CVE-2024-41055
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…
Does this matter?
Lower severity and a low EPSS score (0.26%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.26% probability · 17th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-476
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/0100aeb8a12d51950418e685f879cc80cb8e5982Patch
- https://git.kernel.org/stable/c/797323d1cf92d09b7a017cfec576d9babf99cde7Patch
- https://git.kernel.org/stable/c/82f0b6f041fad768c28b4ad05a683065412c226ePatch
- https://git.kernel.org/stable/c/941e816185661bf2b44b488565d09444ae316509Patch
- https://git.kernel.org/stable/c/adccdf702b4ea913ded5ff512239e382d7473b63Patch
- https://git.kernel.org/stable/c/bc17f2377818dca643a74499c3f5333500c90503Patch
- https://git.kernel.org/stable/c/0100aeb8a12d51950418e685f879cc80cb8e5982Patch
- https://git.kernel.org/stable/c/797323d1cf92d09b7a017cfec576d9babf99cde7Patch
- https://git.kernel.org/stable/c/82f0b6f041fad768c28b4ad05a683065412c226ePatch
- https://git.kernel.org/stable/c/941e816185661bf2b44b488565d09444ae316509Patch
- https://git.kernel.org/stable/c/adccdf702b4ea913ded5ff512239e382d7473b63Patch
- https://git.kernel.org/stable/c/bc17f2377818dca643a74499c3f5333500c90503Patch
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.