Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: tpm: use try_get_ops() in tpm-space.c As part of the series conversion to remove nested TPM operations: https://lore.kernel.org/all/20190205224723.19671-1-jarkko.sakkinen@linux.intel.com/ exposure of the chip->tpm_mutex was removed from much of the upper level code. In this conversion, tpm2_del_space() was missed. This didn't matter much because it's usually called closely after a converted operation, so there's only a very tiny race window where the chip can be removed before the space flushing is done which causes a NULL deref on the mutex. However, there are reports of this window being hit in practice, so fix this by converting tpm2_del_space() to use tpm_try_get_ops(), which performs all the teardown checks before acquring the mutex.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 4d57856a21ed2abe33412e0526cc84bdcf67ea08 before 5b1d2561a03e534064b51c50c774657833d3d2cf; affected 4d57856a21ed2abe33412e0526cc84bdcf67ea08 before 95193d12f10a8a088843b25e0f5fe1d83ec6b079; affected 4d57856a21ed2abe33412e0526cc84bdcf67ea08 before 476ddd23f818fb94cf86fb5617f3bb9a7c92113d; affected 4d57856a21ed2abe33412e0526cc84bdcf67ea08 before eda1662cce964c8a65bb86321f8d9cfa6e9ceaab; affected 4d57856a21ed2abe33412e0526cc84bdcf67ea08 before ba84f9a48366dcc3cdef978599433efe101dd5bd; affected 4d57856a21ed2abe33412e0526cc84bdcf67ea08 before fb5abce6b2bb5cb3d628aaa63fa821da8c4600f9 |
| Linux / Linux | affected 4.12; unaffected 0 before 4.12; unaffected 5.4.188 through 5.4.*; unaffected 5.10.109 through 5.10.*; unaffected 5.15.32 through 5.15.*; unaffected 5.16.18 through 5.16.*; unaffected 5.17.1 through 5.17.*; unaffected 5.18 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/5b1d2561a03e534064b51c50c774657833d3d2cf
- https://git.kernel.org/stable/c/95193d12f10a8a088843b25e0f5fe1d83ec6b079
- https://git.kernel.org/stable/c/476ddd23f818fb94cf86fb5617f3bb9a7c92113d
- https://git.kernel.org/stable/c/eda1662cce964c8a65bb86321f8d9cfa6e9ceaab
- https://git.kernel.org/stable/c/ba84f9a48366dcc3cdef978599433efe101dd5bd
- https://git.kernel.org/stable/c/fb5abce6b2bb5cb3d628aaa63fa821da8c4600f9