01 Record

CVE-2021-47634

ubi: Fix race condition between ctrl_cdev_ioctl and ubi_cdev_ioctl

HighPUBLISHEDCNA: Linux

CNA base score7.8 CVSS v3.xCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

View raw JSON

02 Description

ubi: Fix race condition between ctrl_cdev_ioctl and ubi_cdev_ioctl

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 ImpacttotalSuccessful exploitation gives total 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

0.29% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 21.7% of scored records. A rank, not a probability.

NVD base score

7.8 (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:H/I:H/A:H

NVD analysis status

Analyzed. 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

2025-02-26 01:54Z1 YR AGO

Last updated

2026-05-23 15:20Z5 MO AGO

Reserved

2025-02-26

Assigning CNA

Linux

Record state

PUBLISHED

Severity

High (CVSS 7.8)

CNA CVSS vector

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

Weaknesses

CWE-416Use After FreeVariant

Data version

5.2

Document digest

06231a9872476f0f82ed7ca17e875df7227becfc4ec1a8da5fded0df4163e3df

05 Affected products

VendorProductVersionsPlatforms

LinuxLinux714fb87e8bc05ff78255afc0dca981e8c5242785 to < f149b1bd213820363731aa119e5011ca892a2aac, 714fb87e8bc05ff78255afc0dca981e8c5242785 to < a8ecee49259f8f78d91ddb329ab2be7e6fd01974, 714fb87e8bc05ff78255afc0dca981e8c5242785 to < d727fd32cbd1abf3465f607021bc9c746f17b5a8, 714fb87e8bc05ff78255afc0dca981e8c5242785 to < 432b057f8e847ae5a2306515606f8d2defaca178, 714fb87e8bc05ff78255afc0dca981e8c5242785 to < 1a3f1cf87054833242fcd0218de0481cf855f888, 714fb87e8bc05ff78255afc0dca981e8c5242785 to < c32fe764191b8ae8b128588beb96e3718d9179d8, 714fb87e8bc05ff78255afc0dca981e8c5242785 to < 5f9e9c223e48c264241d2f34d0bfc29e5fcb5c1b, 714fb87e8bc05ff78255afc0dca981e8c5242785 to < 3cbf0e392f173ba0ce425968c8374a6aa3e90f2e, 016820bde3f0895d09fcad370415085ba0d1bd4a, 12f567db822241090b90c5645ea9146f6cf8fa42, 31b0fca8ab9b9786fe6e5027c4a8587b47db5abf, 6117840dec60344167038f9511c3770d4c096eaa, bd7d3de27e7e1acce2e276074a498a82e0834663, cdf25333b42fb889f086ef65d0734d0dbdc49f4e, ae32d1b98ba29408df87c0ed47877ca0f248eae7, 4056337b1e81a1b137aa562133dc5430cd2fd19e, f3db4c640b32485105554e0bfd16bbde585f6fb0, 3.2.84 to < 3.3, 3.10.103 to < 3.11, 3.12.63 to < 3.13, 3.14.77 to < 3.15, 3.16.39 to < 3.17, 3.18.40 to < 3.19, 4.1.31 to < 4.2, 4.4.19 to < 4.5, 4.7.2 to < 4.8, 4.8—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/f149b1bd213820363731aa119e5011ca892a2aac
git.kernel.orghttps://git.kernel.org/stable/c/a8ecee49259f8f78d91ddb329ab2be7e6fd01974
git.kernel.orghttps://git.kernel.org/stable/c/d727fd32cbd1abf3465f607021bc9c746f17b5a8
git.kernel.orghttps://git.kernel.org/stable/c/432b057f8e847ae5a2306515606f8d2defaca178
git.kernel.orghttps://git.kernel.org/stable/c/1a3f1cf87054833242fcd0218de0481cf855f888
git.kernel.orghttps://git.kernel.org/stable/c/c32fe764191b8ae8b128588beb96e3718d9179d8
git.kernel.orghttps://git.kernel.org/stable/c/5f9e9c223e48c264241d2f34d0bfc29e5fcb5c1b
git.kernel.orghttps://git.kernel.org/stable/c/3cbf0e392f173ba0ce425968c8374a6aa3e90f2e

07 Fixed in

Debian 12

linux
Fixed in 5.17.3-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 13

linux
Fixed in 5.17.3-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.

Debian 14

linux
Fixed in 5.17.3-1

Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.