CVE-2024-26603 (GCVE-0-2024-26603)

Vulnerability from cvelistv5 – Published: 2024-02-24 14:56 – Updated: 2026-05-11 20:00
VLAI?
Title
x86/fpu: Stop relying on userspace for info to fault in xsave buffer
Summary
In the Linux kernel, the following vulnerability has been resolved: x86/fpu: Stop relying on userspace for info to fault in xsave buffer Before this change, the expected size of the user space buffer was taken from fx_sw->xstate_size. fx_sw->xstate_size can be changed from user-space, so it is possible construct a sigreturn frame where: * fx_sw->xstate_size is smaller than the size required by valid bits in fx_sw->xfeatures. * user-space unmaps parts of the sigrame fpu buffer so that not all of the buffer required by xrstor is accessible. In this case, xrstor tries to restore and accesses the unmapped area which results in a fault. But fault_in_readable succeeds because buf + fx_sw->xstate_size is within the still mapped area, so it goes back and tries xrstor again. It will spin in this loop forever. Instead, fault in the maximum size which can be touched by XRSTOR (taken from fpstate->user_size). [ dhansen: tweak subject / changelog ]
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: fcb3635f5018e53024c6be3c3213737f469f74ff , < 8bd3eee7720c14b59a206bd05b98d7586bccf99a (git)
Affected: fcb3635f5018e53024c6be3c3213737f469f74ff , < 627339cccdc9166792ecf96bc3c9f711a60ce996 (git)
Affected: fcb3635f5018e53024c6be3c3213737f469f74ff , < b2479ab426cef7ab79a13005650eff956223ced2 (git)
Affected: fcb3635f5018e53024c6be3c3213737f469f74ff , < 627e28cbb65564e55008315d9e02fbb90478beda (git)
Affected: fcb3635f5018e53024c6be3c3213737f469f74ff , < d877550eaf2dc9090d782864c96939397a3c6835 (git)
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Linux Linux Affected: 5.14
Unaffected: 0 , < 5.14 (semver)
Unaffected: 5.15.150 , ≤ 5.15.* (semver)
Unaffected: 6.1.79 , ≤ 6.1.* (semver)
Unaffected: 6.6.18 , ≤ 6.6.* (semver)
Unaffected: 6.7.6 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
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It will spin in this loop forever.\\n\\nInstead, fault in the maximum size which can be touched by XRSTOR (taken\\nfrom fpstate-\u003euser_size).\\n\\n[ dhansen: tweak subject / changelog ]\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: x86/fpu: dejar de depender del espacio de usuario para que la informaci\u00f3n falle en el b\u00fafer xsave Antes de este cambio, el tama\u00f1o esperado del b\u00fafer de espacio de usuario se tomaba de fx_sw-\u0026gt;xstate_size. fx_sw-\u0026gt;xstate_size se puede cambiar desde el espacio de usuario, por lo que es posible construir un marco sigreturn donde: * fx_sw-\u0026gt;xstate_size es m\u00e1s peque\u00f1o que el tama\u00f1o requerido por los bits v\u00e1lidos en fx_sw-\u0026gt;xfeatures. * el espacio de usuario desasigna partes del b\u00fafer fpu de sigrame para que no se pueda acceder a todo el b\u00fafer requerido por xrstor. En este caso, xrstor intenta restaurar y accede al \u00e1rea no asignada, lo que genera una falla. Pero falla_in_readable tiene \u00e9xito porque buf + fx_sw-\u0026gt;xstate_size est\u00e1 dentro del \u00e1rea a\u00fan mapeada, por lo que regresa e intenta xrstor nuevamente. Girar\u00e1 en este bucle para siempre. En cambio, falla en el tama\u00f1o m\u00e1ximo que XRSTOR puede tocar (tomado de fpstate-\u0026gt;user_size). 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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.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • 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.