CVE-2026-72151
HighCVSS 8.4Exploitation Probability (EPSS)
Low risk8th percentile - higher than 8% of all known CVEs
Summary
In the Linux kernel, the TPM driver (tpm2-sessions) function tpm_buf_append_salt() calls asynchronous KPP operations without setting a completion callback and immediately frees the request, leading to use-after-free. The issue occurs automatically during entropy polling.
Risk Assessment
Use-after-free can lead to system crash or potentially code execution by a local attacker.
Recommendation
Apply the Linux kernel patch that installs a completion callback and uses crypto_wait_req() for KPP operations, and propagates errors.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: tpm: tpm2-sessions: wait for async KPP completion in tpm_buf_append_salt tpm_buf_append_salt() in drivers/char/tpm/tpm2-sessions.c calls crypto_kpp_generate_public_key() and crypto_kpp_compute_shared_secret() without installing a completion callback, discards both return values, and immediately frees the kpp_request via kpp_request_free(). When the resolved ecdh-nist-p256 KPP backend is asynchronous (atmel-ecc, HPRE, keembay-ocs), either operation returns -EINPROGRESS and the deferred completion worker dereferences the freed request. The path fires automatically from the hwrng_fillfn kernel thread via tpm_get_random -> tpm2_get_random -> tpm2_start_auth_session -> tpm_buf_append_salt on every entropy poll, without any userland action. Install crypto_req_done as the completion callback, wrap both KPP operations in crypto_wait_req(), and propagate errors to the caller. The wait is a no-op for synchronous backends.