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CVE-2022-49162: video: fbdev: sm712fb: Fix crash in smtcfb_write()

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-02-26 · updated 2026-08-04

Description

In the Linux kernel, the following vulnerability has been resolved: video: fbdev: sm712fb: Fix crash in smtcfb_write() When the sm712fb driver writes three bytes to the framebuffer, the driver will crash: BUG: unable to handle page fault for address: ffffc90001ffffff RIP: 0010:smtcfb_write+0x454/0x5b0 Call Trace: vfs_write+0x291/0xd60 ? do_sys_openat2+0x27d/0x350 ? __fget_light+0x54/0x340 ksys_write+0xce/0x190 do_syscall_64+0x43/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae Fix it by removing the open-coded endianness fixup-code.

Affected products

• Linux kernel: before 4.9.311; from 4.10 before 4.14.276; from 4.15 before 4.19.238; from 4.20 before 5.4.189; from 5.5 before 5.10.110; from 5.11 before 5.15.33 — fixed in 4.14.276, 4.19.238, 4.9.311, 5.10.110, 5.15.33, 5.16.19

How to fix

Upgrade to a fixed version: Linux kernel 4.14.276, 4.19.238, 4.9.311, 5.10.110. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0ec746674296c94137f074309c26d17e644c0498
• https://git.kernel.org/stable/c/1aea36a62f0a0ad67eccc945bac0bd6422ef720f
• https://git.kernel.org/stable/c/3b36c05f68ba32d0dfb63abc9016d6fe9117829f
• https://git.kernel.org/stable/c/4f01d09b2bbfbcb47b3eb305560a7f4857a32260
• https://git.kernel.org/stable/c/809b8cde86320698661eec677222bc5c5df76176
• https://git.kernel.org/stable/c/aeb635b49530b7d19e140949753409f759ba99be
• https://git.kernel.org/stable/c/b1c28577529cdfad40c8242673285f1e1e4c314e
• https://git.kernel.org/stable/c/eae90015d10f0c9a47fc4adccba4cd79dce664e4
• https://git.kernel.org/stable/c/fb791514acf9070225eed46e1ccbb0aa7aae5da5

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