Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400 before 81dfc6c665547a4e41721b6716f894f263a5e03f; affected 0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400 before 3d67b4acbfc7af331d887a8efc04bef6573b8a7a; affected 0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400 before 753c978f2400f9783eb524842a975d3ac950d511; affected 0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400 before 2f7541afbc57fe9d26769a22c31d8ce8790c9a19; affected 0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400 before 5e2d672280d97d83de43031d93761b12dadd7b8a |
| Linux / Linux | affected 5.1; unaffected 0 before 5.1; unaffected 6.6.160 through 6.6.*; unaffected 6.12.111 through 6.12.*; unaffected 6.18.50 through 6.18.*; unaffected 7.2.4 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/81dfc6c665547a4e41721b6716f894f263a5e03f
- https://git.kernel.org/stable/c/3d67b4acbfc7af331d887a8efc04bef6573b8a7a
- https://git.kernel.org/stable/c/753c978f2400f9783eb524842a975d3ac950d511
- https://git.kernel.org/stable/c/2f7541afbc57fe9d26769a22c31d8ce8790c9a19
- https://git.kernel.org/stable/c/5e2d672280d97d83de43031d93761b12dadd7b8a
ADP enrichment
No English description supplied.
No references supplied.