Bug 2388924 (CVE-2025-38546)

Summary: CVE-2025-38546 kernel: atm: clip: Fix memory leak of struct clip_vcc
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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Description OSIDB Bzimport 2025-08-16 12:01:40 UTC 
In the Linux kernel, the following vulnerability has been resolved:

atm: clip: Fix memory leak of struct clip_vcc.

ioctl(ATMARP_MKIP) allocates struct clip_vcc and set it to
vcc->user_back.

The code assumes that vcc_destroy_socket() passes NULL skb
to vcc->push() when the socket is close()d, and then clip_push()
frees clip_vcc.

However, ioctl(ATMARPD_CTRL) sets NULL to vcc->push() in
atm_init_atmarp(), resulting in memory leak.

Let's serialise two ioctl() by lock_sock() and check vcc->push()
in atm_init_atmarp() to prevent memleak.
Comment 1 Keith Grant 2025-08-18 15:33:00 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025081627-CVE-2025-38546-f8fa@gregkh/T