CVE-2024-49859: f2fs: fix to check atomic_file in f2fs ioctl interfaces

mediumCVSS 4.7CVE-2024-49859

CSIRTS triage

vendor: Linux product: Linux kernel Privilege escalation

What: f2fs ioctl interfaces do not validate atomic_file status allowing unauthorized operations.
Who is affected: Deployments using f2fs filesystem on affected Linux kernel versions.
Urgency: Medium priority; not exploited but allows privilege escalation through ioctl abuse.
Action: Apply Linux kernel patch to add atomic_file validation in f2fs ioctl handlers.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: medium — CVSS 4.7
Published: 2026-08-06
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2024-49859

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2024-498590.17% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 6% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2024-49859	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

medium[UPDATE] [medium] Linux Kernel: Multiple vulnerabilities allow denial of servicecert-bund

Recent advisories for f2fs

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

unknownCVE-2026-68460: In the Linux kernel, the following vulnerability has been resolved: f2fs: fix potential deadlo…nvd · 2026-08-15
unknownCVE-2026-68459: In the Linux kernel, the following vulnerability has been resolved: f2fs: fix potential deadlo…nvd · 2026-08-15
mediumCVE-2022-49742: f2fs: initialize locks earlier in f2fs_fill_super()msrc · 2026-08-06
mediumCVE-2026-46175: f2fs: fix fsck inconsistency caused by FGGC of node blockmsrc · 2026-08-06
mediumCVE-2024-40969: f2fs: don't set RO when shutting down f2fsmsrc · 2026-08-06
mediumCVE-2025-38333: f2fs: fix to bail out in get_new_segment()msrc · 2026-08-06