CVE-2026-72151tpm: tpm2-sessions: wait for async KPP completion in tpm_buf_append_salt
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 8.4 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Aug 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 1085b8276bb4239daa7008f0dcd5c973e4bd690f builds before 111e520efbe82b324bc42b1999b723c0619eea6d; 1085b8276bb4239daa7008f0dcd5c973e4bd690f builds before 934d1cd40e2893bf7a041b54f6afd1c008d7a21c; from 1085b8276bb4239daa7008f0dcd5c973e4bd690f before 493333f167926c7adab8e7563e21ad71d8af84fa; from 1085b8276bb4239daa7008f0dcd5c973e4bd690f before 73851a7c43dfa52d2ed9415889b33daf85da0ed9 | CNA record |
References
- https://git.kernel.org/stable/c/111e520efbe82b324bc42b1999b723c0619eea6d
- https://git.kernel.org/stable/c/934d1cd40e2893bf7a041b54f6afd1c008d7a21c
- https://git.kernel.org/stable/c/493333f167926c7adab8e7563e21ad71d8af84fa
- https://git.kernel.org/stable/c/73851a7c43dfa52d2ed9415889b33daf85da0ed9
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.