CVE-2024-41055

low-risk
Published 2024-07-29

In the Linux kernel, the following vulnerability has been resolved: mm: prevent derefencing NULL ptr in pfn_section_valid() Commit 5ec8e8ea8b77 ("mm/sparsemem: fix race in accessing memory_section->usage") changed pfn_section_valid() to add a READ_ONCE() call around "ms->usage" to fix a race with section_deactivate() where ms->usage can be cleared. The READ_ONCE() call, by itself, is not enough to prevent NULL pointer dereference. We need to check its value before dereferencing it.

Do I need to act?

-
0.01% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.5/10 Medium
LOCAL / LOW complexity

Affected Products (1)

Affected Vendors

Linux

References (13)

Patch https://git.kernel.org/stable/c/0100aeb8a12d51950418e685f879cc80cb8e5982
Patch https://git.kernel.org/stable/c/797323d1cf92d09b7a017cfec576d9babf99cde7
Patch https://git.kernel.org/stable/c/82f0b6f041fad768c28b4ad05a683065412c226e
Patch https://git.kernel.org/stable/c/941e816185661bf2b44b488565d09444ae316509
Patch https://git.kernel.org/stable/c/adccdf702b4ea913ded5ff512239e382d7473b63
Patch https://git.kernel.org/stable/c/bc17f2377818dca643a74499c3f5333500c90503
Patch https://git.kernel.org/stable/c/0100aeb8a12d51950418e685f879cc80cb8e5982
Patch https://git.kernel.org/stable/c/797323d1cf92d09b7a017cfec576d9babf99cde7
Patch https://git.kernel.org/stable/c/82f0b6f041fad768c28b4ad05a683065412c226e
Patch https://git.kernel.org/stable/c/941e816185661bf2b44b488565d09444ae316509
Patch https://git.kernel.org/stable/c/adccdf702b4ea913ded5ff512239e382d7473b63
Patch https://git.kernel.org/stable/c/bc17f2377818dca643a74499c3f5333500c90503
https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
23
/ 100
low-risk
Severity 18/34 · Moderate
Exploitability 0/34 · Minimal
Exposure 5/34 · Minimal