CVE-2021-41073: debian debian_linux Release of Invalid Pointer or Reference
Vulnerability summary
CVE-2021-41073 is a high (CVSS 7.8) Release of Invalid Pointer or Reference vulnerability in debian debian_linux. EPSS estimates a 1.77% chance of exploitation in the next 30 days, higher than 78.2% of scored vulnerabilities.
Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 7 · Related 4Timeline
- 19-09-2021PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
loop_rw_iter in fs/io_uring.c in the Linux kernel 5.10 through 5.14.6 allows local users to gain privileges by using IORING_OP_PROVIDE_BUFFERS to trigger a free of a kernel buffer, as demonstrated by using /proc/<pid>/maps for exploitation.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
1.77%
Chance of exploitation in the next 30 days
Percentile
78%
Versus all other CVEs
30-day change
No change 0.00 pp
From 1.77% 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: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu30 products
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11< 5.11.0-1019.20~20.04.1
- linux-aws-5.3All versions (No fix recorded)
- linux-aws-5.8All versions (No fix recorded)
- linux-azureAll versions (No fix recorded)
Debian2 products
- linux< 5.14.6-2
- debian_linuxEOL10.0
Fedoraproject1 product
- fedoraEOL33 | 34
Linux1 product
- linux_kernel≥ 5.10, < 5.10.68 | ≥ 5.11, < 5.14.7
5 vendors · 44 products
References
15 links- www.openwall.com/lists/oss-security/2021/09/18/2Mailing ListX Refsource MLISTREPORTThird Party Advisory
