CVE-2024-39296 Affecting kernel-syms-azure package, versions <6.4.0-150600.8.8.1
Threat Intelligence
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Test your applications- Snyk IDSNYK-SLES156-KERNELSYMSAZURE-7681309
- published14 Aug 2024
- disclosed13 Aug 2024
Introduced: 13 Aug 2024
CVE-2024-39296 (opens in a new tab)How to fix?
Upgrade SLES:15.6 kernel-syms-azure to version 6.4.0-150600.8.8.1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-syms-azure package and not the kernel-syms-azure package as distributed by SLES.
See How to fix? for SLES:15.6 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
bonding: fix oops during rmmod
"rmmod bonding" causes an oops ever since commit cc317ea3d927 ("bonding: remove redundant NULL check in debugfs function"). Here are the relevant functions being called:
bonding_exit() bond_destroy_debugfs() debugfs_remove_recursive(bonding_debug_root); bonding_debug_root = NULL; <--------- SET TO NULL HERE bond_netlink_fini() rtnl_link_unregister() __rtnl_link_unregister() unregister_netdevice_many_notify() bond_uninit() bond_debug_unregister() (commit removed check for bonding_debug_root == NULL) debugfs_remove() simple_recursive_removal() down_write() -> OOPS
However, reverting the bad commit does not solve the problem completely because the original code contains a race that could cause the same oops, although it was much less likely to be triggered unintentionally:
CPU1 rmmod bonding bonding_exit() bond_destroy_debugfs() debugfs_remove_recursive(bonding_debug_root);
CPU2 echo -bond0 > /sys/class/net/bonding_masters bond_uninit() bond_debug_unregister() if (!bonding_debug_root)
CPU1 bonding_debug_root = NULL;
So do NOT revert the bad commit (since the removed checks were racy anyway), and instead change the order of actions taken during module removal. The same oops can also happen if there is an error during module init, so apply the same fix there.
References
- https://www.suse.com/security/cve/CVE-2024-39296.html
- https://bugzilla.suse.com/1226989
- https://git.kernel.org/stable/c/a45835a0bb6ef7d5ddbc0714dd760de979cb6ece
- https://git.kernel.org/stable/c/cf48aee81103ca06d09d73d33fb72f1191069aa6
- https://git.kernel.org/stable/c/f07224c16678a8af54ddc059b3d2d51885d7f35e