CVE-2026-90008 is a vulnerability in Linux Kernel
Published on September 16, 2026
scsi: megaraid_sas: Limit NVMe request size to the PRP chain frame
In the Linux kernel, the following vulnerability has been resolved:
scsi: megaraid_sas: Limit NVMe request size to the PRP chain frame
megasas_make_prp_nvme() builds a command's PRP list in cmd->sg_frame, a
DMA pool buffer of instance->max_chain_frame_sz bytes, spending one
entry per NVMe page of the transfer plus one per page of the buffer for
the chain pointer. The loop runs until the transfer is described and
never checks the buffer bound.
max_hw_sectors comes straight from the MDTS the firmware reports for the
drive. On drives with a large MDTS the only thing keeping the list
inside the buffer was the block layer default of 1280 KiB, which needs
320 entries, which fit into a 4 KiB frame as that holds 512. But since
commit 9b8b84879d4a ("block: Increase BLK_DEF_MAX_SECTORS_CAP") that
default is 4 MiB, and such a transfer needs 1025 entries, so the list
runs a full page past the end of the frame:
sd 1:0:1:0: [sdb] tag#630 page boundary ptr_sgl: 0x00000000ba62d13f
BUG: unable to handle page fault for address: ff663bcb81e7c000
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
RIP: 0010:megasas_build_and_issue_cmd_fusion+0xeaa/0x1870 [megaraid_sas]
If the page after the frame happens to be mapped, the overrun does not
fault but silently corrupts the neighbouring pool entry, which is
another in-flight command's PRP list.
Cap max_hw_sectors at what the chain frame can describe, less one page
for transfers that do not start on a page boundary and so need one entry
more. This is the megaraid_sas counterpart of commit 04631f55afc5
("scsi: mpt3sas: Limit NVMe request size to 2 MiB"), but derives the
limit from max_chain_frame_sz rather than hardcoding it.
Products Associated with CVE-2026-90008
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Affected Versions
Linux:- Version 9b8b84879d4adc506b0d3944e20b28d9f3f6994b and below 4bb34769ef44ab3770b89e4055de6af4a458bec9 is affected.
- Version 9b8b84879d4adc506b0d3944e20b28d9f3f6994b and below 4dd118d06dec9efe5065ac7897bdc18f404a3af4 is affected.
- Version 9b8b84879d4adc506b0d3944e20b28d9f3f6994b and below af8c27375733fb6a6df9fa484cda77cc3dd0cb80 is affected.
- Version 6.17 is affected.
- Before 6.17 is unaffected.
- Version 6.18.51, <= 6.18.* is unaffected.
- Version 7.2.5, <= 7.2.* is unaffected.
- Version 7.3-rc2, <= * is unaffected.