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CVE-2023-53487

7.8 · HIGH

In the Linux kernel, the following vulnerability has been resolved: powerpc/rtas_flash: allow user copy to flash block cache objects With hardened usercopy enabled (CONFIG_HARDENED_USERCOPY=y), u…

Published Oct 1, 2025EPSS 0.16%

Overview

CVE-2023-53487 is a high-severity vulnerability. It was published on October 1, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

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

powerpc/rtas_flash: allow user copy to flash block cache objects

With hardened usercopy enabled (CONFIG_HARDENED_USERCOPY=y), using the

/proc/powerpc/rtas/firmware_update interface to prepare a system

firmware update yields a BUG():

kernel BUG at mm/usercopy.c:102!

Oops: Exception in kernel mode, sig: 5 [#1]

LE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=2048 NUMA pSeries

Modules linked in:

CPU: 0 PID: 2232 Comm: dd Not tainted 6.5.0-rc3+ #2

Hardware name: IBM,8408-E8E POWER8E (raw) 0x4b0201 0xf000004 of:IBM,FW860.50 (SV860_146) hv:phyp pSeries

NIP: c0000000005991d0 LR: c0000000005991cc CTR: 0000000000000000

REGS: c0000000148c76a0 TRAP: 0700 Not tainted (6.5.0-rc3+)

MSR: 8000000000029033 <SF,EE,ME,IR,DR,RI,LE> CR: 24002242 XER: 0000000c

CFAR: c0000000001fbd34 IRQMASK: 0

[ ... GPRs omitted ... ]

NIP usercopy_abort+0xa0/0xb0

LR usercopy_abort+0x9c/0xb0

Call Trace:

usercopy_abort+0x9c/0xb

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/0ba7f969be599e21d4b1f1e947593de6515f4996Refgit.kernel.org/stable/c/1d29e21ed09fa668416fa7721e08d451b9903485Refgit.kernel.org/stable/c/4f3175979e62de3b929bfa54a0db4b87d36257a7Refgit.kernel.org/stable/c/6acb8a453388374fafb3c3b37534b675b2aa0ae1Refgit.kernel.org/stable/c/8ef25fb13494e35c6dbe15445c7875fa92bc3e8bRefgit.kernel.org/stable/c/8f09cc15dcd91d16562400c51d24c7be0d5796faRefgit.kernel.org/stable/c/b8fee83aa4ed3846c7f50a0b364bc699f48d96e5

How CyberStrike helps

Frequently asked questions

What is CVE-2023-53487?

CVE-2023-53487 is a high-severity vulnerability. It was published on October 1, 2025 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2023-53487?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2023-53487?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2023-53487?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2023-53487 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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