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KEYS: trusted: Fix TPM teardown ordering

Type: advisorySource: Official CVE List1 source record

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 opera

Announced Source revision 1
Original source ↗

CVE-2026-89763

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-89763

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
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Prerequisites
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Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400",
        "lessThan": "81dfc6c665547a4e41721b6716f894f263a5e03f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400",
        "lessThan": "3d67b4acbfc7af331d887a8efc04bef6573b8a7a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400",
        "lessThan": "753c978f2400f9783eb524842a975d3ac950d511",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400",
        "lessThan": "2f7541afbc57fe9d26769a22c31d8ce8790c9a19",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400",
        "lessThan": "5e2d672280d97d83de43031d93761b12dadd7b8a",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "security/keys/trusted-keys/trusted_tpm1.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.1"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.1",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.111",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.50",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.4",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "security/keys/trusted-keys/trusted_tpm1.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-89763

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#46724 · Revision 1
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Publisher date
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