CVE-2021-47403: ipack: ipoctal: fix module reference leak
Vulnerability summary
CVE-2021-47403 is a high (CVSS 7.1) vulnerability in linux. EPSS estimates a 0.25% chance of exploitation in the next 30 days, higher than 16.2% of scored vulnerabilities.
Not severe (CVSS 7.1, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 8 · Related 8Timeline
- 21-05-2024PublishedVulnerability first disclosed.
- 11-05-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: ipack: ipoctal: fix module reference leak A reference to the carrier module was taken on every open but was only released once when the final reference to the tty struct was dropped. Fix this by taking the module reference and initialising the tty driver data when installing the tty.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated7.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
- NVDNIST7.1HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
EPSS trend
Probability
0.25%
Chance of exploitation in the next 30 days
Percentile
16%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.25% 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: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu87 products
- linuxAll versions (No fix recorded) | < 4.15.0-163.171 | < 5.4.0-91.102
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 4.15.0-1116.123 | < 5.4.0-1060.63
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ 82a82340bab6c251e0705339f60763718eaa2a22, < 31398849b84ebae0d43a1cf379cb9895597f221a | ≥ 82a82340bab6c251e0705339f60763718eaa2a22, < c0adb5a947dec6cff7050ec56d78ecd3916f9ce6 | ≥ 82a82340bab6c251e0705339f60763718eaa2a22, < dde4c1429b97383689f755ce92b4ed1e84a9c92b | ≥ 82a82340bab6c251e0705339f60763718eaa2a22, < 9c5b77a7ffc983b2429ce158b50497c5d3c86a69 | ≥ 82a82340bab6c251e0705339f60763718eaa2a22, < 3253c87e1e5bc0107aab773af2f135ebccf38666 | ≥ 82a82340bab6c251e0705339f60763718eaa2a22, < 7cea848678470daadbfdaa6a112b823c290f900c | ≥ 82a82340bab6c251e0705339f60763718eaa2a22, < 811178f296b16af30264def74c8d2179a72d5562 | ≥ 82a82340bab6c251e0705339f60763718eaa2a22, < bb8a4fcb2136508224c596a7e665bdba1d7c3c27 | 3.18
- linux_kernel≥ 3.18, < 4.4.286 | ≥ 4.5, < 4.9.285 | ≥ 4.10, < 4.14.249 | ≥ 4.15, < 4.19.209 | ≥ 4.20, < 5.4.151 | ≥ 5.5, < 5.10.71 | ≥ 5.11, < 5.14.10 | 5.15:rc1 | 5.15:rc2 | 5.15:rc3
Debian1 product
- linux< 5.14.12-1
3 vendors · 90 products
