01 Record

CVE-2021-47636

ubifs: Fix read out-of-bounds in ubifs_wbuf_write_nolock()

HighPUBLISHEDCNA: Linux

CNA base score7.1 CVSS v3.xCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

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02 Description

ubifs: Fix read out-of-bounds in ubifs_wbuf_write_nolock()

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

0.25% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 16.3% of scored records. A rank, not a probability.

NVD base score

7.1 (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: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

2025-02-26 01:54Z1 YR AGO

Last updated

2026-08-05 08:48Z1 MO AGO

Reserved

2025-02-26

Assigning CNA

Linux

Record state

PUBLISHED

Severity

High (CVSS 7.1)

CNA CVSS vector

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

Weaknesses

CWE-125Out-of-bounds ReadBase

Data version

5.2

Document digest

fce41dd9e68129f6e0d26fa4119e91f29f09bcf8a3dce3840819e2cd5da2242c

05 Affected products

VendorProductVersionsPlatforms

LinuxLinux1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d to < 5343575aa11c5d7044107d59d43f84aec01312b0, 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d to < b80ccbec0e4804436c382d7dd60e943c386ed83a, 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d to < 07a209fadee7b53b46858538e1177597273862e4, 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d to < a7054aaf1909cf40489c0ec1b728fdcf79c751a6, 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d to < e09fa5318d51f522e1af4fbaf8f74999355980c8, 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d to < 3b7fb89135a20587d57f8877c02e25003e9edbdf, 1e51764a3c2ac05a23a22b2a95ddee4d9bffb16d to < 4f2262a334641e05f645364d5ade1f565c85f20b, 2.6.27—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/5343575aa11c5d7044107d59d43f84aec01312b0
git.kernel.orghttps://git.kernel.org/stable/c/b80ccbec0e4804436c382d7dd60e943c386ed83a
git.kernel.orghttps://git.kernel.org/stable/c/07a209fadee7b53b46858538e1177597273862e4
git.kernel.orghttps://git.kernel.org/stable/c/a7054aaf1909cf40489c0ec1b728fdcf79c751a6
git.kernel.orghttps://git.kernel.org/stable/c/e09fa5318d51f522e1af4fbaf8f74999355980c8
git.kernel.orghttps://git.kernel.org/stable/c/3b7fb89135a20587d57f8877c02e25003e9edbdf
git.kernel.orghttps://git.kernel.org/stable/c/4f2262a334641e05f645364d5ade1f565c85f20b

01 Record index

CVE-2021-47636

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References

02 Records

CVE-2021-47636

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References