Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: video: fbdev: cirrusfb: check pixclock to avoid divide by zero Do a sanity check on pixclock value to avoid divide by zero. If the pixclock value is zero, the cirrusfb driver will round up pixclock to get the derived frequency as close to maxclock as possible. Syzkaller reported a divide error in cirrusfb_check_pixclock. divide error: 0000 [#1] SMP KASAN PTI CPU: 0 PID: 14938 Comm: cirrusfb_test Not tainted 5.15.0-rc6 #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.0-2 RIP: 0010:cirrusfb_check_var+0x6f1/0x1260 Call Trace: fb_set_var+0x398/0xf90 do_fb_ioctl+0x4b8/0x6f0 fb_ioctl+0xeb/0x130 __x64_sys_ioctl+0x19d/0x220 do_syscall_64+0x3a/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xae
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | < 4.9.311 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/1d3fb46439ad4e8f0c5739eb33d1875ac9e0f135Patch
- https://git.kernel.org/stable/c/40b13e3d85744210db13457785646634e2d056bdPatch
- https://git.kernel.org/stable/c/45800c42ef000f417270bcfc08630e42486fca99Patch
- https://git.kernel.org/stable/c/53a2088a396cfa1da92690a1da289634cd73bf0dPatch
- https://git.kernel.org/stable/c/5c6f402bdcf9e7239c6bc7087eda71ac99b31379Patch
- https://git.kernel.org/stable/c/6fe23ff94e7840097202e85c148688940b37c9b1Patch
- https://git.kernel.org/stable/c/8c7e2141fb89c620ab4e41512e262fbf25b8260dPatch
- https://git.kernel.org/stable/c/c656d04247a2654ede5cead2ecbf83431dad5261Patch
- https://git.kernel.org/stable/c/e498b504f8c81b07efab9febf8503448de4dc9cfPatch
FAQ
What is CVE-2021-47641?
CVE-2021-47641 is a vulnerability with a CVSS score of 5.5 (MEDIUM). In the Linux kernel, the following vulnerability has been resolved: video: fbdev: cirrusfb: check pixclock to avoid divide by zero Do a sanity check on pixclock value to avoid divide by zero. If th...
How severe is CVE-2021-47641?
CVE-2021-47641 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2021-47641?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.