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Review reviewHigh

CVE-2025-39881

Linux Linux, linux kernel, debian linux

In the Linux kernel, the following vulnerability has been resolved: kernfs: Fix UAF in polling when open file is released A use-after-free (UAF) vulnerability was identified in the PSI (Pressure Stall Information) monitoring mechanism: BUG: KASAN: slab-use-after-free in psi_trigger_poll+0x3c/0x140 Read of size 8 at addr ffff3de3d50bd308 by task systemd/1 psi_trigger_poll+0x3c/0x140 cgroup_pressure_poll+0x70/0xa0 cgroup_file_poll+0x8c/0x100 kernfs_fop_poll+0x11c/0x1c0 ep_item_poll.isra.0+0x188/0x2c0 Allocated by task 1: cgroup_file_open+0x88/0x388 kernfs_fop_open+0x73c/0xaf0 do_dentry_open+0...

CVSS
7.8
EPSS
0.14%
3.83% percentile
CISA KEV
Not listed
Published
2025.09.23
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.14%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: kernfs: Fix UAF in polling when open file is released A use-after-free (UAF) vulnerability was identified in the PSI (Pressure Stall Information) monitoring mechanism: BUG: KASAN: slab-use-after-free in psi_trigger_poll+0x3c/0x140 Read of size 8 at addr ffff3de3d50bd308 by task systemd/1 psi_trigger_poll+0x3c/0x140 cgroup_pressure_poll+0x70/0xa0 cgroup_file_poll+0x8c/0x100 kernfs_fop_poll+0x11c/0x1c0 ep_item_poll.isra.0+0x188/0x2c0 Allocated by task 1: cgroup_file_open+0x88/0x388 kernfs_fop_open+0x73c/0xaf0 do_dentry_open+0...

Affected product and versions

Product
Linux Linux, linux kernel, debian linux
Affected versions
>= 34f26a15611afb03c33df6819359d36f5b382589 < 34d9cafd469c69ad85e6a36b4303c78382cf5c79, >= 34f26a15611afb03c33df6819359d36f5b382589 < 854baafc00c433cccbe0ab4231b77aeb9b637b77, >= 34f26a15611afb03c33df6819359d36f5b382589 < 7e64474aba78d240f7804f48f2d454dcca78b15f, >= 34f26a15611afb03c33df6819359d36f5b382589 < ac5cda4fae8818cf1963317bb699f7f2f85b60af, >= 34f26a15611afb03c33df6819359d36f5b382589 < 3c9ba2777d6c86025e1ba4186dc5cd930e40ec5f, >= 6.1, >= 6.1 < 6.1.153, >= 6.2 < 6.6.107, >= 6.7 < 6.12.48, >= 6.13 < 6.16.8, 6.17, 11.0
Fixed versions
6.1.153, 6.6.107, 6.12.48, 6.16.8

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel, debian linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-416