CVE-2026-53017: f2fs: fix data loss caused by incorrect use of nat_entry flag

criticalCVSS 9.8CVE-2026-53017

CSIRTS triage

vendor: null product: nullOther

What: Data loss can occur due to incorrect use of the nat_entry flag in f2fs.
Who is affected: Users of f2fs are affected by this issue.
Urgency: Critical urgency for remediation due to the high severity of potential data loss.
Action: Implement the fix for the incorrect use of the nat_entry flag.

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

⚡ Watch null

Get an email when a new null advisory drops — max one per day, one-click unsubscribe.

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: critical — CVSS 9.8
Published: 2026-06-09
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-53017

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-2026-530170.16% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 6% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-53017	coverage & exploitation status	NVD · CVE.org

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-2026-53303: In the Linux kernel, the following vulnerability has been resolved: f2fs: protect extension_li…nvd · 2026-06-26
criticalCVE-2026-53018: f2fs: avoid reading already updated pages during GCmsrc · 2026-06-09
highCVE-2026-53303: f2fs: protect extension_list reading with sb_lock in f2fs_sbi_show()msrc · 2026-06-09