01 Record

CVE-2025-21857

net/sched: cls_api: fix error handling causing NULL dereference

MediumPUBLISHEDCNA: Linux

CNA base score5.5 CVSS v3.xCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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02 Description

net/sched: cls_api: fix error handling causing NULL dereference

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.21% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 11.8% of scored records. A rank, not a probability.

NVD base score

5.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2025-03-12 09:42Z1 YR AGO

Last updated

2026-05-11 21:07Z3 MO AGO

Reserved

2024-12-29

Assigning CNA

Linux

Record state

PUBLISHED

Severity

Medium (CVSS 5.5)

CNA CVSS vector

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

Weaknesses

CWE-476NULL Pointer DereferenceBase

Data version

5.2

Document digest

0adbe03be1dd049ba9ff979baaa282ed8ee9592153099fa7b97f59f5045828a3

05 Affected products

VendorProductVersionsPlatforms

LinuxLinux80cd22c35c9001fe72bf614d29439de41933deca to < de4b679aa3b4da7ec34f639df068b914f20e3c3c, 80cd22c35c9001fe72bf614d29439de41933deca to < 3e4c56cf41876ef2a82f0877fe2a67648f8632b8, 80cd22c35c9001fe72bf614d29439de41933deca to < 3c74b5787caf59bb1e9c5fe0a360643a71eb1e8a, 80cd22c35c9001fe72bf614d29439de41933deca to < 071ed42cff4fcdd89025d966d48eabef59913bf2, 6.3—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/de4b679aa3b4da7ec34f639df068b914f20e3c3c
git.kernel.orghttps://git.kernel.org/stable/c/3e4c56cf41876ef2a82f0877fe2a67648f8632b8
git.kernel.orghttps://git.kernel.org/stable/c/3c74b5787caf59bb1e9c5fe0a360643a71eb1e8a
git.kernel.orghttps://git.kernel.org/stable/c/071ed42cff4fcdd89025d966d48eabef59913bf2

01 Record index

CVE-2025-21857

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References

02 Records

CVE-2025-21857

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References