Use After Free Affecting kernel-tools package, versions *
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Test your applications- Snyk ID SNYK-RHEL8-KERNELTOOLS-8286813
- published 23 Oct 2024
- disclosed 21 Oct 2024
Introduced: 21 Oct 2024
CVE-2024-50036 Open this link in a new tabHow to fix?
There is no fixed version for RHEL:8
kernel-tools
.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-tools
package and not the kernel-tools
package as distributed by RHEL
.
See How to fix?
for RHEL:8
relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
net: do not delay dst_entries_add() in dst_release()
dst_entries_add() uses per-cpu data that might be freed at netns dismantle from ip6_route_net_exit() calling dst_entries_destroy()
Before ip6_route_net_exit() can be called, we release all the dsts associated with this netns, via calls to dst_release(), which waits an rcu grace period before calling dst_destroy()
dst_entries_add() use in dst_destroy() is racy, because dst_entries_destroy() could have been called already.
Decrementing the number of dsts must happen sooner.
Notes:
in CONFIG_XFRM case, dst_destroy() can call dst_release_immediate(child), this might also cause UAF if the child does not have DST_NOCOUNT set. IPSEC maintainers might take a look and see how to address this.
There is also discussion about removing this count of dst, which might happen in future kernels.
References
- https://access.redhat.com/security/cve/CVE-2024-50036
- https://git.kernel.org/stable/c/3c7c918ec0aa3555372c5a57f18780b7a96c5cfc
- https://git.kernel.org/stable/c/ac888d58869bb99753e7652be19a151df9ecb35d
- https://git.kernel.org/stable/c/eae7435b48ffc8e9be0ff9cfeae40af479a609dd
- https://git.kernel.org/stable/c/a60db84f772fc3a906c6c4072f9207579c41166f
- https://git.kernel.org/stable/c/e3915f028b1f1c37e87542e5aadd33728c259d96
- https://git.kernel.org/stable/c/547087307bc19417b4f2bc85ba9664a3e8db5a6a