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
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Linux | Linux | 2.6.12 | 4.9.311 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | linux | 5.17.3-1 | — |
| Debian 13 | linux | 5.17.3-1 | — |
| Debian 12 | linux | 5.17.3-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux-raspi-realtime | No fix yet | — |
| Ubuntu 22.04 LTS | linux +1 | 5.15.0-37.39 | — |
| Ubuntu 22.04 LTS | linux-aws | 5.15.0-1011.14 | — |
| Ubuntu 22.04 LTS | linux-azure | 5.15.0-1010.12 | — |
| Ubuntu 22.04 LTS | linux-gcp | 5.15.0-1008.12 | — |
| Ubuntu 22.04 LTS | linux-gke | 5.15.0-1008.10 | — |
| Ubuntu 22.04 LTS | linux-ibm | 5.15.0-1007.8 | — |
| Ubuntu 22.04 LTS | linux-intel-iotg | 5.15.0-1008.11 | — |
| Ubuntu 22.04 LTS | linux-kvm | 5.15.0-1010.11 | — |
| Ubuntu 22.04 LTS | linux-oracle | 5.15.0-1009.12 | — |
| Ubuntu 22.04 LTS | linux-raspi | 5.15.0-1011.13 | — |
| Ubuntu 22.04 LTS | linux-riscv +32 | No fix yet | — |
| Ubuntu 20.04 LTS | linux | 5.4.0-117.132 | — |
| Ubuntu 20.04 LTS | linux-aws +1 | 5.4.0-1078.84 | — |
| Ubuntu 20.04 LTS | linux-azure | 5.4.0-1083.87 | — |
| Ubuntu 20.04 LTS | linux-azure-5.15 | 5.15.0-1008.9~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-bluefield | 5.4.0-1040.44 | — |
| Ubuntu 20.04 LTS | linux-gke +28 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-hwe-5.15 | 5.15.0-41.44~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-ibm | 5.4.0-1026.29 | — |
| Ubuntu 20.04 LTS | linux-intel-iotg-5.15 | 5.15.0-1008.11~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-iot | 5.4.0-1004.6 | — |
| Ubuntu 20.04 LTS | linux-kvm | 5.4.0-1068.72 | — |
| Ubuntu 20.04 LTS | linux-lowlatency-hwe-5.15 | 5.15.0-42.45~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-oracle | 5.4.0-1076.83 | — |
| Ubuntu 20.04 LTS | linux-raspi | 5.4.0-1065.75 | — |
| Ubuntu 18.04 LTS | linux | 4.15.0-189.200 | — |
| Ubuntu 18.04 LTS | linux-aws | 4.15.0-1137.148 | — |
| Ubuntu 18.04 LTS | linux-aws-5.4 +1 | 5.4.0-1078.84~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-azure-4.15 | 4.15.0-1146.161 | — |
| Ubuntu 18.04 LTS | linux-azure-5.4 | 5.4.0-1083.87~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-gcp +14 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp-4.15 | 4.15.0-1131.147 | — |
| Ubuntu 18.04 LTS | linux-hwe-5.4 | 5.4.0-117.132~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-ibm-5.4 | 5.4.0-1028.32~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-kvm | 4.15.0-1123.128 | — |
| Ubuntu 18.04 LTS | linux-oracle | 4.15.0-1102.113 | — |
| Ubuntu 18.04 LTS | linux-oracle-5.4 | 5.4.0-1076.83~18.04.1 | — |
| Ubuntu 18.04 LTS | linux-raspi-5.4 | 5.4.0-1065.75~18.04.1 | — |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro Realtime 22.04 LTS | linux-realtime | 5.15.0-1014.14 | — |
