CVE-2025-40269 (GCVE-0-2025-40269)

Vulnerability from cvelistv5 – Published: 2025-12-06 21:50 – Updated: 2026-05-23 16:01
VLAI
Title
ALSA: usb-audio: Fix potential overflow of PCM transfer buffer
Summary
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].
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 02c56650f3c118d3752122996d96173d26bb13aa , < 480a1490c595a242f27493a4544b3efb21b29f6a (git)
Affected: 5ef30e443e6d3654cccecec99cf481a69a0a6d3b , < ab0b5e92fc36ee82c1bd01fe896d0f775ed5de41 (git)
Affected: 99703c921864a318e3e8aae74fde071b1ff35bea , < 282aba56713bbc58155716b55ca7222b2d9cf3c8 (git)
Affected: 2d50acd7dbd0682a56968ad9551341d7fc5b6eaf , < c4dc012b027c9eb101583011089dea14d744e314 (git)
Affected: aba41867dd66939d336fdf604e4d73b805d8039f , < e0ed5a36fb3ab9e7b9ee45cd17f09f6d5f594360 (git)
Affected: d288dc74f8cf95cb7ae0aaf245b7128627a49bf3 , < d67dde02049e632ba58d3c44a164a74b6a737154 (git)
Affected: f0bd62b64016508938df9babe47f65c2c727d25c , < 6a5da3fa80affc948923f20a4e086177f505e86e (git)
Affected: f0bd62b64016508938df9babe47f65c2c727d25c , < 217d47255a2ec8b246f2725f5db9ac3f1d4109d7 (git)
Affected: f0bd62b64016508938df9babe47f65c2c727d25c , < ef592bf2232a2daa9fffa8881881fc9957ea56e9 (git)
Affected: f0bd62b64016508938df9babe47f65c2c727d25c , < ece3b981bb6620e47fac826a2156c090b1a936a0 (git)
Affected: f0bd62b64016508938df9babe47f65c2c727d25c , < 98e9d5e33bda8db875cc1a4fe99c192658e45ab6 (git)
Affected: f0bd62b64016508938df9babe47f65c2c727d25c , < d2c04f20ccc6c0d219e6d3038bab45bc66a178ad (git)
Affected: f0bd62b64016508938df9babe47f65c2c727d25c , < 05a1fc5efdd8560f34a3af39c9cf1e1526cc3ddf (git)
Affected: 4.4.229 , < 4.4.230 (semver)
Affected: 4.9.229 , < 4.9.230 (semver)
Affected: 4.14.186 , < 4.14.188 (semver)
Affected: 4.19.130 , < 4.19.132 (semver)
Affected: 5.4.49 , < 5.4.51 (semver)
Affected: 5.7.6 , < 5.7.8 (semver)
Create a notification for this product.
Linux Linux Affected: 5.8
Unaffected: 0 , < 5.8 (semver)
Unaffected: 4.4.230 , ≤ 4.4.* (semver)
Unaffected: 4.9.230 , ≤ 4.9.* (semver)
Unaffected: 4.14.188 , ≤ 4.14.* (semver)
Unaffected: 4.19.132 , ≤ 4.19.* (semver)
Unaffected: 5.4.51 , ≤ 5.4.* (semver)
Unaffected: 5.7.8 , ≤ 5.7.* (semver)
Unaffected: 5.10.247 , ≤ 5.10.* (semver)
Unaffected: 5.15.197 , ≤ 5.15.* (semver)
Unaffected: 6.1.159 , ≤ 6.1.* (semver)
Unaffected: 6.6.117 , ≤ 6.6.* (semver)
Unaffected: 6.12.59 , ≤ 6.12.* (semver)
Unaffected: 6.17.9 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-audio: Fix potential overflow of PCM transfer buffer\n\nThe PCM stream data in USB-audio driver is transferred over USB URB\npacket buffers, and each packet size is determined dynamically.  The\npacket sizes are limited by some factors such as wMaxPacketSize USB\ndescriptor.  OTOH, in the current code, the actually used packet sizes\nare determined only by the rate and the PPS, which may be bigger than\nthe size limit above.  This results in a buffer overflow, as reported\nby syzbot.\n\nBasically when the limit is smaller than the calculated packet size,\nit implies that something is wrong, most likely a weird USB\ndescriptor.  So the best option would be just to return an error at\nthe parameter setup time before doing any further operations.\n\nThis patch introduces such a sanity check, and returns -EINVAL when\nthe packet size is greater than maxpacksize.  The comparison with\nep-\u003epacksize[1] alone should suffice since it\u0027s always equal or\ngreater than ep-\u003epacksize[0]."
        }
      ],
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        "dateUpdated": "2026-05-23T16:01:53.873Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/05a1fc5efdd8560f34a3af39c9cf1e1526cc3ddf"
        }
      ],
      "title": "ALSA: usb-audio: Fix potential overflow of PCM transfer buffer",
      "x_generator": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40269",
    "datePublished": "2025-12-06T21:50:50.229Z",
    "dateReserved": "2025-04-16T07:20:57.183Z",
    "dateUpdated": "2026-05-23T16:01:53.873Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
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      "cve": "CVE-2025-40269",
      "date": "2026-06-08",
      "epss": "0.00208",
      "percentile": "0.43152"
    },
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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.