CVE-2021-3506: debian debian_linux Out-of-bounds Read
Vulnerability summary
CVE-2021-3506 is a high (CVSS 7.1) Out-of-bounds Read vulnerability in debian debian_linux. EPSS estimates a 0.37% chance of exploitation in the next 30 days, higher than 30.9% 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 9 · Related 6Timeline
- 19-04-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
An out-of-bounds (OOB) memory access flaw was found in fs/f2fs/node.c in the f2fs module in the Linux kernel in versions before 5.12.0-rc4. A bounds check failure allows a local attacker to gain access to out-of-bounds memory leading to a system crash or a leak of internal kernel information. The highest threat from this vulnerability is to system availability.
CVSS metrics
4 scores · 3 sources · 2 versions- 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
EPSS trend
Probability
0.37%
Chance of exploitation in the next 30 days
Percentile
31%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.37% 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.
Ubuntu54 products
- linuxAll versions (No fix recorded) | < 4.4.0-222.255 | < 4.15.0-173.182 | < 5.4.0-77.86
- linux-aws< 4.4.0-1102.107 | < 4.4.0-1138.152 | < 4.15.0-1124.133 | < 5.4.0-1051.53
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.3All versions (No fix recorded)
- linux-aws-5.4< 5.4.0-1051.53~18.04.1
Debian2 products
- linux< 5.10.38-1
- debian_linuxEOL9.0
Linux1 product
- linux_kernelEOL< 4.19.191 | ≥ 4.20, < 5.4.118 | ≥ 5.5, < 5.10.36 | ≥ 5.11, < 5.11.20 | ≥ 5.12, < 5.12.3 | 5.12 | 5.12:rc1 | 5.12:rc2 | 5.12:rc3
4 vendors · 67 products
References
20 links- www.openwall.com/lists/oss-security/2021/03/28/2X Refsource MISCREPORTMailing ListPatchThird Party Advisory
- www.mail-archive.com/linux-kernel%40vger.kernel.org/msg2520013.htmlX Refsource MISCMailing ListThird Party Advisory
- www.openwall.com/lists/oss-security/2021/05/08/1Mailing ListX Refsource MLISTPatchThird Party Advisory
lists.debian.org/debian-lts-announce/2021/06/msg00019.htmlMailing ListX Refsource MLISTThird Party Advisory
