CVE-2025-40269ALSA: usb-audio: Fix potential overflow of PCM transfer buffer
- 7.8HighCVSS base score
- 0.19%Exploitation in 30 daysEPSS · top 91% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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].
Timeline
ID reserved
By Linux
- 8 months later
· 8 months later
Published
- 8 months later
· 8 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Deferred | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.19% · top 91% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 02c56650f3c118d3752122996d96173d26bb13aa – < 480a1490c595a242f27493a4544b3efb21b29f6a
- affected 5ef30e443e6d3654cccecec99cf481a69a0a6d3b – < ab0b5e92fc36ee82c1bd01fe896d0f775ed5de41
- affected 99703c921864a318e3e8aae74fde071b1ff35bea – < 282aba56713bbc58155716b55ca7222b2d9cf3c8
- affected 2d50acd7dbd0682a56968ad9551341d7fc5b6eaf – < c4dc012b027c9eb101583011089dea14d744e314
- affected aba41867dd66939d336fdf604e4d73b805d8039f – < e0ed5a36fb3ab9e7b9ee45cd17f09f6d5f594360
- affected d288dc74f8cf95cb7ae0aaf245b7128627a49bf3 – < d67dde02049e632ba58d3c44a164a74b6a737154
- affected f0bd62b64016508938df9babe47f65c2c727d25c – < 6a5da3fa80affc948923f20a4e086177f505e86e
- affected f0bd62b64016508938df9babe47f65c2c727d25c – < 217d47255a2ec8b246f2725f5db9ac3f1d4109d7
- affected f0bd62b64016508938df9babe47f65c2c727d25c – < ef592bf2232a2daa9fffa8881881fc9957ea56e9
- affected f0bd62b64016508938df9babe47f65c2c727d25c – < ece3b981bb6620e47fac826a2156c090b1a936a0
- affected f0bd62b64016508938df9babe47f65c2c727d25c – < 98e9d5e33bda8db875cc1a4fe99c192658e45ab6
- affected f0bd62b64016508938df9babe47f65c2c727d25c – < d2c04f20ccc6c0d219e6d3038bab45bc66a178ad
- affected f0bd62b64016508938df9babe47f65c2c727d25c – < 05a1fc5efdd8560f34a3af39c9cf1e1526cc3ddf
- affected 4.4.229 – < 4.4.230
- affected 4.9.229 – < 4.9.230
- affected 4.14.186 – < 4.14.188
- affected 4.19.130 – < 4.19.132
- affected 5.4.49 – < 5.4.51
- affected 5.7.6 – < 5.7.8
- affected 5.8
- unaffected < 5.8
- unaffected 4.4.230 – ≤ 4.4.*
- unaffected 4.9.230 – ≤ 4.9.*
- unaffected 4.14.188 – ≤ 4.14.*
- unaffected 4.19.132 – ≤ 4.19.*
- unaffected 5.4.51 – ≤ 5.4.*
- unaffected 5.7.8 – ≤ 5.7.*
- unaffected 5.10.247 – ≤ 5.10.*
- unaffected 5.15.197 – ≤ 5.15.*
- unaffected 6.1.159 – ≤ 6.1.*
- unaffected 6.6.117 – ≤ 6.6.*
- unaffected 6.12.59 – ≤ 6.12.*
- unaffected 6.17.9 – ≤ 6.17.*
- unaffected 6.18 – ≤ *
References
References13
- https://git.kernel.org/stable/c/480a1490c595a242f27493a4544b3efb21b29f6a (opens in a new tab)
- https://git.kernel.org/stable/c/ab0b5e92fc36ee82c1bd01fe896d0f775ed5de41 (opens in a new tab)
- https://git.kernel.org/stable/c/282aba56713bbc58155716b55ca7222b2d9cf3c8 (opens in a new tab)
- https://git.kernel.org/stable/c/c4dc012b027c9eb101583011089dea14d744e314 (opens in a new tab)
- https://git.kernel.org/stable/c/e0ed5a36fb3ab9e7b9ee45cd17f09f6d5f594360 (opens in a new tab)
- https://git.kernel.org/stable/c/d67dde02049e632ba58d3c44a164a74b6a737154 (opens in a new tab)
- https://git.kernel.org/stable/c/6a5da3fa80affc948923f20a4e086177f505e86e (opens in a new tab)
- https://git.kernel.org/stable/c/217d47255a2ec8b246f2725f5db9ac3f1d4109d7 (opens in a new tab)
- https://git.kernel.org/stable/c/ef592bf2232a2daa9fffa8881881fc9957ea56e9 (opens in a new tab)
- https://git.kernel.org/stable/c/ece3b981bb6620e47fac826a2156c090b1a936a0 (opens in a new tab)
- https://git.kernel.org/stable/c/98e9d5e33bda8db875cc1a4fe99c192658e45ab6 (opens in a new tab)
- https://git.kernel.org/stable/c/d2c04f20ccc6c0d219e6d3038bab45bc66a178ad (opens in a new tab)
- https://git.kernel.org/stable/c/05a1fc5efdd8560f34a3af39c9cf1e1526cc3ddf (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2025-201586 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2025-40269)Record last updated .