FKIE_CVE-2024-40913

Vulnerability from fkie_nvd - Published: 2024-07-12 13:15 - Updated: 2025-11-03 22:17
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: cachefiles: defer exposing anon_fd until after copy_to_user() succeeds After installing the anonymous fd, we can now see it in userland and close it. However, at this point we may not have gotten the reference count of the cache, but we will put it during colse fd, so this may cause a cache UAF. So grab the cache reference count before fd_install(). In addition, by kernel convention, fd is taken over by the user land after fd_install(), and the kernel should not call close_fd() after that, i.e., it should call fd_install() after everything is ready, thus fd_install() is called after copy_to_user() succeeds.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4b4391e77a6bf24cba2ef1590e113d9b73b11039Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b9f58cdae6a364a3270fd6b6a46e0fd4f7f8ce32Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d2d3eb377a5d081bf2bed177d354a4f59b74da88Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/eac51d9daacd61dcc93333ff6a890cf3efc8c1c0Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/4b4391e77a6bf24cba2ef1590e113d9b73b11039Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/b9f58cdae6a364a3270fd6b6a46e0fd4f7f8ce32Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/d2d3eb377a5d081bf2bed177d354a4f59b74da88Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/eac51d9daacd61dcc93333ff6a890cf3efc8c1c0Patch
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 *
linux linux_kernel 6.10
linux linux_kernel 6.10
linux linux_kernel 6.10
To clipboard 

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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncachefiles: defer exposing anon_fd until after copy_to_user() succeeds\n\nAfter installing the anonymous fd, we can now see it in userland and close\nit. However, at this point we may not have gotten the reference count of\nthe cache, but we will put it during colse fd, so this may cause a cache\nUAF.\n\nSo grab the cache reference count before fd_install(). In addition, by\nkernel convention, fd is taken over by the user land after fd_install(),\nand the kernel should not call close_fd() after that, i.e., it should call\nfd_install() after everything is ready, thus fd_install() is called after\ncopy_to_user() succeeds."
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  "id": "CVE-2024-40913",
  "lastModified": "2025-11-03T22:17:13.423",
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  "published": "2024-07-12T13:15:14.457",
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Sightings

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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.
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  • 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.