CVE-2026-90008
Description
A flaw was found in the Linux kernel's megaraid_sas component. The megasas_make_prp_nvme() function, which constructs a list of memory pages for data transfers, fails to verify the allocated buffer's boundaries. This can result in a buffer overrun, potentially leading to a system crash (Denial of Service) or silent corruption of data belonging to other active commands.
Mitigation
To mitigate this vulnerability, prevent the `megaraid_sas` kernel module from loading if the hardware is not required.
1. Create a configuration file to disable the module:
text
echo "install megaraid_sas /bin/true" > /etc/modprobe.d/megaraid_sas.conf
echo "blacklist megaraid_sas" >> /etc/modprobe.d/megaraid_sas.conf
2. If the module is already loaded into memory, unload it:
text
modprobe -r megaraid_sas
Caveats:
- Disabling this driver prevents communication with MegaRAID SAS controllers. Do not apply this configuration if the host utilizes these controllers for essential storage or root filesystems, as it will make disks inaccessible and prevent booting.
- If the module is loaded during early boot via the initial ramdisk, rebuild the initramfs with `dracut -f`.
- A system restart is required for changes to take full effect if the driver cannot be unloaded while in use.
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).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 7 | N/A | 7.8 |
| Attack Vector | Local | N/A | Local |
| Attack Complexity | High | N/A | Low |
| Privileges Required | Low | N/A | Low |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | High | N/A | High |
| Integrity Impact | High | 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:H/I:H/A:H
cve.org: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Understanding the Weakness (CWE)
Integrity
Technical Impact: Modify Memory; Execute Unauthorized Code or Commands
Write operations could cause memory corruption. In some cases, an adversary can modify control data such as return addresses in order to execute unexpected code.
Availability
Technical Impact: DoS: Crash, Exit, or Restart
Attempting to access out-of-range, invalid, or unauthorized memory could cause the product to crash.
Other
Technical Impact: Unexpected State
Subsequent write operations can produce undefined or unexpected results.
Frequently Asked Questions
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