| Ubuntu Pro FIPS 20.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS 18.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS 16.04 LTS | linux-fips | No fix yet | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-aws-fips +1 | 5.4.0-1078.84+fips1 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-azure-fips | 5.4.0-1083.87+fips1 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-fips | 5.4.0-1054.61 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-aws-fips | 4.15.0-2076.81 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-azure-fips | 4.15.0-2057.63 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-fips | 4.15.0-1094.105 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-gcp-fips | 4.15.0-2041.46 | — |
| Ubuntu Pro FIPS-updates 16.04 LTS | linux-fips | No fix yet | — |
| Ubuntu Pro 16.04 LTS | linux +2 | No fix yet | — |
| Ubuntu Pro 16.04 LTS | linux-aws-hwe | 4.15.0-1137.148~16.04.1 | — |
| Ubuntu Pro 16.04 LTS | linux-azure | 4.15.0-1146.161~16.04.1 | — |
| Ubuntu Pro 16.04 LTS | linux-gcp | 4.15.0-1131.147~16.04.1 | — |
| Ubuntu Pro 16.04 LTS | linux-hwe | 4.15.0-189.200~16.04.1 | — |
| Ubuntu Pro 16.04 LTS | linux-oracle | 4.15.0-1102.113~16.04.1 | — |
| Ubuntu Pro 14.04 LTS | linux +2 | No fix yet | — |
| Ubuntu Pro 14.04 LTS | linux-azure | 4.15.0-1146.161~14.04.1 | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP5 | kernel-64kb +6 | 5.14.21-150500.55.100.1 | SUSE-SU-2025:1241-1 |
| SLES 15 SP5 | kernel-default-base | 5.14.21-150500.55.100.1.150500.6.47.1 | SUSE-SU-2025:1241-1 |
| SLES 15 SP4 | kernel-64kb +6 | 5.14.21-150400.24.158.1 | SUSE-SU-2025:1027-1 |
| SLES 15 SP4 | kernel-default-base | 5.14.21-150400.24.158.1.150400.24.78.1 | SUSE-SU-2025:1027-1 |
| SLES 15 SP3 | kernel-64kb +7 | 5.3.18-150300.59.201.1 | SUSE-SU-2025:1263-1 |
| SLES 15 SP3 | kernel-default-base | 5.3.18-150300.59.201.1.150300.18.120.1 | SUSE-SU-2025:1263-1 |
Show 17 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP5 | kernel-default-base | 5.14.21-150500.55.100.1.150500.6.47.1 | SUSE-SU-2025:1241-1 |
| SLES for SAP 15 SP5 | kernel-docs +4 | 5.14.21-150500.55.100.1 | SUSE-SU-2025:1241-1 |
| SLES for SAP 15 SP4 | kernel-default-base | 5.14.21-150400.24.158.1.150400.24.78.1 | SUSE-SU-2025:1027-1 |
| SLES for SAP 15 SP4 | kernel-docs +4 | 5.14.21-150400.24.158.1 | SUSE-SU-2025:1027-1 |
| SLES for SAP 15 SP3 | kernel-default-base | 5.3.18-150300.59.201.1.150300.18.120.1 | SUSE-SU-2025:1263-1 |
| SLES for SAP 15 SP3 | kernel-docs +5 | 5.3.18-150300.59.201.1 | SUSE-SU-2025:1263-1 |
| SLE Micro 5.5 | kernel-default-base | 5.14.21-150500.55.100.1.150500.6.47.1 | SUSE-SU-2025:1241-1 |
| SLE Micro 5.5 | kernel-rt +1 | 5.14.21-150500.13.91.1 | SUSE-SU-2025:1176-1 |
| SLE Micro 5.5 | kernel-source +1 | 5.14.21-150500.55.100.1 | SUSE-SU-2025:1241-1 |
| SLE Micro 5.4 | kernel-default | 5.14.21-150400.24.158.1 | SUSE-SU-2025:1027-1 |
| SLE Micro 5.4 | kernel-default-base | 5.14.21-150400.24.158.1.150400.24.78.1 | SUSE-SU-2025:1027-1 |
| SLE Micro 5.4 | kernel-rt +1 | 5.14.21-150400.15.115.1 | SUSE-SU-2025:1183-1 |
| SLE Micro 5.3 | kernel-default | 5.14.21-150400.24.158.1 | SUSE-SU-2025:1027-1 |
| SLE Micro 5.3 | kernel-default-base | 5.14.21-150400.24.158.1.150400.24.78.1 | SUSE-SU-2025:1027-1 |
| SLE Micro 5.3 | kernel-rt +1 | 5.14.21-150400.15.115.1 | SUSE-SU-2025:1183-1 |
| SLE Micro 5.2 | kernel-default | 5.3.18-150300.59.201.1 | SUSE-SU-2025:1263-1 |
| SLE Micro 5.2 | kernel-default-base | 5.3.18-150300.59.201.1.150300.18.120.1 | SUSE-SU-2025:1263-1 |
