CVE-2024-42276

nvme-pci in linux kernel does not call nvme_unmap_data for the same instances of nvme_map_data, which can lead to incorrect dereferencing.

A moderate-impact flaw was found in the Linux kernel NVMe PCI driver (nvme-pci) as shipped in Red Hat Enterprise Linux 9 and Fedora. nvme_map_data() is only called when a request has physical segments, but nvme_unmap_data() was invoked without the same condition check, so it could run for a request for which no data had ever been mapped. This results in an incorrect pointer dereference in the kernel that can at most cause a system crash or denial of service. Red Hat rates this flaw Moderate (CVSS 4.4, CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H) because triggering the vulnerable path requires local access with high privileges and the issue has no confidentiality or integrity impact; this is lower than the severity recorded in the upstream CVE record. Red Hat Enterprise Linux 6 and 8 and the hosted OpenShift (ARO and OSD) clusters are not affected by this flaw, and Red Hat Enterprise Linux 7 is out of support. Fixes for the affected Red Hat Enterprise Linux 9 kernel and kernel-rt packages are being pursued by the Red Hat kernel engineering team as part of the delegated resolution.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.