Buffer overflow in Linux Kernel
CVE-2023-3611
An out-of-bounds write vulnerability in the Linux kernel's net/sched: sch_qfq component can be exploited to achieve local privilege escalation. The qfq_change_agg() function in net/sched/sch_qfq.c allows an out-of-bounds write because lmax is updated according to packet sizes without bounds checks. We recommend upgrading past commit 3e337087c3b5805fe0b8a46ba622a962880b5d64.
Vulnerability class: Buffer 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 (18.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 18th percentile — 18.0% 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 — versions 3.8
- Linux Kernel — versions 6.5
- Debian Linux — versions 10.0, 11.0, 12.0
Weakness classification (CWE)
References
- git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/ (Patch, Mailing List, patch, Vendor Advisory)
- kernel.dance/3e337087c3b5805fe0b8a46ba622a962880b5d64 (Patch, Vendor Advisory)
- www.debian.org/security/2023/dsa-5480 (Third Party Advisory)
- security.netapp.com/advisory/ntap-20230908-0002/ (Third Party Advisory)
- www.debian.org/security/2023/dsa-5492 (Third Party Advisory)
- lists.debian.org/debian-lts-announce/2023/10/msg00027.html (Mailing List, Third Party Advisory)
- lists.debian.org/debian-lts-announce/2024/01/msg00004.html (Mailing List)
Frequently asked questions
- What is CVE-2023-3611?
- CVE-2023-3611 is a high-severity vulnerability in Linux Kernel, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2023-07-21.
- How severe is CVE-2023-3611?
- High severity. CVSS v3 base score is 7.8 out of 10.