CVE-2022-49070

published 2025-02-26

CVE-2022-49070: In the Linux kernel, the following vulnerability has been resolved: fbdev: Fix unregistering of framebuffers without device OF framebuffers do not have an…

Priority P4 20 medium 5.5 CVSS 3.1

AV L AC L PR L UI N S U C N I N A H

In the Linux kernel, the following vulnerability has been resolved:

fbdev: Fix unregistering of framebuffers without device

OF framebuffers do not have an underlying device in the Linux
device hierarchy. Do a regular unregister call instead of hot
unplugging such a non-existing device. Fixes a NULL dereference.
An example error message on ppc64le is shown below.

BUG: Kernel NULL pointer dereference on read at 0x00000060
Faulting instruction address: 0xc00000000080dfa4
Oops: Kernel access of bad area, sig: 11 [#1]
LE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=2048 NUMA pSeries
[...]
CPU: 2 PID: 139 Comm: systemd-udevd Not tainted 5.17.0-ae085d7f9365 #1
NIP: c00000000080dfa4 LR: c00000000080df9c CTR: c000000000797430
REGS: c000000004132fe0 TRAP: 0300 Not tainted (5.17.0-ae085d7f9365)
MSR: 8000000002009033 CR: 28228282 XER: 20000000
CFAR: c00000000000c80c DAR: 0000000000000060 DSISR: 40000000 IRQMASK: 0
GPR00: c00000000080df9c c000000004133280 c00000000169d200 0000000000000029
GPR04: 00000000ffffefff c000000004132f90 c000000004132f88 0000000000000000
GPR08: c0000000015658f8 c0000000015cd200 c0000000014f57d0 0000000048228283
GPR12: 0000000000000000 c00000003fffe300 0000000020000000 0000000000000000
GPR16: 0000000000000000 0000000113fc4a40 0000000000000005 0000000113fcfb80
GPR20: 000001000f7283b0 0000000000000000 c000000000e4a588 c000000000e4a5b0
GPR24: 0000000000000001 00000000000a0000 c008000000db0168 c0000000021f6ec0
GPR28: c0000000016d65a8 c000000004b36460 0000000000000000 c0000000016d64b0
NIP [c00000000080dfa4] do_remove_conflicting_framebuffers+0x184/0x1d0
[c000000004133280] [c00000000080df9c] do_remove_conflicting_framebuffers+0x17c/0x1d0 (unreliable)
[c000000004133350] [c00000000080e4d0] remove_conflicting_framebuffers+0x60/0x150
[c0000000041333a0] [c00000000080e6f4] remove_conflicting_pci_framebuffers+0x134/0x1b0
[c000000004133450] [c008000000e70438] drm_aperture_remove_conflicting_pci_framebuffers+0x90/0x100 [drm]
[c000000004133490] [c008000000da0ce4] bochs_pci_prob

Affected

14 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 5.17.3-1 (bookworm)	linux 5.17.3-1 (bookworm)
linux	linux	>= 27599aacbaefcbf2af7b06b0029459bbf682000d < 0f525289ff0ddeb380813bd81e0f9bdaaa1c9078	0f525289ff0ddeb380813bd81e0f9bdaaa1c9078
linux	linux	>= 4d695d7c276f15adb1d2b64c584c3cf8f4f9e9ce < feed87ff122b1640c221d4dd559442ab2cd50bb1	feed87ff122b1640c221d4dd559442ab2cd50bb1
linux	linux	>= 5.15.33 < 5.15.34	5.15.34
linux	linux	>= 5.16.19 < 5.16.20	5.16.20
linux	linux	>= 5.17.2 < 5.17.3	5.17.3
linux	linux	>= 9565a3b5203a4d57acbc1d0e981c6df71864b4ab < de33df481545974ba47c46f05194e769e4307843	de33df481545974ba47c46f05194e769e4307843
linux	linux	>= c894ac44786cfed383a6c6b20c1bfb12eb96018a < 2388f826cdc9af2651991adc0feb79de9bdf2232	2388f826cdc9af2651991adc0feb79de9bdf2232
linux	linux_kernel	—	—
linux	linux_kernel	—	—
linux	linux_kernel	—	—
linux	linux_kernel	>= 0 < 5.17.3-1	5.17.3-1
linux	linux_kernel	>= 0 < 5.17.3-1	5.17.3-1
linux	linux_kernel	>= 0 < 5.17.3-1	5.17.3-1

CVSS provenance

nvd v3.1 5.5 MEDIUM CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv 5.5 MEDIUM

vendor_debian 5.5 MEDIUM

vendor_redhat 5.5 MEDIUM

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