Buffer overflow in Linux Kernel
CVE-2021-38166
In kernel/bpf/hashtab.c in the Linux kernel through 5.13.8, there is an integer overflow and out-of-bounds write when many elements are placed in a single bucket. NOTE: exploitation might be impractical without the CAP_SYS_ADMIN capability.
Vulnerability class: Integer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.003 (22.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 22nd percentile — 22.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: +0.000
Affected products
- Linux Kernel
- Debian Linux — versions 11.0
- Fedoraproject Fedora — versions 33, 34
Weakness classification (CWE)
Public proof-of-concept exploits
References
- lore.kernel.org/bpf/20210806150419.109658-1-th.yasumatsu@gmail.com/ (Patch)
- git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git/commit/ (Patch, Vendor Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory, Third Party Advisory)
- security.netapp.com/advisory/ntap-20210909-0001/ (Third Party Advisory)
- www.debian.org/security/2021/dsa-4978 (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-38166?
- CVE-2021-38166 is a high-severity vulnerability in Linux Kernel, classified under Integer Overflow or Wraparound. CVSS score: 7.8/10. Published 2021-08-07.
- How severe is CVE-2021-38166?
- High severity. CVSS v3 base score is 7.8 out of 10.
- Is CVE-2021-38166 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.