Vulnerability Details CVE-2023-53189
In the Linux kernel, the following vulnerability has been resolved:
ipv6/addrconf: fix a potential refcount underflow for idev
Now in addrconf_mod_rs_timer(), reference idev depends on whether
rs_timer is not pending. Then modify rs_timer timeout.
There is a time gap in [1], during which if the pending rs_timer
becomes not pending. It will miss to hold idev, but the rs_timer
is activated. Thus rs_timer callback function addrconf_rs_timer()
will be executed and put idev later without holding idev. A refcount
underflow issue for idev can be caused by this.
if (!timer_pending(&idev->rs_timer))
in6_dev_hold(idev);
<--------------[1]
mod_timer(&idev->rs_timer, jiffies + when);
To fix the issue, hold idev if mod_timer() return 0.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 10.3%
CVSS Severity
References
- https://git.kernel.org/stable/c/06a0716949c22e2aefb648526580671197151acc
- https://git.kernel.org/stable/c/1f656e483eb4733d62f18dfb206a49b78f60f495
- https://git.kernel.org/stable/c/2ad31ce40e8182860b631e37209e93e543790b7c
- https://git.kernel.org/stable/c/436b7cc7eae7851c184b671ed7a4a64c750b86f7
- https://git.kernel.org/stable/c/82abd1c37d3bf2a2658b34772c17a25a6f9cca42
- https://git.kernel.org/stable/c/c6395e32935d35e6f935e7caf1c2dac5a95943b4
- https://git.kernel.org/stable/c/c7eeba47058532f6077d6a658e38b6698f6ae71a
- https://git.kernel.org/stable/c/df62fdcd004afa72ecbed0e862ebb983acd3aa57