199 lines
9.8 KiB
JSON
199 lines
9.8 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2021-46922",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-02-25T13:45:52.719Z",
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"datePublished": "2024-02-27T09:36:27.145Z",
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"dateUpdated": "2026-08-05T08:45:06.331Z"
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},
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"containers": {
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"cna": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T08:45:06.331Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKEYS: trusted: Fix TPM reservation for seal/unseal\n\nThe original patch 8c657a0590de (\"KEYS: trusted: Reserve TPM for seal\nand unseal operations\") was correct on the mailing list:\n\nhttps://lore.kernel.org/linux-integrity/20210128235621.127925-4-jarkko@kernel.org/\n\nBut somehow got rebased so that the tpm_try_get_ops() in\ntpm2_seal_trusted() got lost. This causes an imbalanced put of the\nTPM ops and causes oopses on TIS based hardware.\n\nThis fix puts back the lost tpm_try_get_ops()"
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The bug is reached via the local add_key/keyctl syscall path (trusted_instantiate → trusted_tpm_seal → tpm2_seal_trusted), not via network packets or physical device I/O.\nAC:L - An attacker can reliably trigger the imbalanced tpm_put_ops by creating a TPM2 trusted key (e.g. keyctl add trusted ... \"new 32\"); no race or attacker-uncontrollable condition is required, and put runs even when the TPM command fails.\nPR:L - Creating a trusted key requires only an unprivileged local account with write access to a keyring the caller possesses (documented as keyctl add trusted ... @u); there is no capability check in the trusted-key instantiate path.\nUI:N - The attacker invokes add_key/keyctl directly; no separate victim action is required.\nS:U - Impact is confined to the host kernel privilege domain (lock/refcount corruption and potential tpm_chip UAF); it does not cross a VM, IOMMU, or other security authority boundary.\nC:H - tpm_put_ops without a matching tpm_try_get_ops drops a real device reference via put_device and can free the still-referenced tpm_chip, yielding a heap use-after-free that can be leveraged for arbitrary memory disclosure.\nI:H - The same premature free of tpm_chip (which contains ops function pointers), plus unlocking an unheld tpm_mutex and up_read of ops_sem, enables heap reuse and control-flow hijacking primitives under UAF guidance.\nA:H - The fix commit documents kernel oopses on TIS hardware from the imbalanced put, and the resulting UAF/lock corruption can crash or destabilize the kernel."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"security/keys/trusted-keys/trusted_tpm2.c"
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],
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{
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{
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"security/keys/trusted-keys/trusted_tpm2.c"
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],
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"versions": [
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{
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"version": "5.10.20",
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"lessThan": "5.10.33",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "5.11.3",
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"lessThan": "5.11.17",
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"status": "affected",
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}
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],
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"cpeApplicability": [
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.10.20",
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"references": [
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"url": "https://git.kernel.org/stable/c/bf84ef2dd2ccdcd8f2658476d34b51455f970ce4"
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{
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"url": "https://git.kernel.org/stable/c/39c8d760d44cb3fa0d67e8cd505df81cf4d80999"
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},
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"url": "https://git.kernel.org/stable/c/9d5171eab462a63e2fbebfccf6026e92be018f20"
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}
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],
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"title": "KEYS: trusted: Fix TPM reservation for seal/unseal",
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"x_generator": {
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"engine": "bippy-1.2.0"
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"adp": [
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"type": "ssvc",
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"content": {
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"timestamp": "2024-07-25T16:00:18.491671Z",
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"id": "CVE-2021-46922",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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"title": "CISA ADP Vulnrichment",
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