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Linux Distros Unpatched Vulnerability : CVE-2026-89836

high Nessus Plugin ID 346708

Synopsis

The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be patched.

Description

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

 - f2fs: fix folio_nr_pages() race after put in large folio invalidate Our v6.18 based Android system is continuely suffering livelock and bad page stat as shown in[1] which related to broken xarray slot status.
 By investigating big folio operations within f2fs, we find below races and fix it by get the nr_pages before drop the refcount and folio_lock. f2fs_get_read_data_folio() calls f2fs_folio_put() before folio_nr_pages() when invalidating a large folio from the page cache. That unlocks the folio and drops the caller reference, leaving a window where a concurrent truncate or folio split can shrink the compound folio or free it before the invalidate range is computed. An undersized range then leaves split sub-folios in mapping->i_pages, which can later interact badly with truncate and reclaim (stale xarray entries and bad page state when folio->mapping no longer matches the mapping being truncated). [1] PID: 2594 TASK:
 ffffff8169b81580 CPU: 7 COMMAND: Thread-3 #0 [ffffffc08ef2b8a0] xas_load at ffffffe52d1f42a4 #1 [ffffffc08ef2b900] find_get_entries at ffffffe52c185798 #2 [ffffffc08ef2bb60] truncate_inode_pages_range at ffffffe52c19e83c #3 [ffffffc08ef2bbc0] truncate_inode_pages_final at ffffffe52c19ec2c #4 [ffffffc08ef2bc20] f2fs_evict_inode at ffffffe52c4c8400 #5 [ffffffc08ef2bcc0] evict at ffffffe52c2de9f4 #6 [ffffffc08ef2bd00] iput at ffffffe52c2db1b4 #7 [ffffffc08ef2bd30] dentry_unlink_inode at ffffffe52c2d7204 #8 [ffffffc08ef2bd50] __dentry_kill at ffffffe52c2d3dcc #9 [ffffffc08ef2bd80] dput at ffffffe52c2d3c3c #10 [ffffffc08ef2bda0] __fput at ffffffe52c2b0a7c #11 [ffffffc08ef2bde0] ____fput at ffffffe52c2b1034 #12 [ffffffc08ef2bdf0] task_work_run at ffffffe52beea200 #13 [ffffffc08ef2be20] exit_to_user_mode_loop at ffffffe52bfbc17c #14 [ffffffc08ef2be80] el0_svc at ffffffe52d1f8e54 #15 [ffffffc08ef2beb0] el0t_64_sync_handler at ffffffe52d1f8d10 (CVE-2026-89836)

Note that Nessus relies on the presence of the package as reported by the vendor.

Solution

There is no known solution at this time.

See Also

https://security-tracker.debian.org/tracker/CVE-2026-89836

Plugin Details

Severity: High

ID: 346708

File Name: unpatched_CVE_2026_89836.nasl

Version: 1.1

Type: Local

Agent: unix

Family: Misc.

Published: 9/16/2026

Updated: 9/16/2026

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.21

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS Score Source: CVE-2026-89836

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 7.1

Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:U/RC:C

Vulnerability Information

CPE: cpe:/o:debian:debian_linux:14.0, p-cpe:/a:debian:debian_linux:linux

Required KB Items: Host/local_checks_enabled, Host/cpu, global_settings/vendor_unpatched, Host/OS/identifier

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 9/16/2026

Reference Information

CVE: CVE-2026-89836