CVE-2026-89841

Last refreshed2026-10-19

Status: UPDATED | Advisory ID: CVE-2026-89841

Key Details

CVE	CVE-2026-89841
CVSS Score / Version	7.8 (High) / CVSS v3.1
Updated	2026-10-19
CVSS Vector	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`
CVSS Prose	attack vector is local; attack complexity is low; privileges required is low; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products	Linux Kernel

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

In the Linux kernel, the following vulnerability has been resolved:

f2fs: only redirty pinned folios in redirty_blocks

redirty_blocks() pins folios with read_cache_folio() and then walks the

same range again with filemap_lock_folio() to redirty them and drop the

references it took.

Commit 5951fee46bef ("f2fs: Use a folio in redirty_blocks()") changed

the second pass to a do/while loop. If read_cache_folio() fails before

anything is pinned, page_idx does not advance but the cleanup loop still

runs once.

If readahead has already populated the failed folio in page cache, that

extra iteration finds it and folio_put_refs(folio, 2) drops one

reference too many. Later drop_caches or reclaim can then report

"BUG: Bad page state".

Only redirty the range that was pinned successfully. (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-89841
CVE	https://www.cve.org/CVERecord?id=CVE-2026-89841

Source

Reference

NVD

CVE