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In the Linux kernel, the following vulnerability has been resolved:
media: vidtv: Fix use-after-free in vidtv_bridge_dvb_init()
KASAN reports a use-after-free: BUG: KASAN: use-after-free in dvb_dmxdev_release+0x4d5/0x5d0 [dvb_core] Call Trace: ... dvb_dmxdev_release+0x4d5/0x5d0 [dvb_core] vidtv_bridge_probe+0x7bf/0xa40 [dvb_vidtv_bridge] platform_probe+0xb6/0x170 ... Allocated by task 1238: ... dvb_register_device+0x1a7/0xa70 [dvb_core] dvb_dmxdev_init+0x2af/0x4a0 [dvb_core] vidtv_bridge_probe+0x766/0xa40 [dvb_vidtv_bridge] ... Freed by task 1238: dvb_register_device+0x6d2/0xa70 [dvb_core] dvb_dmxdev_init+0x2af/0x4a0 [dvb_core] vidtv_bridge_probe+0x766/0xa40 [dvb_vidtv_bridge] ...
It is because the error handling in vidtv_bridge_dvb_init() is wrong.
First, vidtv_bridge_dmx(dev)_init() will clean themselves when fail, but goto fail_dmx(_dev): calls release functions again, which causes use-after-free.
Also, in fail_fe, fail_tuner_probe and fail_demod_probe, j = i will cause out-of-bound when i finished its loop (i == NUM_FE). And the loop releasing is wrong, although now NUM_FE is 1 so it won't cause problem.
Fix this by correctly releasing everything.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Dec 29, 2025 | Dec 29, 2025 |
| Ubuntu | — | Upgrade linuxUpgrade linux-aws-5.15Upgrade linux-lowlatency-hwe-5.15Upgrade linux-azureUpgrade linux-azure-fdeUpgrade linux-nvidia-tegra-5.15Upgrade linux-gcpUpgrade linux-hwe-5.15Upgrade linux-bluefieldUpgrade linux-awsUpgrade linux-intel-iot-realtimeUpgrade linux-gcp-5.15Upgrade linux-ibmUpgrade linux-oracle-5.15Upgrade linux-intel-iotgUpgrade linux-riscv-5.15Upgrade linux-realtimeUpgrade linux-gkeUpgrade linux-raspiUpgrade linux-nvidiaUpgrade linux-gkeopUpgrade linux-kvmUpgrade linux-lowlatencyUpgrade linux-oracleUpgrade linux-azure-5.15Upgrade linux-intel-iotg-5.15 | Jan 6, 2026 | Dec 24, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Dec 24, 2025 |
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