01 Record

CVE-2021-47185

tty: tty_buffer: Fix the softlockup issue in flush_to_ldisc

MediumPUBLISHEDCNA: Linux

CNA base score4.4 CVSS v3.xCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H

View raw JSON

02 Description

tty: tty_buffer: Fix the softlockup issue in flush_to_ldisc

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

0.18% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 7.6% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

NVD analysis status

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

Red Hat severity

Low. 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

2024-04-10 18:56Z2 YR AGO

Last updated

2026-05-11 13:49Z3 MO AGO

Reserved

2024-03-25

Assigning CNA

Linux

Record state

PUBLISHED

Severity

Medium (CVSS 4.4)

CNA CVSS vector

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

Weaknesses

CWE-667Improper LockingClass
CWE-1050Excessive Platform Resource Consumption within a LoopBase

Data version

5.2

Document digest

266f18c34408c187af7cafc18b4210db21dbbc73fd3b3f8e2c731cd7a40baf41

05 Affected products

VendorProductVersionsPlatforms

LinuxLinux81de916f19cf5f1437c0b9ed817364f0f7c81961 to < 0380f643f3a7a61b0845cdc738959c2ad5735d61, 81de916f19cf5f1437c0b9ed817364f0f7c81961 to < b1ffc16ec05ae40d82b6e373322d62e9d6b54fbc, 81de916f19cf5f1437c0b9ed817364f0f7c81961 to < 4c1623651a0936ee197859824cdae6ebbd04d3ed, 81de916f19cf5f1437c0b9ed817364f0f7c81961 to < 4f300f47dbcf9c3d4b2ea76c8554c8f360400725, 81de916f19cf5f1437c0b9ed817364f0f7c81961 to < d491c84df5c469dd9621863b6a770b3428137063, 81de916f19cf5f1437c0b9ed817364f0f7c81961 to < 77e9fed33056f2a88eba9dd4d2d5412f0c7d1f41, 81de916f19cf5f1437c0b9ed817364f0f7c81961 to < 5c34486f04700f1ba04907231dce0cc2705c2d7d, 81de916f19cf5f1437c0b9ed817364f0f7c81961 to < 3968ddcf05fb4b9409cd1859feb06a5b0550a1c1, 3.0—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/0380f643f3a7a61b0845cdc738959c2ad5735d61
git.kernel.orghttps://git.kernel.org/stable/c/b1ffc16ec05ae40d82b6e373322d62e9d6b54fbc
git.kernel.orghttps://git.kernel.org/stable/c/4c1623651a0936ee197859824cdae6ebbd04d3ed
git.kernel.orghttps://git.kernel.org/stable/c/4f300f47dbcf9c3d4b2ea76c8554c8f360400725
git.kernel.orghttps://git.kernel.org/stable/c/d491c84df5c469dd9621863b6a770b3428137063
git.kernel.orghttps://git.kernel.org/stable/c/77e9fed33056f2a88eba9dd4d2d5412f0c7d1f41
git.kernel.orghttps://git.kernel.org/stable/c/5c34486f04700f1ba04907231dce0cc2705c2d7d
git.kernel.orghttps://git.kernel.org/stable/c/3968ddcf05fb4b9409cd1859feb06a5b0550a1c1

01 Record index

CVE-2021-47185

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References

02 Records

CVE-2021-47185

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References