CVE-2024-46744 (GCVE-0-2024-46744)

Vulnerability from cvelistv5 – Published: 2024-09-18 07:12 – Updated: 2026-05-12 11:57
VLAI
Title
Squashfs: sanity check symbolic link size
Summary
In the Linux kernel, the following vulnerability has been resolved: Squashfs: sanity check symbolic link size Syzkiller reports a "KMSAN: uninit-value in pick_link" bug. This is caused by an uninitialised page, which is ultimately caused by a corrupted symbolic link size read from disk. The reason why the corrupted symlink size causes an uninitialised page is due to the following sequence of events: 1. squashfs_read_inode() is called to read the symbolic link from disk. This assigns the corrupted value 3875536935 to inode->i_size. 2. Later squashfs_symlink_read_folio() is called, which assigns this corrupted value to the length variable, which being a signed int, overflows producing a negative number. 3. The following loop that fills in the page contents checks that the copied bytes is less than length, which being negative means the loop is skipped, producing an uninitialised page. This patch adds a sanity check which checks that the symbolic link size is not larger than expected. -- V2: fix spelling mistake.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-29 14:49 UTC
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 6545b246a2c815a8fcd07d58240effb6ec3481b1 , < f82cb7f24032ed023fc67d26ea9bf322d8431a90 (git)
Affected: 6545b246a2c815a8fcd07d58240effb6ec3481b1 , < 1b9451ba6f21478a75288ea3e3fca4be35e2a438 (git)
Affected: 6545b246a2c815a8fcd07d58240effb6ec3481b1 , < 5c8906de98d0d7ad42ff3edf2cb6cd7e0ea658c4 (git)
Affected: 6545b246a2c815a8fcd07d58240effb6ec3481b1 , < 087f25b2d36adae19951114ffcbb7106ed405ebb (git)
Affected: 6545b246a2c815a8fcd07d58240effb6ec3481b1 , < fac5e82ab1334fc8ed6ff7183702df634bd1d93d (git)
Affected: 6545b246a2c815a8fcd07d58240effb6ec3481b1 , < c3af7e460a526007e4bed1ce3623274a1a6afe5e (git)
Affected: 6545b246a2c815a8fcd07d58240effb6ec3481b1 , < ef4e249971eb77ec33d74c5c3de1e2576faf6c90 (git)
Affected: 6545b246a2c815a8fcd07d58240effb6ec3481b1 , < 810ee43d9cd245d138a2733d87a24858a23f577d (git)
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Linux Linux Affected: 2.6.29
Unaffected: 0 , < 2.6.29 (semver)
Unaffected: 4.19.322 , ≤ 4.19.* (semver)
Unaffected: 5.4.284 , ≤ 5.4.* (semver)
Unaffected: 5.10.226 , ≤ 5.10.* (semver)
Unaffected: 5.15.167 , ≤ 5.15.* (semver)
Unaffected: 6.1.110 , ≤ 6.1.* (semver)
Unaffected: 6.6.51 , ≤ 6.6.* (semver)
Unaffected: 6.10.10 , ≤ 6.10.* (semver)
Unaffected: 6.11 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Siemens RUGGEDCOM RST2428P Affected: 0 , < V3.2 (custom)
Create a notification for this product.
Siemens SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family Affected: 0 , < V3.2 (custom)
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Siemens SCALANCE XCM-/XRM-/XCH-/XRH-300 family Affected: 0 , < V3.2 (custom)
Create a notification for this product.
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem Affected: 0 , < * (custom)
Create a notification for this product.
Show details on NVD website
To clipboard 

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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nSquashfs: sanity check symbolic link size\n\nSyzkiller reports a \"KMSAN: uninit-value in pick_link\" bug.\n\nThis is caused by an uninitialised page, which is ultimately caused\nby a corrupted symbolic link size read from disk.\n\nThe reason why the corrupted symlink size causes an uninitialised\npage is due to the following sequence of events:\n\n1. squashfs_read_inode() is called to read the symbolic\n   link from disk.  This assigns the corrupted value\n   3875536935 to inode-\u003ei_size.\n\n2. Later squashfs_symlink_read_folio() is called, which assigns\n   this corrupted value to the length variable, which being a\n   signed int, overflows producing a negative number.\n\n3. The following loop that fills in the page contents checks that\n   the copied bytes is less than length, which being negative means\n   the loop is skipped, producing an uninitialised page.\n\nThis patch adds a sanity check which checks that the symbolic\nlink size is not larger than expected.\n\n--\n\nV2: fix spelling mistake."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: Squashfs: comprobaci\u00f3n de la integridad del tama\u00f1o del enlace simb\u00f3lico Syzkiller informa de un error \"KMSAN: uninit-value in pick_link\". Esto se debe a una p\u00e1gina no inicializada, que en \u00faltima instancia se debe a un tama\u00f1o de enlace simb\u00f3lico da\u00f1ado le\u00eddo desde el disco. La raz\u00f3n por la que el tama\u00f1o de enlace simb\u00f3lico da\u00f1ado provoca una p\u00e1gina no inicializada se debe a la siguiente secuencia de eventos: 1. Se llama a squashfs_read_inode() para leer el enlace simb\u00f3lico desde el disco. Esto asigna el valor da\u00f1ado 3875536935 a inode-\u0026gt;i_size. 2. M\u00e1s tarde se llama a squashfs_symlink_read_folio(), que asigna este valor da\u00f1ado a la variable length, que, al ser un int con signo, se desborda produciendo un n\u00famero negativo. 3. El siguiente bucle que rellena el contenido de la p\u00e1gina comprueba que los bytes copiados sean menores que length, que, al ser negativo, significa que se omite el bucle, lo que produce una p\u00e1gina no inicializada. Este parche agrega una verificaci\u00f3n de cordura que verifica que el tama\u00f1o del enlace simb\u00f3lico no sea mayor al esperado. -- V2: corrige error ortogr\u00e1fico."
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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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.