Vulnerabilities > CVE-2021-47291 - Out-of-bounds Read vulnerability in Linux Kernel
Attack vector
LOCAL Attack complexity
LOW Privileges required
LOW Confidentiality impact
HIGH Integrity impact
NONE Availability impact
HIGH Summary
In the Linux kernel, the following vulnerability has been resolved: ipv6: fix another slab-out-of-bounds in fib6_nh_flush_exceptions While running the self-tests on a KASAN enabled kernel, I observed a slab-out-of-bounds splat very similar to the one reported in commit 821bbf79fe46 ("ipv6: Fix KASAN: slab-out-of-bounds Read in fib6_nh_flush_exceptions"). We additionally need to take care of fib6_metrics initialization failure when the caller provides an nh. The fix is similar, explicitly free the route instead of calling fib6_info_release on a half-initialized object.
Vulnerable Configurations
Common Weakness Enumeration (CWE)
Common Attack Pattern Enumeration and Classification (CAPEC)
- Overread Buffers An adversary attacks a target by providing input that causes an application to read beyond the boundary of a defined buffer. This typically occurs when a value influencing where to start or stop reading is set to reflect positions outside of the valid memory location of the buffer. This type of attack may result in exposure of sensitive information, a system crash, or arbitrary code execution.
References
- https://git.kernel.org/stable/c/115784bcccf135c3a3548098153413d76f16aae0
- https://git.kernel.org/stable/c/115784bcccf135c3a3548098153413d76f16aae0
- https://git.kernel.org/stable/c/830251361425c5be044db4d826aaf304ea3d14c6
- https://git.kernel.org/stable/c/830251361425c5be044db4d826aaf304ea3d14c6
- https://git.kernel.org/stable/c/8fb4792f091e608a0a1d353dfdf07ef55a719db5
- https://git.kernel.org/stable/c/8fb4792f091e608a0a1d353dfdf07ef55a719db5
- https://git.kernel.org/stable/c/ce8fafb68051fba52546f8bbe8621f7641683680
- https://git.kernel.org/stable/c/ce8fafb68051fba52546f8bbe8621f7641683680