CVE-2024-42265

protect the fetch of ->fd[fd] in do_dup2() from mispredictions

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.

N/A

CVSS

Severity:

EPSS 0.34%

Affected: Linux Linux

References

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

Frequently Asked Questions

What is the severity of CVE-2024-42265?: CVE-2024-42265 has not yet been assigned a CVSS score.
How to fix CVE-2024-42265?: To fix CVE-2024-42265, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2024-42265 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2024-42265 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2024-42265?: CVE-2024-42265 affects Linux Linux, Linux Linux.

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