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CVE-2023-3611

HIGHCVSS 7.8/10EPSS 0.27%

Last modified

CVE-2023-3611 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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.. EPSS estimates a 0.27% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1
7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
0.27%

19.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersionsUpdate
LinuxLinux Kernel>= 3.8, < 4.14.322—
LinuxLinux Kernel>= 4.15, < 4.19.291—
LinuxLinux Kernel>= 4.20, < 5.4.253—
LinuxLinux Kernel>= 5.5, < 5.10.188—
LinuxLinux Kernel>= 5.11, < 5.15.121—
LinuxLinux Kernel>= 5.16, < 6.1.40—
LinuxLinux Kernel>= 6.2, < 6.4.5—
LinuxLinux Kernel6.5Rc1
DebianDebian Linux10.0—
DebianDebian Linux11.0—
DebianDebian Linux12.0—

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is 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.
How severe is CVE-2023-3611?
CVE-2023-3611 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.27% probability of exploitation in the next 30 days.
How do I fix CVE-2023-3611?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-3611?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST