logo_clicknbuy.png

CVE-2025-21691 – Linux Kernel cachestat Permission Checking Vulnerability

The following table lists the changes that have been made to the
CVE-2025-21691 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution
of a vulnerability, and for identifying the most recent changes that may
impact the vulnerability’s severity, exploitability, or other characteristics.

  • New CVE Received
    by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Feb. 10, 2025

    Action Type Old Value New Value
    Added Description In the Linux kernel, the following vulnerability has been resolved:

    cachestat: fix page cache statistics permission checking

    When the ‘cachestat()’ system call was added in commit cf264e1329fb
    (“cachestat: implement cachestat syscall”), it was meant to be a much
    more convenient (and performant) version of mincore() that didn’t need
    mapping things into the user virtual address space in order to work.

    But it ended up missing the “check for writability or ownership” fix for
    mincore(), done in commit 134fca9063ad (“mm/mincore.c: make mincore()
    more conservative”).

    This just adds equivalent logic to ‘cachestat()’, modified for the file
    context (rather than vma).
    Added Reference https://git.kernel.org/stable/c/5f537664e705b0bf8b7e329861f20128534f6a83
    Added Reference https://git.kernel.org/stable/c/780ab8329672464984cf1344bd5c3993af0226c7
    Added Reference https://git.kernel.org/stable/c/7d6405c13b0d8a8367cd8df63f118b619a3f0dd2
    Added Reference https://git.kernel.org/stable/c/97153a05077f618f7471f50a78158602badccb30
Share the Post:

Related Posts