CVE-2021-47232
In the Linux kernel, the following vulnerability has been resolved: can: j1939: fix Use-after-Free, hold skb ref while in use This patch fixes a Use-after-Free found by the syzbot.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.62%). 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: can: j1939: fix Use-after-Free, hold skb ref while in use This patch fixes a Use-after-Free found by the syzbot. The problem is that a skb is taken from the per-session skb queue, without incrementing the ref count. This leads to a Use-after-Free if the skb is taken concurrently from the session queue due to a CTS.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.62% probability · 48th 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/1071065eeb33d32b7d98c2ce7591881ae7381705Patch
- https://git.kernel.org/stable/c/2030043e616cab40f510299f09b636285e0a3678Patch
- https://git.kernel.org/stable/c/22cba878abf646cd3a02ee7c8c2cef7afe66a256Patch
- https://git.kernel.org/stable/c/509ab6bfdd0c76daebbad0f0af07da712116de22Patch
- https://git.kernel.org/stable/c/1071065eeb33d32b7d98c2ce7591881ae7381705Patch
- https://git.kernel.org/stable/c/2030043e616cab40f510299f09b636285e0a3678Patch
- https://git.kernel.org/stable/c/22cba878abf646cd3a02ee7c8c2cef7afe66a256Patch
- https://git.kernel.org/stable/c/509ab6bfdd0c76daebbad0f0af07da712116de22Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.