CVE-2026-89763 (GCVE-0-2026-89763)
Vulnerability from cvelistv5
Published
2026-09-11 19:47
Modified
2026-10-30 12:33
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400
Version: 0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400
Version: 0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400
Version: 0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400
Version: 0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400
Version: 0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400
Version: 0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400
Version: 0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKEYS: trusted: Fix TPM teardown ordering\n\ntrusted_tpm_exit() drops the TPM chip reference and frees the digest\narray before unregistering the trusted key type. key_type_lookup()\nholds key_types_sem for reading until the key operation finishes, while\nunregister_key_type() takes it for writing. It therefore provides the\nsynchronization point that must precede backend teardown.\n\nThe current order permits this interleaving:\n\n  CPU 0                              CPU 1\n  trusted_tpm_exit()                 key_type_lookup(\"trusted\")\n    put_device(\u0026chip-\u003edev)             trusted_tpm_seal()\n    kfree(digests)                       pcrlock()\n    unregister_key_type()                  tpm_pcr_extend(..., digests)\n\nCPU 1 can consequently dereference the freed digest array. The chip can\nalso be released before callbacks stop using it.\n\nKASAN reported:\n\n  BUG: KASAN: slab-use-after-free in tpm_pcr_extend+0x1f0/0x200\n  Read of size 2 at addr ffff88810872d000 by task poc/89\n  Call Trace:\n    tpm_pcr_extend+0x1f0/0x200\n    pcrlock+0x42/0x70 [trusted]\n    trusted_tpm_seal+0x1b6/0x570 [trusted]\n    trusted_instantiate+0x293/0x340 [trusted]\n    __key_instantiate_and_link+0xb2/0x2b0\n    __key_create_or_update+0x61e/0xb50\n    __do_sys_add_key+0x1b8/0x310\n  Allocated by task 88:\n    __kmalloc_noprof+0x1a7/0x490\n    do_one_initcall+0xa1/0x390\n    do_init_module+0x2df/0x840\n  Freed by task 90:\n    kfree+0x131/0x3c0\n    trusted_tpm_exit+0x59/0xa0 [trusted]\n    __do_sys_delete_module+0x346/0x510\n\nMove unregister_key_type() before releasing either resource. This stops\nnew lookups and waits for in-flight key operations to finish before the\nbackend state is destroyed."
        }
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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              "value": "AV:L - The UAF is reached only via the local add_key(2) syscall (trusted_instantiate \u2192 trusted_tpm_seal \u2192 pcrlock/tpm_* on global chip/digests) racing trusted_tpm_exit() during delete_module of trusted.ko; no network or adjacent protocol processes this key-type teardown.\nAC:L - The attacker controls both sides of the race by issuing concurrent add_key(\"trusted\") while trusted.ko is unloaded; key_type_lookup() still succeeds until unregister_key_type(), so the documented CPU0/CPU1 interleaving is reliably repeatable without uncontrollable victim memory layout.\nPR:L - add_key(2) on a caller-owned keyring has no capable() check in trusted_instantiate(); every seal/unseal uses the global chip after put_device, and only optional pcrlock() needs CAP_SYS_ADMIN. Per CNA driver-removal UAF precedent, concurrent rmmod of trusted.ko does not require the attacker to hold CAP_SYS_MODULE.\nUI:N - Exploitation is driven by the attacker\u0027s own add_key threads and module-unload timing; no separate victim must mount a filesystem, open a device, or take any other action.\nS:U - The vulnerability is a standard in-kernel slab use-after-free affecting host kernel memory and availability; it does not cross a VM, IOMMU, or other distinct security-authority boundary.\nC:H - KASAN shows a slab-use-after-free read of the freed digests array in tpm_pcr_extend, and put_device may free tpm_chip while callbacks still dereference it; per kernel CNA guidance a UAF enables object reuse and arbitrary kernel read, so Confidentiality is High.\nI:H - Seal/unseal after teardown calls tpm_try_get_ops() which mutates chip (get_device, mutex_lock) and PCR extend consumes the UAF\u0027d digest buffer; use-after-free is heap-sprayable into write and control-flow primitives, so Integrity is High.\nA:H - The KASAN report is a kernel slab-use-after-free oops during add_key versus delete_module; any such UAF can panic or hang the kernel, scoring Availability High even when not fully exploited for code execution."