| SLE Micro 5.2 | kernel-rt +1 | 5.3.18-150300.205.1 | SUSE-SU-2025:1194-1 |
| SLE Micro 5.1 | kernel-default | 5.3.18-150300.59.201.1 | SUSE-SU-2025:1263-1 |
| SLE Micro 5.1 | kernel-default-base | 5.3.18-150300.59.201.1.150300.18.120.1 | SUSE-SU-2025:1263-1 |
| SLE Micro 5.1 | kernel-rt +1 | 5.3.18-150300.205.1 | SUSE-SU-2025:1194-1 |
| SLE Live Patching 15 SP5 | kernel-default | 5.14.21-150500.55.100.1 | SUSE-SU-2025:1241-1 |
| SLE Live Patching 15 SP5 | kernel-livepatch-SLE15-SP5_Update_25 | 1-150500.11.3.1 | SUSE-SU-2025:1241-1 |
| SLE Live Patching 15 SP4 | kernel-default | 5.14.21-150400.24.158.1 | SUSE-SU-2025:1027-1 |
| SLE Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_38 | 1-150400.9.3.1 | SUSE-SU-2025:1027-1 |
| SLE Live Patching 15 SP3 | kernel-default | 5.3.18-150300.59.201.1 | SUSE-SU-2025:1263-1 |
| SLE Live Patching 15 SP3 | kernel-livepatch-SLE15-SP3_Update_56 | 1-150300.7.3.1 | SUSE-SU-2025:1263-1 |
| SLE HPC 15 SP5 | kernel-64kb +5 | 5.14.21-150500.55.100.1 | SUSE-SU-2025:1241-1 |
| SLE HPC 15 SP5 | kernel-default-base | 5.14.21-150500.55.100.1.150500.6.47.1 | SUSE-SU-2025:1241-1 |
| SLE HPC 15 SP4 | kernel-64kb +5 | 5.14.21-150400.24.158.1 | SUSE-SU-2025:1027-1 |
| SLE HPC 15 SP4 | kernel-default-base | 5.14.21-150400.24.158.1.150400.24.78.1 | SUSE-SU-2025:1027-1 |
| SLE HPC 15 SP3 | kernel-64kb +6 | 5.3.18-150300.59.201.1 | SUSE-SU-2025:1263-1 |
| SLE HPC 15 SP3 | kernel-default-base | 5.3.18-150300.59.201.1.150300.18.120.1 | SUSE-SU-2025:1263-1 |
| SUSE Manager Server 4.3 | kernel-default-base | 5.14.21-150400.24.158.1.150400.24.78.1 | SUSE-SU-2025:1027-1 |
| SUSE Manager Server 4.3 | kernel-syms +3 | 5.14.21-150400.24.158.1 | SUSE-SU-2025:1027-1 |
| SUSE Manager Proxy 4.3 | kernel-default-base | 5.14.21-150400.24.158.1.150400.24.78.1 | SUSE-SU-2025:1027-1 |
| SUSE Manager Proxy 4.3 | kernel-syms +2 | 5.14.21-150400.24.158.1 | SUSE-SU-2025:1027-1 |
| SUSE Enterprise Storage 7.1 | kernel-64kb +6 | 5.3.18-150300.59.201.1 | SUSE-SU-2025:1263-1 |
| SUSE Enterprise Storage 7.1 | kernel-default-base | 5.3.18-150300.59.201.1.150300.18.120.1 | SUSE-SU-2025:1263-1 |
Advisories 6
- SUSE-SU-2025:1194-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:1176-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:1241-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:1027-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:1183-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:1263-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Apr 16, 2025
References
- https://git.kernel.org/stable/c/c656d04247a2654ede5cead2ecbf83431dad5261
- https://git.kernel.org/stable/c/1d3fb46439ad4e8f0c5739eb33d1875ac9e0f135
- https://git.kernel.org/stable/c/40b13e3d85744210db13457785646634e2d056bd
- https://git.kernel.org/stable/c/53a2088a396cfa1da92690a1da289634cd73bf0d
- https://git.kernel.org/stable/c/8c7e2141fb89c620ab4e41512e262fbf25b8260d
- https://git.kernel.org/stable/c/6fe23ff94e7840097202e85c148688940b37c9b1
- https://git.kernel.org/stable/c/45800c42ef000f417270bcfc08630e42486fca99
- https://git.kernel.org/stable/c/e498b504f8c81b07efab9febf8503448de4dc9cf
- https://git.kernel.org/stable/c/5c6f402bdcf9e7239c6bc7087eda71ac99b31379