2a6bbd4bd7698e1b10b70f813a
Source referenceLinux
git.kernel.org/stable/c/ab77e3f453c5f2499c08d6e8e218501d25bab39e
Source referenceLinux
View 1 more references
git.kernel.org/stable/c/76a986c980bb502c7688d605ac7a67fd257a9a1b
Source referenceLinux

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance · not supplied
Weakness classification · not supplied
Additional publishers · not supplied

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-98265

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Environment requirements

These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.

Linux · platform conditions

Any condition may hold

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 5.15.202

Before: 5.15.224

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 6.1.165

Before: 6.1.191

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 6.6.128

Before: 6.6.160

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 6.12.75

Before: 6.12.112

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 6.18.16

Before: 6.18.54

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 7.0

Before: 7.2.8

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 7.0

Before: 7.3

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 6.19.6

Applicability preview
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Contributing organizations · 1
Linux

Assigning organization

2026-10-30

Timeline

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  1. Advisory published

    Publication date supplied by the source.

  2. Source updated

    Latest modification date supplied by the source.

  3. Last imported by cve.new

    Latest catalog import, not the date we first saw this advisory.

What changed

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