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

pstore/ram: Fix crash when setting number of cpus to an odd number

When the number of cpu cores is adjusted to 7 or other odd numbers,
the zone size will become an odd number.
The address of the zone will become:
addr of zone0 = BASE
addr of zone1 = BASE + zone_size
addr of zone2 = BASE + zone_size*2
...
The address of zone1/3/5/7 will be mapped to non-alignment va.
Eventually crashes will occur when accessing these va.

So, use ALIGN_DOWN() to make sure the zone size is even
to avoid this bug.

References

• https://nvd.nist.gov/vuln/detail/CVE-2023-52619
• https://git.kernel.org/stable/c/0593cfd321df9001142a9d2c58d4144917dff7ee
• https://git.kernel.org/stable/c/2a37905d47bffec61e95d99f0c1cc5dc6377956c
• https://git.kernel.org/stable/c/75b0f71b26b3ad833c5c0670109c0af6e021e86a
• https://git.kernel.org/stable/c/8b69c30f4e8b69131d92096cb296dc1f217101e4
• https://git.kernel.org/stable/c/a63e48cd835c34c38ef671d344cc029b1ea5bf10
• https://git.kernel.org/stable/c/cd40e43f870cf21726b22487a95ed223790b3542
• https://git.kernel.org/stable/c/d49270a04623ce3c0afddbf3e984cb245aa48e9c
• https://git.kernel.org/stable/c/e9f6ac50890104fdf8194f2865680689239d30fb
• https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
• https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html