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CVE-2022-49004

riscv: Sync efi page table's kernel mappings before switching

Medium5.5EPSS 0.24%
Published
Updated
Reserved
Assigned by
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: riscv: Sync efi page table's kernel mappings before switching The EFI page table is initially created as a copy of the kernel page table. With VMAP_STACK enabled, kernel stacks are allocated in the vmalloc area: if the stack is allocated in a new PGD (one that was not present at the moment of the efi page table creation or not synced in a previous vmalloc fault), the kernel will take a trap when switching to the efi page table when the vmalloc kernel stack is accessed, resulting in a kernel panic. Fix that by updating the efi kernel mappings before switching to the efi page table.

Scores

CVSS scores of CVE-2022-49004, by who scored it
Scored byCVSSScoreVector
NVDNVD · Analyzed3.1Medium5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.24% · top 84% of all CVEs (7 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.

Affected products

  • Linux · Linux

    • affected b91540d52a08b65eb6a2b09132e1bd54fa82754c – < fa7a7d185ef380546b4b1fed6f84f31dbae8cec7
    • affected b91540d52a08b65eb6a2b09132e1bd54fa82754c – < 96f479383d92944406d4b3f2bc03c2f640def9f1
    • affected b91540d52a08b65eb6a2b09132e1bd54fa82754c – < 3f105a742725a1b78766a55169f1d827732e62b8

  • Linux · Linux

    • affected 5.10
    • unaffected < 5.10
    • unaffected 5.15.82 – ≤ 5.15.*
    • unaffected 6.0.12 – ≤ 6.0.*
    • unaffected 6.1 – ≤ *

References (3)

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .