CVE-2023-53219
In the Linux kernel, the following vulnerability has been resolved: media: netup_unidvb: fix use-after-free at del_timer() When Universal DVB card is detaching, netup_unidvb_dma_fini() uses del_timer() to stop dma->timeout timer.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.16%). 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: netup_unidvb: fix use-after-free at del_timer() When Universal DVB card is detaching, netup_unidvb_dma_fini() uses del_timer() to stop dma->timeout timer. But when timer handler netup_unidvb_dma_timeout() is running, del_timer() could not stop it. As a result, the use-after-free bug could happen. The process is shown below: (cleanup routine) | (timer routine) | mod_timer(&dev->tx_sim_timer, ..) netup_unidvb_finidev() | (wait a time) netup_unidvb_dma_fini() | netup_unidvb_dma_timeout() del_timer(&dma->timeout); | | ndev->pci_dev->dev //USE Fix by changing del_timer() to del_timer_sync().
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.16% probability · 6th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/051af3f0b7d1cd8ab7f3e2523ad8ae1af44caba3Patch
- https://git.kernel.org/stable/c/07821524f67bf920342bc84ae8b3dea2a315a89ePatch
- https://git.kernel.org/stable/c/0f5bb36bf9b39a2a96e730bf4455095b50713f63Patch
- https://git.kernel.org/stable/c/1550bcf2983ae1220cc8ab899a39a423fa7cb523Patch
- https://git.kernel.org/stable/c/90229e9ee957d4514425e4a4d82c50ab5d57ac4dPatch
- https://git.kernel.org/stable/c/c8f9c05e1ebcc9c7bc211cc8b74d8fb86a8756fcPatch
- https://git.kernel.org/stable/c/dd5c77814f290b353917df329f36de1472d47154Patch
- https://git.kernel.org/stable/c/f9982db735a8495eee14267cf193c806b957e942Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.