Bug 2309849 (CVE-2024-44986)

Summary: CVE-2024-44986 kernel: ipv6: fix possible UAF in ip6_finish_output2()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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A possible use-after-free was found in the Linux kernel in ip6_finish_output2().
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2309926    
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Description OSIDB Bzimport 2024-09-04 20:21:48 UTC 
In the Linux kernel, the following vulnerability has been resolved:

ipv6: fix possible UAF in ip6_finish_output2()

If skb_expand_head() returns NULL, skb has been freed
and associated dst/idev could also have been freed.

We need to hold rcu_read_lock() to make sure the dst and
associated idev are alive.
Comment 1 Robb Gatica 2024-09-04 21:56:23 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024090445-CVE-2024-44986-1197@gregkh/T