CVE-2023-31436 Memory corruption in n/a
An out-of-bounds write in the Linux kernel's QFQ scheduler allows attackers to execute arbitrary code or escalate privileges.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-31436?
CVE-2023-31436 is a high-severity memory corruption vulnerability in Linux kernel, published on 28 Apr 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
qfq_change_class in net/sched/sch_qfq.c in the Linux kernel before 6.2.13 allows an out-of-bounds write because lmax can exceed QFQ_MIN_LMAX.
Weakness: CWE-787
Which versions are affected by CVE-2023-31436?
It affects 1 product.
Linux distribution packages (6)
kgraft-patch-SLE12-SP4_Update_35 SUSE:Linux Enterprise Live Patching 12 SP4 | All versions | 2-2.1 |
kernel-livepatch-SLE15-SP2_Update_35 SUSE:Linux Enterprise Live Patching 15 SP2 | All versions | 3-150200.2.1 |
kernel-livepatch-SLE15-SP2_Update_36 SUSE:Linux Enterprise Live Patching 15 SP2 | All versions | 3-150200.2.1 |
kernel-livepatch-SLE15-SP3_Update_31 SUSE:Linux Enterprise Live Patching 15 SP3 | All versions | 3-150300.2.1 |
kernel-livepatch-SLE15-SP3_Update_32 SUSE:Linux Enterprise Live Patching 15 SP3 | All versions | 3-150300.2.1 |
kernel-livepatch-SLE15-SP4_Update_11 SUSE:Linux Enterprise Live Patching 15 SP4 | All versions | 3-150400.2.2 |
Products include Linux kernel.
How do I fix CVE-2023-31436?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2023-31436 being exploited?
There is no known exploitation of CVE-2023-31436 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-26391, AZL-26668, CVE-2023-2248, CVE-2023-39190, DEBIAN-CVE-2023-31436, GHSA-rwg2-cqg5-rjm4 and 5 more.