CVE-2026-89763

{"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": "2026-10-30T12:33:00.263Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:33:00.263Z"}, "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."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "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's 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'd 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": [{"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": "b254cdadbcb6bdd0daf7391d63b3b97b2bec1ad9", "status": "affected", "versionType": "git"}, {"version": "0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400", "lessThan": "c96518231608bbf9568f539aadb20a8e366b54c7", "status": "affected", "versionType": "git"}, {"version": "0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400", "lessThan": "6564808189c9a1e682ee7b5e70f5f1c73c89c3a4", "status": "affected", "versionType": "git"}, {"version": "0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400", "lessThan": "81dfc6c665547a4e41721b6716f894f263a5e03f", "status": "affected", "versionType": "git"}, {"version": "0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400", "lessThan": "3d67b4acbfc7af331d887a8efc04bef6573b8a7a", "status": "affected", "versionType": "git"}, {"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": "5.10.273", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.224", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.111", "lessThanOrEqual": "6.12.*", "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", "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": "5.10.273"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "5.15.224"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "6.1.191"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "6.6.160"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "6.12.111"}, {"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"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/b254cdadbcb6bdd0daf7391d63b3b97b2bec1ad9"}, {"url": "https://git.kernel.org/stable/c/c96518231608bbf9568f539aadb20a8e366b54c7"}, {"url": "https://git.kernel.org/stable/c/6564808189c9a1e682ee7b5e70f5f1c73c89c3a4"}, {"url": "https://git.kernel.org/stable/c/81dfc6c665547a4e41721b6716f894f263a5e03f"}, {"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"}], "title": "KEYS: trusted: Fix TPM teardown ordering", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-89763", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T19:26:34.436196Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:36:59.769Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-89763", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T19:26:34.436196Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:26:35.559Z"}}], "cna": {"title": "KEYS: trusted: Fix TPM teardown ordering", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.8, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}, "scenarios": [{"lang": "en", "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's 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'd 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(&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."}], "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"}, "dataVersion": "5.2"}

{"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": "b254cdadbcb6bdd0daf7391d63b3b97b2bec1ad9", "status": "affected", "version": "0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400", "versionType": "git"}, {"lessThan": "c96518231608bbf9568f539aadb20a8e366b54c7", "status": "affected", "version": "0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400", "versionType": "git"}, {"lessThan": "6564808189c9a1e682ee7b5e70f5f1c73c89c3a4", "status": "affected", "version": "0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400", "versionType": "git"}, {"lessThan": "81dfc6c665547a4e41721b6716f894f263a5e03f", "status": "affected", "version": "0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400", "versionType": "git"}, {"lessThan": "3d67b4acbfc7af331d887a8efc04bef6573b8a7a", "status": "affected", "version": "0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400", "versionType": "git"}, {"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": "5.10.*", "status": "unaffected", "version": "5.10.273", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.224", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.191", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.160", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.111", "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", "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": "2026-10-30T13:20:28.847", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-89763", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T19:26:34.436196Z", "version": "2.0.3"}}]}, "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/3d67b4acbfc7af331d887a8efc04bef6573b8a7a"}, {"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/6564808189c9a1e682ee7b5e70f5f1c73c89c3a4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/753c978f2400f9783eb524842a975d3ac950d511"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/81dfc6c665547a4e41721b6716f894f263a5e03f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b254cdadbcb6bdd0daf7391d63b3b97b2bec1ad9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c96518231608bbf9568f539aadb20a8e366b54c7"}], "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"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400,753c978f2400f9783eb524842a975d3ac950d511)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400,2f7541afbc57fe9d26769a22c31d8ce8790c9a19)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[0b6cf6b97b7ef1fa3c7fefab0cac897a1c4a3400,5e2d672280d97d83de43031d93761b12dadd7b8a)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "5.1"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.1)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.50,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.4,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-12T05:15:06.923747+00:00", "updated": "2026-09-15T19:15:16.157829+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}