CVE-2023-52847: media: bttv: fix use after free error due to btv->timeout timer

Severity: high (CVSS 7.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-05-21 · updated 2026-08-04
Weakness: CWE-362

Description

In the Linux kernel, the following vulnerability has been resolved: media: bttv: fix use after free error due to btv->timeout timer There may be some a race condition between timer function bttv_irq_timeout and bttv_remove. The timer is setup in probe and there is no timer_delete operation in remove function. When it hit kfree btv, the function might still be invoked, which will cause use after free bug. This bug is found by static analysis, it may be false positive. Fix it by adding del_timer_sync invoking to the remove function. cpu0 cpu1 bttv_probe ->timer_setup ->bttv_set_dma ->mod_timer; bttv_remove ->kfree(btv); ->bttv_irq_timeout ->USE btv

Affected products

Linux kernel: from 4.15 before 4.19.299; from 4.20 before 5.4.261; from 5.5 before 5.10.201; from 5.11 before 5.15.139; from 5.16 before 6.1.63; from 6.2 before 6.5.12 — fixed in 4.19.299, 5.10.201, 5.15.139, 5.4.261, 6.1.63, 6.5.12

How to fix

Upgrade to a fixed version: Linux kernel 4.19.299, 5.10.201, 5.15.139, 5.4.261. Check the vendor advisory for mitigations.

References

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