CVE-2021-46922 KEYS: trusted: Fix TPM reservation for seal/unseal

2024-02-2709:36:27

Linux

github.com

linux kernel

tpm reservation

imbalance

AI Score

5.4

Confidence

High

SSVC

Exploitation

none

Automatable

Technical Impact

partial

JSON

In the Linux kernel, the following vulnerability has been resolved:

KEYS: trusted: Fix TPM reservation for seal/unseal

The original patch 8c657a0590de (“KEYS: trusted: Reserve TPM for seal
and unseal operations”) was correct on the mailing list:

https://lore.kernel.org/linux-integrity/[email protected]/

But somehow got rebased so that the tpm_try_get_ops() in
tpm2_seal_trusted() got lost. This causes an imbalanced put of the
TPM ops and causes oopses on TIS based hardware.

This fix puts back the lost tpm_try_get_ops()

CNA Affected

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "67118bb78d72",
        "lessThan": "bf84ef2dd2cc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "498b8fc1cdc1",
        "lessThan": "39c8d760d44c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "8c657a0590de",
        "lessThan": "9d5171eab462",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "security/keys/trusted-keys/trusted_tpm2.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.10.20",
        "lessThan": "5.10.33",
        "versionType": "custom"
      },
      {
        "status": "affected",
        "version": "5.11.3",
        "lessThan": "5.11.17",
        "versionType": "custom"
      }
    ],
    "programFiles": [
      "security/keys/trusted-keys/trusted_tpm2.c"
    ],
    "defaultStatus": "unaffected"
  }
]