CVE-2021-47228
published 2024-05-21CVE-2021-47228: In the Linux kernel, the following vulnerability has been resolved: x86/ioremap: Map EFI-reserved memory as encrypted for SEV Some drivers require memory that…
PriorityP422medium6.2CVSS 3.1
AVLACLPRNUINSUCNINAH
EPSS
0.24%
14.8th percentile
In the Linux kernel, the following vulnerability has been resolved:
x86/ioremap: Map EFI-reserved memory as encrypted for SEV
Some drivers require memory that is marked as EFI boot services
data. In order for this memory to not be re-used by the kernel
after ExitBootServices(), efi_mem_reserve() is used to preserve it
by inserting a new EFI memory descriptor and marking it with the
EFI_MEMORY_RUNTIME attribute.
Under SEV, memory marked with the EFI_MEMORY_RUNTIME attribute needs to
be mapped encrypted by Linux, otherwise the kernel might crash at boot
like below:
EFI Variables Facility v0.08 2004-May-17
general protection fault, probably for non-canonical address 0x3597688770a868b2: 0000 [#1] SMP NOPTI
CPU: 13 PID: 1 Comm: swapper/0 Not tainted 5.12.4-2-default #1 openSUSE Tumbleweed
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015
RIP: 0010:efi_mokvar_entry_next
[...]
Call Trace:
efi_mokvar_sysfs_init
? efi_mokvar_table_init
do_one_initcall
? __kmalloc
kernel_init_freeable
? rest_init
kernel_init
ret_from_fork
Expand the __ioremap_check_other() function to additionally check for
this other type of boot data reserved at runtime and indicate that it
should be mapped encrypted for an SEV guest.
[ bp: Massage commit message. ]
Affected
12 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | linux | < linux 5.10.46-1 (bookworm) | linux 5.10.46-1 (bookworm) |
| linux | linux | — | — |
| linux | linux | >= 58c909022a5a56cd1d9e89c8c5461fd1f6a27bb5 < 208bb686e7fa7fff16e8fa78ff0db34aa9acdbd7 | 208bb686e7fa7fff16e8fa78ff0db34aa9acdbd7 |
| linux | linux | >= 58c909022a5a56cd1d9e89c8c5461fd1f6a27bb5 < b7a05aba39f733ec337c5b952e112dd2dc4fc404 | b7a05aba39f733ec337c5b952e112dd2dc4fc404 |
| linux | linux | >= 58c909022a5a56cd1d9e89c8c5461fd1f6a27bb5 < 8d651ee9c71bb12fc0c8eb2786b66cbe5aa3e43b | 8d651ee9c71bb12fc0c8eb2786b66cbe5aa3e43b |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 0 < 5.10.46-1 | 5.10.46-1 |
| linux | linux_kernel | >= 0 < 5.10.46-1 | 5.10.46-1 |
| linux | linux_kernel | >= 0 < 5.10.46-1 | 5.10.46-1 |
| linux | linux_kernel | >= 0 < 5.10.46-1 | 5.10.46-1 |
| linux | linux_kernel | >= 5.10 < 5.10.46 | 5.10.46 |
| linux | linux_kernel | >= 5.11 < 5.12.13 | 5.12.13 |
CVSS provenance
nvdv3.16.2MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
osv6.2MEDIUM
vendor_debian6.2MEDIUM
vendor_redhat6.2MEDIUM
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
Red Hat
kernel: x86/ioremap: Map EFI-reserved memory as encrypted for SEV
vendor_redhat·2024-05-21·CVSS 6.2
CVE-2021-47228 [MEDIUM] CWE-99 kernel: x86/ioremap: Map EFI-reserved memory as encrypted for SEV
kernel: x86/ioremap: Map EFI-reserved memory as encrypted for SEV
In the Linux kernel, the following vulnerability has been resolved:
x86/ioremap: Map EFI-reserved memory as encrypted for SEV
Some drivers require memory that is marked as EFI boot services
data. In order for this memory to not be re-used by the kernel
after ExitBootServices(), efi_mem_reserve() is used to preserve it
by inserting a new EFI memory descriptor and marking it with the
EFI_MEMORY_RUNTIME attribute.
Under SEV, memory marked with the EFI_MEMORY_RUNTIME attribute needs to
be mapped encrypted by Linux, otherwise the kernel might crash at boot
like below:
EFI Variables Facility v0.08 2004-May-17
general protection fault, probably for non-canonical address 0x3597688770a868b2: 0000 [#1] SMP NOPTI
CPU: 13 PID: 1 Comm:
Debian
CVE-2021-47228: linux - In the Linux kernel, the following vulnerability has been resolved: x86/ioremap...
vendor_debian·2021·CVSS 6.2
CVE-2021-47228 [MEDIUM] CVE-2021-47228: linux - In the Linux kernel, the following vulnerability has been resolved: x86/ioremap...
