CVE-2021-47168: NFS: fix an incorrect limit in filelayout_decode_layout()
Vulnerability summary
CVE-2021-47168 is a critical (CVSS 9.8) Out-of-bounds Write vulnerability in linux. EPSS estimates a 0.77% chance of exploitation in the next 30 days, higher than 55.5% of scored vulnerabilities.
Severe, CVSS 9.8 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 6 · Related 6Timeline
- 25-03-2024PublishedVulnerability first disclosed.
- 05-08-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: NFS: fix an incorrect limit in filelayout_decode_layout() The "sizeof(struct nfs_fh)" is two bytes too large and could lead to memory corruption. It should be NFS_MAXFHSIZE because that's the size of the ->data[] buffer. I reversed the size of the arguments to put the variable on the left.
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HDiffers
- NVDNIST5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HDiffers
EPSS trend
Probability
0.77%
Chance of exploitation in the next 30 days
Percentile
56%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.77% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu86 products
- linuxAll versions (No fix recorded) | < 4.15.0-151.157 | < 5.4.0-80.90
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 4.15.0-1109.116 | < 5.4.0-1054.57
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ 16b374ca439fb406e46e071f75428f5b033056f8, < 9d280ab53df1d4a1043bd7a9e7c6a2f9cfbfe040 | ≥ 16b374ca439fb406e46e071f75428f5b033056f8, < b287521e9e94bb342ebe5fd8c3fd7db9aef4e6f1 | ≥ 16b374ca439fb406e46e071f75428f5b033056f8, < f299522eda1566cbfbae4b15c82970fc41b03714 | ≥ 16b374ca439fb406e46e071f75428f5b033056f8, < 945ebef997227ca8c20bad7f8a8358c8ee57a84a | ≥ 16b374ca439fb406e46e071f75428f5b033056f8, < e411df81cd862ef3d5b878120b2a2fef0ca9cdb1 | ≥ 16b374ca439fb406e46e071f75428f5b033056f8, < 9b367fe770b1b80d7bf64ed0d177544a44405f6e | ≥ 16b374ca439fb406e46e071f75428f5b033056f8, < d34fb628f6ef522f996205a9e578216bbee09e84 | ≥ 16b374ca439fb406e46e071f75428f5b033056f8, < 769b01ea68b6c49dc3cde6adf7e53927dacbd3a8 | 2.6.37
- linux_kernel≥ 2.6.37, < 4.4.271 | ≥ 4.5, < 4.9.271 | ≥ 4.10, < 4.14.235 | ≥ 4.15, < 4.19.193 | ≥ 4.20, < 5.4.124 | ≥ 5.5, < 5.10.42 | ≥ 5.11, < 5.12.9 | 5.13:rc1 | 5.13:rc2 | 5.13:rc3
Debian1 product
- linux< 5.14.6-1
3 vendors · 89 products
