CVE-2024-42265: linux kernel — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: protect the fetch of ->fd[fd] in do_dup2() from mispredictions both callers have verified that fd is not greater than ->max_fds; however, misprediction might end up with tofree = fdt->fd[fd]; being speculatively executed. That's wrong for the same reasons why it's wrong in close_fd()/file_close_fd_locked(); the same solution applies - array_index_nospec(fd, fdt->max_fds) could differ from fd only in case of speculative execution on mispredicted path.

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CVSS v3.1 Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Products

Vendor	Product	Versions
linux	linux_kernel	< 4.19.320
linux	linux_kernel	4.20 — 5.4.282
linux	linux_kernel	5.5 — 5.10.224
linux	linux_kernel	5.11 — 5.15.165
linux	linux_kernel	5.16 — 6.1.104
linux	linux_kernel	6.2 — 6.6.45
linux	linux_kernel	6.7 — 6.10.4
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/08775b3d6ed117cf4518754ec7300ee42b6a5368 https://git.kernel.org/stable/c/1171ceccabfd596ca370c5d2cbb47d110c3f2fe1 https://git.kernel.org/stable/c/3f480493550b6a23d3a65d095d6569d4a7f56a0f https://git.kernel.org/stable/c/41a6c31df77bd8e050136b0a200b537da9e1084a https://git.kernel.org/stable/c/5db999fff545b924b24c9afd368ef5c17279b176 https://git.kernel.org/stable/c/8aa37bde1a7b645816cda8b80df4753ecf172bf1 https://git.kernel.org/stable/c/da72e783afd27d9f487836b2e6738146c0edd149 https://git.kernel.org/stable/c/ed42e8ff509d2a61c6642d1825032072dab79f26

Other References

https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html https://cert-portal.siemens.com/productcert/html/ssa-265688.html

Frequently Asked Questions

What is CVE-2024-42265? +

In the Linux kernel, the following vulnerability has been resolved: protect the fetch of ->fd[fd] in do_dup2() from mispredictions both callers have verified that fd is not greater than ->max_fds; however, misprediction might end up with tofree = fdt->fd[fd]; being speculatively executed. That's wrong for the same reasons why it's wrong in close_fd()/file_close_fd_locked(); the same solution applies - array_index_nospec(fd, fdt->max_fds) could differ from fd only in case of speculative execution on mispredicted path. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-42265? +

CVE-2024-42265 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2024-42265? +

CVE-2024-42265 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-42265? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2024-42265