CVE - CVE-2024-50186

CVE-ID
CVE-2024-50186	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
In the Linux kernel, the following vulnerability has been resolved: net: explicitly clear the sk pointer, when pf->create fails We have recently noticed the exact same KASAN splat as in commit 6cd4a78d962b ("net: do not leave a dangling sk pointer, when socket creation fails"). The problem is that commit did not fully address the problem, as some pf->create implementations do not use sk_common_release in their error paths. For example, we can use the same reproducer as in the above commit, but changing ping to arping. arping uses AF_PACKET socket and if packet_create fails, it will just sk_free the allocated sk object. While we could chase all the pf->create implementations and make sure they NULL the freed sk object on error from the socket, we can't guarantee future protocols will not make the same mistake. So it is easier to just explicitly NULL the sk pointer upon return from pf->create in __sock_create. We do know that pf->create always releases the allocated sk object on error, so if the pointer is not NULL, it is definitely dangling.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/563e6892e21d6ecabdf62103fc4e7b326d212334 URL:https://git.kernel.org/stable/c/563e6892e21d6ecabdf62103fc4e7b326d212334 MISC:https://git.kernel.org/stable/c/631083143315d1b192bd7d915b967b37819e88ea URL:https://git.kernel.org/stable/c/631083143315d1b192bd7d915b967b37819e88ea MISC:https://git.kernel.org/stable/c/8e1b72fd74bf9da3b099d09857f4e7f114f38e12 URL:https://git.kernel.org/stable/c/8e1b72fd74bf9da3b099d09857f4e7f114f38e12 MISC:https://git.kernel.org/stable/c/b7d22a79ff4e962b8af5ffe623abd1d6c179eb9f URL:https://git.kernel.org/stable/c/b7d22a79ff4e962b8af5ffe623abd1d6c179eb9f MISC:https://git.kernel.org/stable/c/daf462ff3cde6ecf22b98d9ae770232c10d28de2 URL:https://git.kernel.org/stable/c/daf462ff3cde6ecf22b98d9ae770232c10d28de2
Assigning CNA
kernel.org
Date Record Created
20241021	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20241021)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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