In the Linux kernel, the following vulnerability has been resolved: x86/ioremap: Map EFI-reserved memory as encrypted for SEV Some drivers require memory that is marked as EFI boot services data. In order for this memory to not be re-used by the kernel after ExitBootServices(), efi_mem_reserve() is used to preserve it by inserting a new EFI memory descriptor and marking it with the EFI_MEMORY_RUNTIME attribute. Under SEV, memory marked with the EFI_MEMORY_RUNTIME attribute needs to be mapped encrypted by Linux, otherwise the kernel might crash at boot like below: EFI Variables Facility v0.08 2004-May-17 general protection fault, probably for non-canonical address 0x3597688770a868b2: 0000 [#1] SMP NOPTI CPU: 13 PID: 1 Comm: swapper/0 Not tainted 5.12.4-2-default #1 openSUSE Tumbleweed Hardw
GHSA
GHSA-w5h9-gvgr-jhpg: In the Linux kernel, the following vulnerability has been resolved:
x86/ioremap: Map EFI-reserved memory as encrypted for SEV
Some drivers require m
ghsa_unreviewed·2024-05-21
CVE-2021-47228 [MEDIUM] GHSA-w5h9-gvgr-jhpg: In the Linux kernel, the following vulnerability has been resolved:
x86/ioremap: Map EFI-reserved memory as encrypted for SEV
Some drivers require m
In the Linux kernel, the following vulnerability has been resolved:
x86/ioremap: Map EFI-reserved memory as encrypted for SEV
Some drivers require memory that is marked as EFI boot services
data. In order for this memory to not be re-used by the kernel
after ExitBootServices(), efi_mem_reserve() is used to preserve it
by inserting a new EFI memory descriptor and marking it with the
EFI_MEMORY_RUNTIME attribute.
Under SEV, memory marked with the EFI_MEMORY_RUNTIME attribute needs to
be mapped encrypted by Linux, otherwise the kernel might crash at boot
like below:
EFI Variables Facility v0.08 2004-May-17
general protection fault, probably for non-canonical address 0x3597688770a868b2: 0000 [#1] SMP NOPTI
CPU: 13 PID: 1 Comm: swapper/0 Not tainted 5.12.4-2-default #1 openSUSE Tumbleweed
H
OSV
CVE-2021-47228: In the Linux kernel, the following vulnerability has been resolved: x86/ioremap: Map EFI-reserved memory as encrypted for SEV Some drivers require mem
osv·2024-05-21·CVSS 6.2
CVE-2021-47228 [MEDIUM] CVE-2021-47228: In the Linux kernel, the following vulnerability has been resolved: x86/ioremap: Map EFI-reserved memory as encrypted for SEV Some drivers require mem
In the Linux kernel, the following vulnerability has been resolved: x86/ioremap: Map EFI-reserved memory as encrypted for SEV Some drivers require memory that is marked as EFI boot services data. In order for this memory to not be re-used by the kernel after ExitBootServices(), efi_mem_reserve() is used to preserve it by inserting a new EFI memory descriptor and marking it with the EFI_MEMORY_RUNTIME attribute. Under SEV, memory marked with the EFI_MEMORY_RUNTIME attribute needs to be mapped encrypted by Linux, otherwise the kernel might crash at boot like below: EFI Variables Facility v0.08 2004-May-17 general protection fault, probably for non-canonical address 0x3597688770a868b2: 0000 [#1] SMP NOPTI CPU: 13 PID: 1 Comm: swapper/0 Not tainted 5.12.4-2-default #1 openSUSE Tumbleweed Hardw
No detection rules found.
No public exploits indexed.
https://git.kernel.org/stable/c/208bb686e7fa7fff16e8fa78ff0db34aa9acdbd7https://git.kernel.org/stable/c/8d651ee9c71bb12fc0c8eb2786b66cbe5aa3e43bhttps://git.kernel.org/stable/c/b7a05aba39f733ec337c5b952e112dd2dc4fc404https://git.kernel.org/stable/c/208bb686e7fa7fff16e8fa78ff0db34aa9acdbd7https://git.kernel.org/stable/c/8d651ee9c71bb12fc0c8eb2786b66cbe5aa3e43bhttps://git.kernel.org/stable/c/b7a05aba39f733ec337c5b952e112dd2dc4fc404
2024-05-21
Published