Bug 2482007 (CVE-2026-46096)

Summary: CVE-2026-46096 kernel: tpm2-sessions: Fix missing tpm_buf_destroy() in tpm2_read_public()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
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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 `tpm2-sessions` component. The `tpm2_read_public()` function fails to properly destroy a buffer on certain exit paths, leading to a page allocation leak. This resource exhaustion could allow a local attacker to cause a Denial of Service (DoS).
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Description OSIDB Bzimport 2026-05-27 15:06:45 UTC 
In the Linux kernel, the following vulnerability has been resolved:

tpm2-sessions: Fix missing tpm_buf_destroy() in tpm2_read_public()

tpm2_read_public() calls tpm_buf_init() but fails to call
tpm_buf_destroy() on two exit paths, leaking a page allocation:

1. When name_size() returns an error (unrecognized hash algorithm),
   the function returns directly without destroying the buffer.

2. On the success path, the buffer is never destroyed before
   returning.

All other error paths in the function correctly call
tpm_buf_destroy() before returning.

Fix both by adding the missing tpm_buf_destroy() calls.
Comment 1 Keith Grant 2026-05-27 16:50:16 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026052704-CVE-2026-46096-b0bd@gregkh/T