Medium [CVE-2023-6121] Kernel: nvme: info leak due to out-of-bounds read in nvmet_ctrl_find_get
This medium-severity Red Hat Linux advisory covers CVE-2023-6121 affecting Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 6.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
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Summary
An out-of-bounds read vulnerability was found in the NVMe-oF/TCP subsystem in the Linux kernel. This issue may allow a remote attacker to send a crafted TCP packet, triggering a heap-based buffer overflow that results in kmalloc data being printed and potentially leaked to the kernel ring buffer (dmesg).
Red Hat severity: Low — CVSS 4.3 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N). Weakness: CWE-125.
Affected Red Hat products: Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7. Will not fix / out of support: Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7.
Red Hat fixing advisory: RHSA-2024:2950, RHSA-2024:3138, RHSA-2024:2394.
Affected products named by the advisory: Red Hat package: kernel-rt.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · high-confidence parse· fetched 9 hours ago·verify at source
- kernel-rt-0:4.18.0-553.rt7.342.el8_10
- kernel-0:4.18.0-553.el8_10
- kernel-0:5.14.0-427.13.1.el9_4
- RHSA-2024:2950
- RHSA-2024:3138
- RHSA-2024:2394
Official advisory · high-confidence parse· fetched 9 hours ago·verify at source
Mitigation checklist
- This flaw can be mitigated by explicitly setting the kernel parameter to restrict unprivileged users from using dmesg: ``` sudo sysctl -w kernel.dmesg_restrict=1 ``` To make it persistent between system reboots: ``` echo 'kernel.dmesg_restrict=1' | sudo tee -a /etc/sysctl.conf ```
Official advisory · high-confidence parse· fetched 9 hours ago·verify at source
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