CVE-2023-52847
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.19%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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
- CVSS 3.1
- 7.0 HIGHCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.19% probability · 8th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-362, CWE-416
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/1871014d6ef4812ad11ef7d838d73ce09d632267Mailing List, Patch
- https://git.kernel.org/stable/c/20568d06f6069cb835e05eed432edf962645d226Mailing List, Patch
- https://git.kernel.org/stable/c/2f3d9198cdae1cb079ec8652f4defacd481eab2bMailing List, Patch
- https://git.kernel.org/stable/c/51c94256a83fe4e17406c66ff3e1ad7d242d8574Mailing List, Patch
- https://git.kernel.org/stable/c/847599fffa528b2cdec4e21b6bf7586dad982132Mailing List, Patch
- https://git.kernel.org/stable/c/b35fdade92c5058a5e727e233fe263b828de2c9aMailing List, Patch
- https://git.kernel.org/stable/c/bbc3b8dd2cb7817e703f112d988e4f4728f0f2a9Mailing List, Patch
- https://git.kernel.org/stable/c/bd5b50b329e850d467e7bcc07b2b6bde3752fbdaMailing List, Patch
- https://git.kernel.org/stable/c/1871014d6ef4812ad11ef7d838d73ce09d632267Mailing List, Patch
- https://git.kernel.org/stable/c/20568d06f6069cb835e05eed432edf962645d226Mailing List, Patch
- https://git.kernel.org/stable/c/2f3d9198cdae1cb079ec8652f4defacd481eab2bMailing List, Patch
- https://git.kernel.org/stable/c/51c94256a83fe4e17406c66ff3e1ad7d242d8574Mailing List, Patch
- https://git.kernel.org/stable/c/847599fffa528b2cdec4e21b6bf7586dad982132Mailing List, Patch
- https://git.kernel.org/stable/c/b35fdade92c5058a5e727e233fe263b828de2c9aMailing List, Patch
- https://git.kernel.org/stable/c/bbc3b8dd2cb7817e703f112d988e4f4728f0f2a9Mailing List, Patch
- https://git.kernel.org/stable/c/bd5b50b329e850d467e7bcc07b2b6bde3752fbdaMailing List, Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.