In the Linux kernel, the following vulnerability has been resolved:
media: cx88: Fix a null-ptr-deref bug in buffer_prepare()
When the driver calls cx88_risc_buffer() to prepare the buffer, the function call may fail, resulting in a empty buffer and null-ptr-deref later in buffer_queue().
The following log can reveal it:
[ 41.822762] general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI [ 41.824488] KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] [ 41.828027] RIP: 0010:buffer_queue+0xc2/0x500 [ 41.836311] Call Trace: [ 41.836945] __enqueue_in_driver+0x141/0x360 [ 41.837262] vb2_start_streaming+0x62/0x4a0 [ 41.838216] vb2_core_streamon+0x1da/0x2c0 [ 41.838516] __vb2_init_fileio+0x981/0xbc0 [ 41.839141] __vb2_perform_fileio+0xbf9/0x1120 [ 41.840072] vb2_fop_read+0x20e/0x400 [ 41.840346] v4l2_read+0x215/0x290 [ 41.840603] vfs_read+0x162/0x4c0
Fix this by checking the return value of cx88_risc_buffer()
[hverkuil: fix coding style issues]
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Sep 19, 2025 | Sep 19, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade kernelUpgrade kernel-tools-libsUpgrade bpftoolUpgrade kernel-abi-stablelistsUpgrade python3-perfUpgrade kernel-tools | Feb 3, 2026 | Feb 2, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Sep 17, 2025 |
| Ubuntu | — | Upgrade linux-gkeopUpgrade linux-awsUpgrade linux-oracle-5.15Upgrade linux-hwe-5.4Upgrade linux-aws-fipsUpgrade linux-gcpUpgrade linux-oracle-5.4Upgrade linux-gcp-fipsUpgrade linux-azure-fde-5.15Upgrade linux-fipsUpgrade linux-azure-fipsUpgrade linux-ibm-5.4Upgrade linux-riscv-5.15Upgrade linux-gcp-5.4Upgrade linux-gkeUpgrade linuxUpgrade linux-aws-5.4Upgrade linux-oracleUpgrade linux-azure-5.15Upgrade linux-gcp-5.15Upgrade linux-iotUpgrade linux-realtimeUpgrade linux-ibmUpgrade linux-nvidiaUpgrade linux-hwe-5.15Upgrade linux-aws-hweUpgrade linux-aws-5.15Upgrade linux-xilinx-zynqmpUpgrade linux-lowlatency-hwe-5.15Upgrade linux-gcp-4.15Upgrade linux-azure-4.15Upgrade linux-raspiUpgrade linux-intel-iotg-5.15Upgrade linux-azureUpgrade linux-bluefieldUpgrade linux-raspi-5.4Upgrade linux-azure-5.4Upgrade linux-kvmUpgrade linux-intel-iotgUpgrade linux-hweUpgrade linux-lowlatency | Sep 26, 2025 | Sep 17, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 15, 2025 | Sep 17, 2025 |
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