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CVE-2024-26906

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: x86/mm: Disallow vsyscall page read for copy_from_kernel_nofault() When trying to use copy_from_kernel_nofault() to read vsysca…

Published Apr 17, 2024EPSS 0.25%

Overview

CVE-2024-26906 is a medium-severity vulnerability. It was published on April 17, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. 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:

x86/mm: Disallow vsyscall page read for copy_from_kernel_nofault()

When trying to use copy_from_kernel_nofault() to read vsyscall page

through a bpf program, the following oops was reported:

BUG: unable to handle page fault for address: ffffffffff600000

#PF: supervisor read access in kernel mode

#PF: error_code(0x0000) - not-present page

PGD 3231067 P4D 3231067 PUD 3233067 PMD 3235067 PTE 0

Oops: 0000 [#1] PREEMPT SMP PTI

CPU: 1 PID: 20390 Comm: test_progs ...... 6.7.0+ #58

Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) ......

RIP: 0010:copy_from_kernel_nofault+0x6f/0x110

......

Call Trace:

<TASK>

? copy_from_kernel_nofault+0x6f/0x110

bpf_probe_read_kernel+0x1d/0x50

bpf_prog_2061065e56845f08_do_probe_read+0x51/0x8d

trace_call_bpf+0xc5/0x1c0

perf_call_bpf_enter.isra.0+0x69/0xb0

perf_syscall_enter+0x13e/0x200

syscall_trace_enter+0x188/0x1c0

do_syscall_64+0xb5/0xe0

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/29bd6f86904682adafe9affbc7f79b14defcaff8Refgit.kernel.org/stable/c/32019c659ecfe1d92e3bf9fcdfbb11a7c70acd58Refgit.kernel.org/stable/c/57f78c46f08198e1be08ffe99c4c1ccc12855bf5Refgit.kernel.org/stable/c/6e4694e65b6db4c3de125115dd4f55848cc48381Refgit.kernel.org/stable/c/e8a67fe34b76a49320b33032228a794f40b0316bRefgit.kernel.org/stable/c/f175de546a3eb77614d94d4c02550181c0a8493eRefgit.kernel.org/stable/c/29bd6f86904682adafe9affbc7f79b14defcaff8Refgit.kernel.org/stable/c/32019c659ecfe1d92e3bf9fcdfbb11a7c70acd58Refgit.kernel.org/stable/c/57f78c46f08198e1be08ffe99c4c1ccc12855bf5Refgit.kernel.org/stable/c/6e4694e65b6db4c3de125115dd4f55848cc48381

How CyberStrike helps

Frequently asked questions

What is CVE-2024-26906?

CVE-2024-26906 is a medium-severity vulnerability. It was published on April 17, 2024 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2024-26906?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2024-26906?

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-2024-26906?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2024-26906 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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