01 Record

CVE-2021-47506

nfsd: fix use-after-free due to delegation race

CriticalPUBLISHEDCNA: Linux

CNA base score9.8 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

View raw JSON

02 Description

nfsd: fix use-after-free due to delegation race

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

0.78% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 53.4% 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

Modified. NVD last modified this record on 2026-08-04.

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

2024-05-24 15:01Z2 YR AGO

Last updated

2026-08-05 08:48Z1 MO AGO

Reserved

2024-05-22

Assigning CNA

Linux

Record state

PUBLISHED

Severity

Critical (CVSS 9.8)

CNA CVSS vector

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

Weaknesses

CWE-416Use After FreeVariant

Data version

5.2

Document digest

292fec1caa33499678abb680f876b7fa94a257d8dcf2a8a5bc9896d86fac53e9

05 Affected products

VendorProductVersionsPlatforms

LinuxLinuxdff1399f8addf7129c49bb2227469da79cc30b47 to < 04a8d07f3d58308b92630045560799a3faa3ebce, dff1399f8addf7129c49bb2227469da79cc30b47 to < 348714018139c39533c55661a0c7c990671396b4, dff1399f8addf7129c49bb2227469da79cc30b47 to < 33645d3e22720cac1e4548f8fef57bf0649536ee, dff1399f8addf7129c49bb2227469da79cc30b47 to < 2becaa990b93cbd2928292c0b669d3abb6cf06d4, dff1399f8addf7129c49bb2227469da79cc30b47 to < e0759696de6851d7536efddfdd2dfed4c4df1f09, dff1399f8addf7129c49bb2227469da79cc30b47 to < eeb0711801f5e19ef654371b627682aed3b11373, dff1399f8addf7129c49bb2227469da79cc30b47 to < 148c816f10fd11df27ca6a9b3238cdd42fa72cd3, dff1399f8addf7129c49bb2227469da79cc30b47 to < 548ec0805c399c65ed66c6641be467f717833ab5, 3.17—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/04a8d07f3d58308b92630045560799a3faa3ebce
git.kernel.orghttps://git.kernel.org/stable/c/348714018139c39533c55661a0c7c990671396b4
git.kernel.orghttps://git.kernel.org/stable/c/33645d3e22720cac1e4548f8fef57bf0649536ee
git.kernel.orghttps://git.kernel.org/stable/c/2becaa990b93cbd2928292c0b669d3abb6cf06d4
git.kernel.orghttps://git.kernel.org/stable/c/e0759696de6851d7536efddfdd2dfed4c4df1f09
git.kernel.orghttps://git.kernel.org/stable/c/eeb0711801f5e19ef654371b627682aed3b11373
git.kernel.orghttps://git.kernel.org/stable/c/148c816f10fd11df27ca6a9b3238cdd42fa72cd3
git.kernel.orghttps://git.kernel.org/stable/c/548ec0805c399c65ed66c6641be467f717833ab5

01 Record index

CVE-2021-47506

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References

02 Records

CVE-2021-47506

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References