CVE-2024-44947

Status: ModifiedMedium (5.5)—PoC

Severity5.5Medium · CVSS 3.1

Exploitation probability0.89 %higher than 59% of CVEs

Active exploitationNonot in the CISA catalog

Public exploitAvailableProof of concept on GitHub (unverified)

In the Linux kernel, the following vulnerability has been resolved:

fuse: Initialize beyond-EOF page contents before setting uptodate

fuse_notify_store(), unlike fuse_do_readpage(), does not enable page zeroing (because it can be used to change partial page contents).

So fuse_notify_store() must be more careful to fully initialize page contents (including parts of the page that are beyond end-of-file) before marking the page uptodate.

The current code can leave beyond-EOF page contents uninitialized, which makes these uninitialized page contents visible to userspace via mmap().

This is an information leak, but only affects systems which do not enable init-on-alloc (via CONFIG_INIT_ON_ALLOC_DEFAULT_ON=y or the corresponding kernel command line parameter).

CVSS

Base score: 5.5
Version: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 0.89 %
Percentile among all scored CVEs: 59
Score date: 10/20/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Public exploits

Exploit code or detection templates are publicly available. This is not the same as confirmed active exploitation (KEV), but it raises the risk: patch with priority.

Proof of concept on GitHub (unverified) · List of proofs of concept on GitHub

⚠️ GitHub proofs of concept are not verified: some are fake or contain malware. Never run them outside an isolated lab.

Affected technologies (1)

Linux — Linux Kernel

CWEs

CWE-665

References

Show 11 references

Raw JSON (NVD)

Show

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfuse: Initialize beyond-EOF page contents before setting uptodate\n\nfuse_notify_store(), unlike fuse_do_readpage(), does not enable page\nzeroing (because it can be used to change partial page contents).\n\nSo fuse_notify_store() must be more careful to fully initialize page\ncontents (including parts of the page that are beyond end-of-file)\nbefore marking the page uptodate.\n\nThe current code can leave beyond-EOF page contents uninitialized, which\nmakes these uninitialized page contents visible to userspace via mmap().\n\nThis is an information leak, but only affects systems which do not\nenable init-on-alloc (via CONFIG_INIT_ON_ALLOC_DEFAULT_ON=y or the\ncorresponding kernel command line parameter)."
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      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: fuse: inicializar el contenido de la página más allá del EOF antes de configurar uptodate fuse_notify_store(), a diferencia de fuse_do_readpage(), no habilita la puesta a cero de la página (porque se puede usar para cambiar el contenido parcial de la página). Por lo tanto, fuse_notify_store() debe ser más cuidadoso para inicializar por completo el contenido de la página (incluidas las partes de la página que están más allá del fin del archivo) antes de marcar la página como actualizada. El código actual puede dejar el contenido de la página más allá del EOF sin inicializar, lo que hace que este contenido de página no inicializado sea visible para el espacio de usuario a través de mmap(). Esta es una fuga de información, pero solo afecta a los sistemas que no habilitan init-on-alloc (a través de CONFIG_INIT_ON_ALLOC_DEFAULT_ON=y o el parámetro de línea de comandos del kernel correspondiente)."
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