GSD-2021-1001540 blktrace: Fix uaf in blk_trace access after removing by sysfs
A use-after-free vulnerability in the Linux kernel's blktrace module allows local attackers with high privileges to cause denial of service or escalate privileges.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is GSD-2021-1001540?
GSD-2021-1001540 is an use after free vulnerability in Kernel, published on 19 Oct 2021. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
blktrace: Fix uaf in blk_trace access after removing by sysfs
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v4.14.249 by commit d56171d9360c0170c5c5f8f7e2362a2e999eca40, it was introduced in version v2.6.30 by commit c71a896154119f4ca9e89d6078f5f63ad60ef199. For more details please see the references link.
Which versions are affected by GSD-2021-1001540?
1 open source package ship an affected version, including Kernel.
| Package | Affected | Fixed in |
|---|---|---|
Kernel Linux | All versions | None |
How do I fix GSD-2021-1001540?
No fix has been published for GSD-2021-1001540 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is GSD-2021-1001540 being exploited?
There is no known exploitation of GSD-2021-1001540 in the wild and no public exploit code.