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NVD / CVE Program· CNA Linux

CVE-2025-40269: ALSA: usb-audio: Fix potential overflow of PCM transfer buffer

Noroxi assessment

Priority: Monitor (action score 31/100)

  • 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: 0.19% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 05a1fc5efdd8560f34a3af39c9cf1e1526cc3ddf, 217d47255a2ec8b246f2725f5db9ac3f1d4109d7, 282aba56713bbc58155716b55ca7222b2d9cf3c8; azl3 kernel 6.6.112.1-2 on Azure Linux 3.0 6.6.117.1-1.

Low priority for now. Upgrade to Linux Linux 05a1fc5efdd8560f34a3af39c9cf1e1526cc3ddf, 217d47255a2ec8b246f2725f5db9ac3f1d4109d7, 282aba56713bbc58155716b55ca7222b2d9cf3c8; azl3 kernel 6.6.112.1-2 on Azure Linux 3.0 6.6.117.1-1 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: usb-audio: Fix potential overflow of PCM transfer buffer The PCM stream data in USB-audio driver is transferred over USB URB packet buffers, and each packet size is determined dynamically. The packet sizes are limited by some factors such as wMaxPacketSize USB descriptor. OTOH, in the current code, the actually used packet sizes are determined only by the rate and the PPS, which may be bigger than the size limit above. This results in a buffer overflow, as reported by syzbot. Basically when the limit is smaller than the calculated packet size, it implies that something is wrong, most likely a weird USB descriptor. So the best option would be just to return an error at the parameter setup time before doing any further operations. This patch introduces such a sanity check, and returns -EINVAL when the packet size is greater than maxpacksize. The comparison with ep->packsize[1] alone should suffice since it's always equal or greater than ep->packsize[0].

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Dec 6, 2025
Updated
Oct 15, 2026
EPSS
0.1% · 8th percentile
CWE
—

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
7.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • 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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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

    • 5.8affected
    • 02c56650f3c118d3752122996d96173d26bb13aa and later · before 480a1490c595a242f27493a4544b3efb21b29f6aaffected · git
    • 5ef30e443e6d3654cccecec99cf481a69a0a6d3b and later · before ab0b5e92fc36ee82c1bd01fe896d0f775ed5de41affected · git
    • 99703c921864a318e3e8aae74fde071b1ff35bea and later · before 282aba56713bbc58155716b55ca7222b2d9cf3c8affected · git
    • 2d50acd7dbd0682a56968ad9551341d7fc5b6eaf and later · before c4dc012b027c9eb101583011089dea14d744e314affected · git
    • aba41867dd66939d336fdf604e4d73b805d8039f and later · before e0ed5a36fb3ab9e7b9ee45cd17f09f6d5f594360affected · git
    • d288dc74f8cf95cb7ae0aaf245b7128627a49bf3 and later · before d67dde02049e632ba58d3c44a164a74b6a737154affected · git
    • f0bd62b64016508938df9babe47f65c2c727d25c and later · before 6a5da3fa80affc948923f20a4e086177f505e86eaffected · git
    • f0bd62b64016508938df9babe47f65c2c727d25c and later · before 217d47255a2ec8b246f2725f5db9ac3f1d4109d7affected · git
    • f0bd62b64016508938df9babe47f65c2c727d25c and later · before ef592bf2232a2daa9fffa8881881fc9957ea56e9affected · git