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        {
          "url": "https://git.kernel.org/stable/c/5e2d672280d97d83de43031d93761b12dadd7b8a"
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      "title": "KEYS: trusted: Fix TPM teardown ordering",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89763",
    "datePublished": "2026-09-11T19:47:04.352Z",
    "dateReserved": "2026-09-11T19:38:34.764Z",
    "dateUpdated": "2026-10-30T12:33:00.263Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
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Per CNA driver-removal UAF precedent, concurrent rmmod of trusted.ko does not require the attacker to hold CAP_SYS_MODULE.\\nUI:N - Exploitation is driven by the attacker\u0027s own add_key threads and module-unload timing; no separate victim must mount a filesystem, open a device, or take any other action.\\nS:U - The vulnerability is a standard in-kernel slab use-after-free affecting host kernel memory and availability; it does not cross a VM, IOMMU, or other distinct security-authority boundary.\\nC:H - KASAN shows a slab-use-after-free read of the freed digests array in tpm_pcr_extend, and put_device may free tpm_chip while callbacks still dereference it; per kernel CNA guidance a UAF enables object reuse and arbitrary kernel read, so Confidentiality is High.\\nI:H - Seal/unseal after teardown calls tpm_try_get_ops() which mutates chip (get_device, mutex_lock) and PCR extend consumes the UAF\u0027d digest buffer; use-after-free is heap-sprayable into write and control-flow primitives, so Integrity is High.\\nA:H - The KASAN report is a kernel slab-use-after-free oops during add_key versus delete_module; any such UAF can panic or hang the kernel, scoring Availability High even when not fully exploited for code execution.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"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\": \"6.12.111\", \"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\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/3d67b4acbfc7af331d887a8efc04bef6573b8a7a\"}, {\"url\": \"https://git.kernel.org/stable/c/753c978f2400f9783eb524842a975d3ac950d511\"}, {\"url\": \"https://git.kernel.org/stable/c/2f7541afbc57fe9d26769a22c31d8ce8790c9a19\"}, {\"url\": \"https://git.kernel.org/stable/c/5e2d672280d97d83de43031d93761b12dadd7b8a\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nKEYS: trusted: Fix TPM teardown ordering\\n\\ntrusted_tpm_exit() drops the TPM chip reference and frees the digest\\narray before unregistering the trusted key type. key_type_lookup()\\nholds key_types_sem for reading until the key operation finishes, while\\nunregister_key_type() takes it for writing. It therefore provides the\\nsynchronization point that must precede backend teardown.\\n\\nThe current order permits this interleaving:\\n\\n  CPU 0                              CPU 1\\n  trusted_tpm_exit()                 key_type_lookup(\\\"trusted\\\")\\n    put_device(\u0026chip-\u003edev)             trusted_tpm_seal()\\n    kfree(digests)                       pcrlock()\\n    unregister_key_type()                  tpm_pcr_extend(..., digests)\\n\\nCPU 1 can consequently dereference the freed digest array. The chip can\\nalso be released before callbacks stop using it.\\n\\nKASAN reported:\\n\\n  BUG: KASAN: slab-use-after-free in tpm_pcr_extend+0x1f0/0x200\\n  Read of size 2 at addr ffff88810872d000 by task poc/89\\n  Call Trace:\\n    tpm_pcr_extend+0x1f0/0x200\\n    pcrlock+0x42/0x70 [trusted]\\n    trusted_tpm_seal+0x1b6/0x570 [trusted]\\n    trusted_instantiate+0x293/0x340 [trusted]\\n    __key_instantiate_and_link+0xb2/0x2b0\\n    __key_create_or_update+0x61e/0xb50\\n    __do_sys_add_key+0x1b8/0x310\\n  Allocated by task 88:\\n    __kmalloc_noprof+0x1a7/0x490\\n    do_one_initcall+0xa1/0x390\\n    do_init_module+0x2df/0x840\\n  Freed by task 90:\\n    kfree+0x131/0x3c0\\n    trusted_tpm_exit+0x59/0xa0 [trusted]\\n    __do_sys_delete_module+0x346/0x510\\n\\nMove unregister_key_type() before releasing either resource. This stops\\nnew lookups and waits for in-flight key operations to finish before the\\nbackend state is destroyed.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.111\", \"versionStartIncluding\": \"5.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.50\", \"versionStartIncluding\": \"5.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2.4\", \"versionStartIncluding\": \"5.1\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.3\", \"versionStartIncluding\": \"5.1\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-10-19T08:52:16.774Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-89763\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T08:52:16.774Z\", \"dateReserved\": \"2026-09-11T19:38:34.764Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-09-11T19:47:04.352Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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