Bug 2482056 (CVE-2026-46098)

Summary: CVE-2026-46098 kernel: net: caif: clear client service pointer on teardown
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Doc Text:
A flaw was found in the Linux kernel's CAIF network module. When a client is torn down, the `caif_free_client()` function frees a service pointer but leaves it in a stale state. If the socket is later destroyed, `caif_free_client()` may be called again, attempting to use the previously freed pointer. This can lead to memory corruption and potentially cause a system crash, resulting in a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-05-27 15:09:10 UTC 
In the Linux kernel, the following vulnerability has been resolved:

net: caif: clear client service pointer on teardown

`caif_connect()` can tear down an existing client after remote shutdown by
calling `caif_disconnect_client()` followed by `caif_free_client()`.
`caif_free_client()` releases the service layer referenced by
`adap_layer->dn`, but leaves that pointer stale.

When the socket is later destroyed, `caif_sock_destructor()` calls
`caif_free_client()` again and dereferences the freed service pointer.

Clear the client/service links before releasing the service object so
repeated teardown becomes harmless.
Comment 1 Keith Grant 2026-05-27 16:46:24 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026052704-CVE-2026-46098-ec82@gregkh/T