Bug 2309859 (CVE-2024-44996) - CVE-2024-44996 kernel: vsock: fix recursive ->recvmsg calls
Summary: CVE-2024-44996 kernel: vsock: fix recursive ->recvmsg calls
Keywords:
Status: NEW
Alias: CVE-2024-44996
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2309916
Blocks:
TreeView+ depends on / blocked
 
Reported: 2024-09-04 20:22 UTC by OSIDB Bzimport
Modified: 2024-09-18 15:40 UTC (History)
4 users (show)

Fixed In Version:
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Doc Text:
A vulnerability was found in the Linux kernel related to vsock, involving recursive calls due to BPF sockmap integration. When a vsock socket was added to a BPF sockmap, the prot->recvmsg function was replaced with vsock_bpf_recvmsg(). This could lead to recursion as vsock_bpf_recvmsg() called __vsock_recvmsg(), which then invokes vsock_connectible_recvmsg(), leading back to vsock_bpf_recvmsg().
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Last Closed:
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Description OSIDB Bzimport 2024-09-04 20:22:26 UTC 
In the Linux kernel, the following vulnerability has been resolved:

vsock: fix recursive ->recvmsg calls

After a vsock socket has been added to a BPF sockmap, its prot->recvmsg
has been replaced with vsock_bpf_recvmsg(). Thus the following
recursiion could happen:

vsock_bpf_recvmsg()
 -> __vsock_recvmsg()
  -> vsock_connectible_recvmsg()
   -> prot->recvmsg()
    -> vsock_bpf_recvmsg() again

We need to fix it by calling the original ->recvmsg() without any BPF
sockmap logic in __vsock_recvmsg().
Comment 1 Robb Gatica 2024-09-04 21:40:05 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024090448-CVE-2024-44996-8b26@gregkh/T
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