CVE-2021-27365: debian debian_linux Out-of-bounds Write
Vulnerability summary
CVE-2021-27365 is a high (CVSS 7.8) Out-of-bounds Write vulnerability in debian debian_linux. EPSS estimates a 2.10% chance of exploitation in the next 30 days, higher than 81.6% of scored vulnerabilities. 1 public exploit is recorded.
Public exploit (reference, Date unknown)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 49 · Related 26Timeline
- 07-03-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
An issue was discovered in the Linux kernel through 5.11.3. Certain iSCSI data structures do not have appropriate length constraints or checks, and can exceed the PAGE_SIZE value. An unprivileged user can send a Netlink message that is associated with iSCSI, and has a length up to the maximum length of a Netlink message.
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
2.10%
Chance of exploitation in the next 30 days
Percentile
82%
Versus all other CVEs
30-day change
No change 0.00 pp
From 2.10% 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
1 foundExploit Reference (blog.grimm-co.com)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu50 products
- linux< 3.13.0-185.236 | < 4.4.0-206.238 | < 4.15.0-139.143 | < 5.4.0-70.78
- linux-aws< 4.4.0-1088.92 | < 4.4.0-1124.138 | < 4.15.0-1096.103 | < 5.4.0-1041.43
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.3All versions (No fix recorded)
- linux-aws-5.4< 5.4.0-1041.43~18.04.1
Debian2 products
- linux< 5.10.24-1
- debian_linuxEOL9.0
Netapp2 products
Linux1 product
- linux_kernel< 4.4.260 | ≥ 4.5, < 4.9.260 | ≥ 4.10, < 4.14.224 | ≥ 4.15, < 4.19.179 | ≥ 4.20, < 5.4.103 | ≥ 5.5, < 5.10.21 | ≥ 5.11, < 5.11.4
Oracle1 product
- tekelec_platform_distribution≥ 7.4.0, ≤ 7.7.1
5 vendors · 56 products
References
20 links
lists.debian.org/debian-lts-announce/2021/03/msg00010.htmlMailing ListX Refsource MLISTThird Party Advisory- lists.debian.org/debian-lts-announce/2021/03/msg00035.htmlMailing ListX Refsource MLISTThird Party Advisory
- www.openwall.com/lists/oss-security/2021/03/06/1X Refsource MISCREPORTMailing ListThird Party Advisory
- blog.grimm-co.com/2021/03/new-old-bugs-in-linux-kernel.htmlX Refsource MISCExploitThird Party Advisory
- packetstormsecurity.com/files/162117/Kernel-Live-Patch-Security-Notice-LSN-0075-1.htmlX Refsource MISCThird Party AdvisoryVDB Entry
