cbcvebase.
CVE-2021-47641
published 2025-02-26

CVE-2021-47641: 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…

PriorityP419medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.25%
16.4th percentile
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

Affected

23 ranges
VendorProductVersion rangeFixed in
debianlinux< linux 5.17.3-1 (bookworm)linux 5.17.3-1 (bookworm)
linuxlinux——
linuxlinux>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < c656d04247a2654ede5cead2ecbf83431dad5261c656d04247a2654ede5cead2ecbf83431dad5261
linuxlinux>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 1d3fb46439ad4e8f0c5739eb33d1875ac9e0f1351d3fb46439ad4e8f0c5739eb33d1875ac9e0f135
linuxlinux>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 40b13e3d85744210db13457785646634e2d056bd40b13e3d85744210db13457785646634e2d056bd
linuxlinux>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 53a2088a396cfa1da92690a1da289634cd73bf0d53a2088a396cfa1da92690a1da289634cd73bf0d
linuxlinux>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 8c7e2141fb89c620ab4e41512e262fbf25b8260d8c7e2141fb89c620ab4e41512e262fbf25b8260d
linuxlinux>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 6fe23ff94e7840097202e85c148688940b37c9b16fe23ff94e7840097202e85c148688940b37c9b1
linuxlinux>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 45800c42ef000f417270bcfc08630e42486fca9945800c42ef000f417270bcfc08630e42486fca99
linuxlinux>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < e498b504f8c81b07efab9febf8503448de4dc9cfe498b504f8c81b07efab9febf8503448de4dc9cf
linuxlinux>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 5c6f402bdcf9e7239c6bc7087eda71ac99b313795c6f402bdcf9e7239c6bc7087eda71ac99b31379
linuxlinux_kernel< 4.9.3114.9.311
linuxlinux_kernel>= 0 < 5.10.113-15.10.113-1
linuxlinux_kernel>= 0 < 5.17.3-15.17.3-1
linuxlinux_kernel>= 0 < 5.17.3-15.17.3-1
linuxlinux_kernel>= 0 < 5.17.3-15.17.3-1
linuxlinux_kernel>= 4.10 < 4.14.2764.14.276
linuxlinux_kernel>= 4.15 < 4.19.2384.19.238
linuxlinux_kernel>= 4.20 < 5.4.1895.4.189
linuxlinux_kernel>= 5.11 < 5.15.335.15.33
linuxlinux_kernel>= 5.16 < 5.16.195.16.19
linuxlinux_kernel>= 5.17 < 5.17.25.17.2
linuxlinux_kernel>= 5.5 < 5.10.1105.10.110

CVSS provenance

nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv5.5MEDIUM
vendor_debian5.5MEDIUM
vendor_redhat5.5MEDIUM
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