CVE-2021-47482 Affecting kernel-source-azure package, versions <5.14.21-150500.33.57.1
Threat Intelligence
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Test your applications- Snyk IDSNYK-SLES155-KERNELSOURCEAZURE-7252843
- published14 Jun 2024
- disclosed13 Jun 2024
Introduced: 13 Jun 2024
CVE-2021-47482 (opens in a new tab)How to fix?
Upgrade SLES:15.5 kernel-source-azure to version 5.14.21-150500.33.57.1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-source-azure package and not the kernel-source-azure package as distributed by SLES.
See How to fix? for SLES:15.5 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
net: batman-adv: fix error handling
Syzbot reported ODEBUG warning in batadv_nc_mesh_free(). The problem was in wrong error handling in batadv_mesh_init().
Before this patch batadv_mesh_init() was calling batadv_mesh_free() in case of any batadv_*_init() calls failure. This approach may work well, when there is some kind of indicator, which can tell which parts of batadv are initialized; but there isn't any.
All written above lead to cleaning up uninitialized fields. Even if we hide ODEBUG warning by initializing bat_priv->nc.work, syzbot was able to hit GPF in batadv_nc_purge_paths(), because hash pointer in still NULL. [1]
To fix these bugs we can unwind batadv_*init() calls one by one. It is good approach for 2 reasons: 1) It fixes bugs on error handling path 2) It improves the performance, since we won't call unneeded batadv*_free() functions.
So, this patch makes all batadv_*init() clean up all allocated memory before returning with an error to no call correspoing batadv*_free() and open-codes batadv_mesh_free() with proper order to avoid touching uninitialized fields.
References
- https://www.suse.com/security/cve/CVE-2021-47482.html
- https://bugzilla.suse.com/1224909
- https://git.kernel.org/stable/c/07533f1a673ce1126d0a72ef1e4b5eaaa3dd6d20
- https://git.kernel.org/stable/c/0c6b199f09be489c48622537a550787fc80aea73
- https://git.kernel.org/stable/c/6422e8471890273994fe8cc6d452b0dcd2c9483e
- https://git.kernel.org/stable/c/6f68cd634856f8ca93bafd623ba5357e0f648c68
- https://git.kernel.org/stable/c/a8f7359259dd5923adc6129284fdad12fc5db347
- https://git.kernel.org/stable/c/b0a2cd38553c77928ef1646ed1518486b1e70ae8
- https://git.kernel.org/stable/c/e50f957652190b5a88a8ebce7e5ab14ebd0d3f00
- https://git.kernel.org/stable/c/fbf150b16a3635634b7dfb7f229d8fcd643c6c51