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:10kernel-abi-stablelistsbefore 6.12.0-124.38.1.el10_16.12.0-124.38.1.el10_1
AlmaLinux:10kernel-docbefore 6.12.0-124.38.1.el10_16.12.0-124.38.1.el10_1
AlmaLinux:8bpftoolbefore 4.18.0-553.104.1.el8_104.18.0-553.104.1.el8_10
AlmaLinux:8kernelbefore 4.18.0-553.104.1.el8_104.18.0-553.104.1.el8_10
AlmaLinux:8kernel-abi-stablelistsbefore 4.18.0-553.104.1.el8_104.18.0-553.104.1.el8_10
AlmaLinux:8kernel-corebefore 4.18.0-553.104.1.el8_104.18.0-553.104.1.el8_10
AlmaLinux:8kernel-cross-headersbefore 4.18.0-553.104.1.el8_104.18.0-553.104.1.el8_10
AlmaLinux:8kernel-debugbefore 4.18.0-553.104.1.el8_104.18.0-553.104.1.el8_10
AlmaLinux:8kernel-debug-corebefore 4.18.0-553.104.1.el8_104.18.0-553.104.1.el8_10
AlmaLinux:8kernel-debug-develbefore 4.18.0-553.104.1.el8_104.18.0-553.104.1.el8_10
AlmaLinux:8kernel-debug-modulesbefore 4.18.0-553.104.1.el8_104.18.0-553.104.1.el8_10
AlmaLinux:8kernel-debug-modules-extrabefore 4.18.0-553.104.1.el8_104.18.0-553.104.1.el8_10
AlmaLinux:8kernel-develbefore 4.18.0-553.104.1.el8_104.18.0-553.104.1.el8_10
AlmaLinux:8kernel-docbefore 4.18.0-553.104.1.el8_104.18.0-553.104.1.el8_10
AlmaLinux:8kernel-headersbefore 4.18.0-553.104.1.el8_104.18.0-553.104.1.el8_10
AlmaLinux:8kernel-modulesbefore 4.18.0-553.104.1.el8_104.18.0-553.104.1.el8_10
AlmaLinux:8kernel-modules-extrabefore 4.18.0-553.104.1.el8_104.18.0-553.104.1.el8_10
AlmaLinux:8kernel-rtbefore 4.18.0-553.104.1.rt7.445.el8_104.18.0-553.104.1.rt7.445.el8_10
AlmaLinux:8kernel-rt-corebefore 4.18.0-553.104.1.rt7.445.el8_104.18.0-553.104.1.rt7.445.el8_10
AlmaLinux:8kernel-rt-debugbefore 4.18.0-553.104.1.rt7.445.el8_104.18.0-553.104.1.rt7.445.el8_10
AlmaLinux:8kernel-rt-debug-corebefore 4.18.0-553.104.1.rt7.445.el8_104.18.0-553.104.1.rt7.445.el8_10
AlmaLinux:8kernel-rt-debug-develbefore 4.18.0-553.104.1.rt7.445.el8_104.18.0-553.104.1.rt7.445.el8_10
AlmaLinux:8kernel-rt-debug-modulesbefore 4.18.0-553.104.1.rt7.445.el8_104.18.0-553.104.1.rt7.445.el8_10
AlmaLinux:8kernel-rt-debug-modules-extrabefore 4.18.0-553.104.1.rt7.445.el8_104.18.0-553.104.1.rt7.445.el8_10

+96

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-2025-40267Dec 6, 2025 · io_uring/rw: ensure allocated iovec gets cleared for early failure
    0Monitor
  • ← EarlierCVE-2025-40268Dec 6, 2025 · cifs: client: fix memory leak in smb3_fs_context_parse_param
    0Monitor
  • Later →CVE-2025-40270Dec 6, 2025 · mm, swap: fix potential UAF issue for VMA readahead
    31Monitor

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 Linux05a1fc5efdd8560f34a3af39c9cf1e1526cc3ddfVendor (CNA)
Linux Linux217d47255a2ec8b246f2725f5db9ac3f1d4109d7Vendor (CNA)
Linux Linux282aba56713bbc58155716b55ca7222b2d9cf3c8Vendor (CNA)
Linux Linux4.14.188Vendor (CNA)
Linux Linux4.19.132Vendor (CNA)
Linux Linux4.4.230Vendor (CNA)
Linux Linux4.9.230Vendor (CNA)
Linux Linux480a1490c595a242f27493a4544b3efb21b29f6aVendor (CNA)
Linux Linux5.4.51Vendor (CNA)
Linux Linux5.7.8Vendor (CNA)
Linux Linux6a5da3fa80affc948923f20a4e086177f505e86eVendor (CNA)
Linux Linux98e9d5e33bda8db875cc1a4fe99c192658e45ab6Vendor (CNA)
Linux Linuxab0b5e92fc36ee82c1bd01fe896d0f775ed5de41Vendor (CNA)
Linux Linuxc4dc012b027c9eb101583011089dea14d744e314Vendor (CNA)
Linux Linuxd2c04f20ccc6c0d219e6d3038bab45bc66a178adVendor (CNA)
Linux Linuxd67dde02049e632ba58d3c44a164a74b6a737154Vendor (CNA)
Linux Linuxe0ed5a36fb3ab9e7b9ee45cd17f09f6d5f594360Vendor (CNA)
Linux Linuxece3b981bb6620e47fac826a2156c090b1a936a0Vendor (CNA)
Linux Linuxef592bf2232a2daa9fffa8881881fc9957ea56e9Vendor (CNA)
azl3 kernel 6.6.112.1-2 on Azure Linux 3.06.6.117.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:kernel5.14.0-611.30.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k5.14.0-611.30.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-core5.14.0-611.30.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug5.14.0-611.30.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-core5.14.0-611.30.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel5.14.0-611.30.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched5.14.0-611.30.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules5.14.0-611.30.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-core5.14.0-611.30.1.el9_7 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra5.14.0-611.30.1.el9_7 · AlmaLinux:9Package registry (OSV)

+16

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.

No history yet (it accumulates with the daily EPSS job).

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

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-secondary

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✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (12 more)

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

All records