CVE-2025-68745
Description
A flaw was found in the Linux kernel's qla2xxx SCSI driver. This vulnerability occurs when commands sent to the firmware (FW) are not properly cleared after a chip reset. A local attacker could exploit a race condition during direct memory access (DMA) unmapping, leading to a kernel panic. This can result in a system crash and a Denial of Service (DoS).
Statement
A moderate flaw was found in the Linux kernel's qla2xxx SCSI driver, affecting the kernel and kernel-rt components in Red Hat Enterprise Linux 8, 9, and 10. Commands sent to the firmware were not properly cleared after a chip reset, and a race condition between two CPUs concurrently performing DMA unmapping in qlt_unmap_sg() could trigger a kernel BUG_ON, resulting in a kernel panic. A local attacker able to trigger the chip reset and racing DMA unmap paths could exploit this condition to crash the system, causing a denial of service; confidentiality and integrity are not impacted. Red Hat Enterprise Linux 7 Extended Lifecycle Support and Red Hat In-Vehicle OS 1 are not affected because the vulnerable code is not present in those releases. Fixes for the affected Red Hat Enterprise Linux 8, 9, and 10 streams are being pursued by the Red Hat kernel team, and updates have already shipped or are in progress for several streams. Red Hat rates this flaw Moderate severity with a CVSS 4.7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H), which differs significantly from the Critical 9.8 score in the upstream CVE record. The upstream score reflects a network-reachable vector with full confidentiality, integrity, and availability impact that is not supported by the technical evidence: exploitation requires local access and a high-complexity race condition, and only availability is affected.
Mitigation
To mitigate this issue, if the `qla2xxx` SCSI driver is not required, it can be prevented from loading by blacklisting the module. This can be achieved by creating a modprobe configuration file.
1. Create a file named `/etc/modprobe.d/blacklist-qla2xxx.conf` with the following content:
blacklist qla2xxx2. Rebuild the initial ramdisk:
install qla2xxx /bin/true
bash3. Reboot the system for the changes to take effect.
dracut -f -v
This mitigation will prevent the `qla2xxx` module from loading, which may impact systems relying on QLogic Fibre Channel HBAs. A system reboot is required for the changes to take full effect.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 4.7 | N/A | 9.8 |
| Attack Vector | Local | N/A | Network |
| Attack Complexity | High | N/A | Low |
| Privileges Required | Low | N/A | None |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | High |
| Integrity Impact | None | N/A | High |
| Availability Impact | High | N/A | High |
Vector
Red Hat: CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
cve.org: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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