{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89763", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.764Z", "datePublished": "2026-09-11T19:47:04.352Z", "dateUpdated": "2026-09-11T19:47:04.352Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-09-11T19:47:04.352Z"}, "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(&chip->dev) 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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["security/keys/trusted-keys/trusted_tpm1.c"], "versions": [{"version": "0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400", "lessThan": "753c978f2400f9783eb524842a975d3ac950d511", "status": "affected", "versionType": "git"}, {"version": "0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400", "lessThan": "2f7541afbc57fe9d26769a22c31d8ce8790c9a19", "status": "affected", "versionType": "git"}, {"version": "0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400", "lessThan": "5e2d672280d97d83de43031d93761b12dadd7b8a", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["security/keys/trusted-keys/trusted_tpm1.c"], "versions": [{"version": "5.1", "status": "affected"}, {"version": "0", "lessThan": "5.1", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3-rc1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "6.18.50"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "7.3-rc1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/753c978f2400f9783eb524842a975d3ac950d511"}, {"url": "https://git.kernel.org/stable/c/2f7541afbc57fe9d26769a22c31d8ce8790c9a19"}, {"url": "https://git.kernel.org/stable/c/5e2d672280d97d83de43031d93761b12dadd7b8a"}], "title": "KEYS: trusted: Fix TPM teardown ordering", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["security/keys/trusted-keys/trusted_tpm1.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "753c978f2400f9783eb524842a975d3ac950d511", "status": "affected", "version": "0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400", "versionType": "git"}, {"lessThan": "2f7541afbc57fe9d26769a22c31d8ce8790c9a19", "status": "affected", "version": "0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400", "versionType": "git"}, {"lessThan": "5e2d672280d97d83de43031d93761b12dadd7b8a", "status": "affected", "version": "0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["security/keys/trusted-keys/trusted_tpm1.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.1"}, {"lessThan": "5.1", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.50", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3-rc1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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(&chip->dev) 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."}], "id": "CVE-2026-89763", "lastModified": "2026-09-11T20:20:07.523", "metrics": {}, "published": "2026-09-11T20:20:07.523", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2f7541afbc57fe9d26769a22c31d8ce8790c9a19"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/5e2d672280d97d83de43031d93761b12dadd7b8a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/753c978f2400f9783eb524842a975d3ac950d511"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: Use-after-free in TPM trusted keys due to incorrect teardown ordering", "id": "2532156", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532156"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:H/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A flaw was found in the Linux kernel's Trusted Platform Module (TPM) trusted keys subsystem. An incorrect teardown ordering during the exit process of trusted TPM keys can lead to a race condition. This allows a local attacker to potentially dereference a freed memory region, resulting in a use-after-free vulnerability. Successful exploitation of this flaw could lead to system instability, a denial of service (DoS), or potentially arbitrary code execution."], "name": "CVE-2026-89763", "public_date": "2026-09-11T19:47:04Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89763\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89763\nhttps://git.kernel.org/stable/c/2f7541afbc57fe9d26769a22c31d8ce8790c9a19\nhttps://git.kernel.org/stable/c/5e2d672280d97d83de43031d93761b12dadd7b8a\nhttps://git.kernel.org/stable/c/753c978f2400f9783eb524842a975d3ac950d511"], "threat_severity": "Moderate"}

{}