CVE-2024-50036: net: do not delay dst_entries_add() in dst_release()
First published: Mon Oct 21 2024(Updated: )
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: 1) 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. 2) There is also discussion about removing this count of dst, which might happen in future kernels.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=3.10.50<3.11 | |
| Linux Kernel | >=3.12.26<3.13 | |
| Linux Kernel | >=3.14.14<3.15 | |
| Linux Kernel | >=3.15.7<3.16 | |
| Linux Kernel | >=3.16<6.6.57 | |
| Linux Kernel | >=6.7<6.11.4 | |
| Linux Kernel | =6.12-rc1 | |
| Linux Kernel | =6.12-rc2 | |
| debian/linux | <=5.10.223-1<=5.10.226-1 | 6.1.123-1 6.1.128-1 6.12.12-1 6.12.15-1 |
| debian/linux-6.1 | 6.1.119-1~deb11u1 |
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Reference Links
- https://git.kernel.org/stable/c/547087307bc19417b4f2bc85ba9664a3e8db5a6a
- https://git.kernel.org/stable/c/e3915f028b1f1c37e87542e5aadd33728c259d96
- https://git.kernel.org/stable/c/a60db84f772fc3a906c6c4072f9207579c41166f
- https://git.kernel.org/stable/c/eae7435b48ffc8e9be0ff9cfeae40af479a609dd
- https://git.kernel.org/stable/c/3c7c918ec0aa3555372c5a57f18780b7a96c5cfc
- https://git.kernel.org/stable/c/ac888d58869bb99753e7652be19a151df9ecb35d
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-50036
- https://nvd.nist.gov/vuln/detail/CVE-2024-50036
- https://launchpad.net/bugs/cve/CVE-2024-50036
- https://security-tracker.debian.org/tracker/CVE-2024-50036
- https://ubuntu.com/security/CVE-2024-50036
- https://git.kernel.org/linus/ac888d58869bb99753e7652be19a151df9ecb35d
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