FKIE_CVE-2025-21646

Vulnerability from fkie_nvd - Published: 2025-01-19 11:15 - Updated: 2025-11-03 21:19
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: afs: Fix the maximum cell name length The kafs filesystem limits the maximum length of a cell to 256 bytes, but a problem occurs if someone actually does that: kafs tries to create a directory under /proc/net/afs/ with the name of the cell, but that fails with a warning: WARNING: CPU: 0 PID: 9 at fs/proc/generic.c:405 because procfs limits the maximum filename length to 255. However, the DNS limits the maximum lookup length and, by extension, the maximum cell name, to 255 less two (length count and trailing NUL). Fix this by limiting the maximum acceptable cellname length to 253. This also allows us to be sure we can create the "/afs/.<cell>/" mountpoint too. Further, split the YFS VL record cell name maximum to be the 256 allowed by the protocol and ignore the record retrieved by YFSVL.GetCellName if it exceeds 253.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7673030efe0f8ca1056d3849d61784c6caa052afPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7922b1f058fe24a93730511dd0ae2e1630920096Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7cb3e77e9b4e6ffa325a5559393d3283c9af3d01Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8fd56ad6e7c90ac2bddb0741c6b248c8c5d56ac8Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9340385468d056bb700b8f28df236b81fc86a079Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/aabe47cf5ac5e1db2ae0635f189d836f67024904Patch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 6.13
linux linux_kernel 6.13
linux linux_kernel 6.13
linux linux_kernel 6.13
linux linux_kernel 6.13
linux linux_kernel 6.13
To clipboard 

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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nafs: Fix the maximum cell name length\n\nThe kafs filesystem limits the maximum length of a cell to 256 bytes, but a\nproblem occurs if someone actually does that: kafs tries to create a\ndirectory under /proc/net/afs/ with the name of the cell, but that fails\nwith a warning:\n\n        WARNING: CPU: 0 PID: 9 at fs/proc/generic.c:405\n\nbecause procfs limits the maximum filename length to 255.\n\nHowever, the DNS limits the maximum lookup length and, by extension, the\nmaximum cell name, to 255 less two (length count and trailing NUL).\n\nFix this by limiting the maximum acceptable cellname length to 253.  This\nalso allows us to be sure we can create the \"/afs/.\u003ccell\u003e/\" mountpoint too.\n\nFurther, split the YFS VL record cell name maximum to be the 256 allowed by\nthe protocol and ignore the record retrieved by YFSVL.GetCellName if it\nexceeds 253."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: afs: Arreglar la longitud m\u00e1xima del nombre de celda El sistema de archivos kafs limita la longitud m\u00e1xima de una celda a 256 bytes, pero ocurre un problema si alguien realmente hace eso: kafs intenta crear un directorio bajo /proc/net/afs/ con el nombre de la celda, pero eso falla con una advertencia: ADVERTENCIA: CPU: 0 PID: 9 en fs/proc/generic.c:405 porque procfs limita la longitud m\u00e1xima del nombre de archivo a 255. Sin embargo, el DNS limita la longitud m\u00e1xima de b\u00fasqueda y, por extensi\u00f3n, el nombre m\u00e1ximo de celda, a 255 menos dos (recuento de longitud y NUL final). Arregle esto limitando la longitud m\u00e1xima aceptable del nombre de celda a 253. Esto tambi\u00e9n nos permite estar seguros de que podemos crear el punto de montaje \"/afs/./\" tambi\u00e9n. Adem\u00e1s, divida el nombre de celda del registro YFS VL al m\u00e1ximo de 256 permitido por el protocolo e ignore el registro recuperado por YFSVL.GetCellName si excede 253."
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  "id": "CVE-2025-21646",
  "lastModified": "2025-11-03T21:19:00.550",
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          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
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  "published": "2025-01-19T11:15:10.197",
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  "vulnStatus": "Modified",
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