CVE-2026-53303: f2fs: protect extension_list reading with sb_lock in f2fs_sbi_show()

highCVSS 7.1CVE-2026-53303

CSIRTS triage

Other

What: The extension_list reading is now protected with sb_lock in f2fs_sbi_show().
Who is affected: Deployments using f2fs are affected.
Urgency: Remediation is high urgency due to the potential for data corruption.
Action: Update to the version that includes the sb_lock protection.

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

Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 7.1
Published: 2026-06-09
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-53303

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-2026-533030.13% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 3% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-53303	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

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-2026-53017: f2fs: fix data loss caused by incorrect use of nat_entry flagmsrc · 2026-06-09
criticalCVE-2026-53018: f2fs: avoid reading already updated pages during GCmsrc · 2026-06-09