Answer in brief
CVE-2026-89763 records a High severity (CVSS 7.8) vulnerability in KEYS: trusted: Fix TPM teardown ordering. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400 <753c978f2400f9783eb524842a975d3ac950d511 || >=0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400 <2f7541afbc57fe9d26769a22c31d8ce8790c9a19 || >=0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400 <5e2d672280d97d83de43031d93761b12dadd7b8a | 753c978f2400f9783eb524842a975d3ac950d511, 2f7541afbc57fe9d26769a22c31d8ce8790c9a19, 5e2d672280d97d83de43031d93761b12dadd7b8a |
| Linux/Linuxgeneric | 5.1 | Not reported |
| Linux/Linuxgeneric | >=0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400 <3d67b4acbfc7af331d887a8efc04bef6573b8a7a || >=0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400 <753c978f2400f9783eb524842a975d3ac950d511 || >=0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400 <2f7541afbc57fe9d26769a22c31d8ce8790c9a19 || >=0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400 <5e2d672280d97d83de43031d93761b12dadd7b8a | 3d67b4acbfc7af331d887a8efc04bef6573b8a7a, 753c978f2400f9783eb524842a975d3ac950d511, 2f7541afbc57fe9d26769a22c31d8ce8790c9a19, 5e2d672280d97d83de43031d93761b12dadd7b8a |
| Linux/Linuxgeneric | >=0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400 <81dfc6c665547a4e41721b6716f894f263a5e03f || >=0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400 <3d67b4acbfc7af331d887a8efc04bef6573b8a7a || >=0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400 <753c978f2400f9783eb524842a975d3ac950d511 || >=0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400 <2f7541afbc57fe9d26769a22c31d8ce8790c9a19 || >=0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400 <5e2d672280d97d83de43031d93761b12dadd7b8a | 81dfc6c665547a4e41721b6716f894f263a5e03f, 3d67b4acbfc7af331d887a8efc04bef6573b8a7a, 753c978f2400f9783eb524842a975d3ac950d511, 2f7541afbc57fe9d26769a22c31d8ce8790c9a19, 5e2d672280d97d83de43031d93761b12dadd7b8a |
Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 21, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 11, 2026
In the Linux kernel, the following vulnerability has been resolved: KEYS: trusted: Fix TPM teardown ordering trusted_tpm_exit() drops the TPM chip reference and frees the digest array before unregistering the trusted key type. key_type_lookup() holds key_types_sem for reading until the key operation finishes, while unregister_key_type() takes it for writing. It therefore provides the synchronization point that must precede backend teardown. The current order permits this interleaving: CPU 0 CPU 1 trusted_tpm_exit() key_type_lookup("trusted") put_device(&chip->dev) trusted_tpm_seal() kfree(digests) pcrlock() unregister_key_type() tpm_pcr_extend(..., digests) CPU 1 can consequently dereference the freed digest array. The chip can also be released before callbacks stop using it. KASAN reported: BUG: KASAN: slab-use-after-free in tpm_pcr_extend+0x1f0/0x200 Read of size 2 at addr ffff88810872d000 by task poc/89 Call Trace: tpm_pcr_extend+0x1f0/0x200 pcrlock+0x42/0x70 [trusted] trusted_tpm_seal+0x1b6/0x570 [trusted] trusted_instantiate+0x293/0x340 [trusted] __key_instantiate_and_link+0xb2/0x2b0 __key_create_or_update+0x61e/0xb50 __do_sys_add_key+0x1b8/0x310 Allocated by task 88: __kmalloc_noprof+0x1a7/0x490 do_one_initcall+0xa1/0x390 do_init_module+0x2df/0x840 Freed by task 90: kfree+0x131/0x3c0 trusted_tpm_exit+0x59/0xa0 [trusted] __do_sys_delete_module+0x346/0x510 Move unregister_key_type() before releasing either resource. This stops new lookups and waits for in-flight key operations to finish before the backend state is destroyed.
Quoted source text, attributed separately from HOL analysis.