FKIE_CVE-2024-40966

Vulnerability from fkie_nvd - Published: 2024-07-12 13:15 - Updated: 2025-11-03 22:17
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: tty: add the option to have a tty reject a new ldisc ... and use it to limit the virtual terminals to just N_TTY. They are kind of special, and in particular, the "con_write()" routine violates the "writes cannot sleep" rule that some ldiscs rely on. This avoids the BUG: sleeping function called from invalid context at kernel/printk/printk.c:2659 when N_GSM has been attached to a virtual console, and gsmld_write() calls con_write() while holding a spinlock, and con_write() then tries to get the console lock.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/287b569a5b914903ba7c438a3c0dbc3410ebb409Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3c6332f3bb1578b5b10ac2561247b1d6272ae937Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5920ac19964f9e20181f63b410d9200ddbf8dc86Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6bd23e0c2bb6c65d4f5754d1456bc9a4427fc59bPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/287b569a5b914903ba7c438a3c0dbc3410ebb409Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3c6332f3bb1578b5b10ac2561247b1d6272ae937Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/5920ac19964f9e20181f63b410d9200ddbf8dc86Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/6bd23e0c2bb6c65d4f5754d1456bc9a4427fc59bPatch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
To clipboard 

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntty: add the option to have a tty reject a new ldisc\n\n... and use it to limit the virtual terminals to just N_TTY.  They are\nkind of special, and in particular, the \"con_write()\" routine violates\nthe \"writes cannot sleep\" rule that some ldiscs rely on.\n\nThis avoids the\n\n   BUG: sleeping function called from invalid context at kernel/printk/printk.c:2659\n\nwhen N_GSM has been attached to a virtual console, and gsmld_write()\ncalls con_write() while holding a spinlock, and con_write() then tries\nto get the console lock."
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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: tty: agregue la opci\u00f3n para que un tty rechace un nuevo ldisc... y util\u00edcelo para limitar las terminales virtuales a solo N_TTY. Son algo especiales y, en particular, la rutina \"con_write()\" viola la regla \"las escrituras no pueden dormir\" en la que se basan algunos ldiscs. Esto evita el ERROR: funci\u00f3n de suspensi\u00f3n llamada desde un contexto no v\u00e1lido en kernel/printk/printk.c:2659 cuando N_GSM se ha conectado a una consola virtual, y gsmld_write() llama a con_write() mientras mantiene un spinlock, y con_write() luego intenta para obtener el bloqueo de la consola."
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  "id": "CVE-2024-40966",
  "lastModified": "2025-11-03T22:17:18.470",
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          "baseScore": 5.5,
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          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
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          "scope": "UNCHANGED",
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