{"api_version":"1","generated_at":"2026-09-10T09:12:24+00:00","cve":"CVE-2026-80924","urls":{"html":"https://cve.report/CVE-2026-80924","api":"https://cve.report/api/cve/CVE-2026-80924.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-80924","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-80924"},"summary":{"title":"crypto: krb5 - use kfree_sensitive() for derived key buffers","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: krb5 - use kfree_sensitive() for derived key buffers\n\ncrypto_krb5_prepare_encryption() and crypto_krb5_prepare_checksum()\nfree the buffer holding the freshly derived keys with plain kfree(),\nleaving the key material behind in the freed slab object.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-09 17:17:47","updated_at":"2026-09-10 06:17:06"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.5","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","data":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.5","severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","data":{"baseScore":7.5,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","version":"3.1"}}],"references":[{"url":"https://git.kernel.org/stable/c/f7d53dd3f267e46a784f219a75072f2f400d42b9","name":"https://git.kernel.org/stable/c/f7d53dd3f267e46a784f219a75072f2f400d42b9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/91b96dc9cc250cd16751f53de525cf3442ca0962","name":"https://git.kernel.org/stable/c/91b96dc9cc250cd16751f53de525cf3442ca0962","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/731a5b6fb4c1705f9405d9029dd64ea81e336207","name":"https://git.kernel.org/stable/c/731a5b6fb4c1705f9405d9029dd64ea81e336207","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/a1bf79365794783b19f5b09e8a23f7ee311e8931","name":"https://git.kernel.org/stable/c/a1bf79365794783b19f5b09e8a23f7ee311e8931","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-80924","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-80924","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3936f02bf2d3308a7359dd37dd96cd60603d8170 731a5b6fb4c1705f9405d9029dd64ea81e336207 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3936f02bf2d3308a7359dd37dd96cd60603d8170 91b96dc9cc250cd16751f53de525cf3442ca0962 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3936f02bf2d3308a7359dd37dd96cd60603d8170 a1bf79365794783b19f5b09e8a23f7ee311e8931 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3936f02bf2d3308a7359dd37dd96cd60603d8170 f7d53dd3f267e46a784f219a75072f2f400d42b9 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.15","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.15 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.49 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.13 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.3 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["crypto/krb5/krb5_api.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"731a5b6fb4c1705f9405d9029dd64ea81e336207","status":"affected","version":"3936f02bf2d3308a7359dd37dd96cd60603d8170","versionType":"git"},{"lessThan":"91b96dc9cc250cd16751f53de525cf3442ca0962","status":"affected","version":"3936f02bf2d3308a7359dd37dd96cd60603d8170","versionType":"git"},{"lessThan":"a1bf79365794783b19f5b09e8a23f7ee311e8931","status":"affected","version":"3936f02bf2d3308a7359dd37dd96cd60603d8170","versionType":"git"},{"lessThan":"f7d53dd3f267e46a784f219a75072f2f400d42b9","status":"affected","version":"3936f02bf2d3308a7359dd37dd96cd60603d8170","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["crypto/krb5/krb5_api.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.15"},{"lessThan":"6.15","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.49","versionType":"semver"},{"lessThanOrEqual":"7.1.*","status":"unaffected","version":"7.1.13","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.3","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.49","versionStartIncluding":"6.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1.13","versionStartIncluding":"6.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.3","versionStartIncluding":"6.15","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"6.15","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: krb5 - use kfree_sensitive() for derived key buffers\n\ncrypto_krb5_prepare_encryption() and crypto_krb5_prepare_checksum()\nfree the buffer holding the freshly derived keys with plain kfree(),\nleaving the key material behind in the freed slab object."}],"metrics":[{"cvssV3_1":{"baseScore":7.5,"baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","version":"3.1"},"scenarios":[{"lang":"en","value":"AV:N - crypto_krb5_prepare_encryption() and crypto_krb5_prepare_checksum() run from nfsd RPCSEC_GSS on TCP/2049, from in-kernel RxGK handshake processing of remote RESPONSE packets (rxgk_extract_token/rxgk_set_up_token_cipher), and from Ceph/AFS network-filesystem security, so a remote peer can cause derived Kerberos keys to be left in freed slab.\nAC:L - Each prepare path derives Ke/Ki/Kc into a kmalloc buffer then frees it with plain kfree(); the leftover is deterministic on every GSS/RxGK/Ceph context setup, with no race or attacker-uncontrollable memory layout required to leave the keys in the slab.\nPR:N - RxGK token-cipher setup runs while decrypting the authentication token, before the token or authenticator is verified, and nfsd RPCSEC_GSS INIT is the authentication handshake; a network peer needs no local Linux account or capability to drive these pre-auth paths.\nUI:N - A Kerberos NFS server or RxRPC/AFS endpoint automatically processes incoming GSS/RxGK handshake packets; no victim mount, click, or other interactive action is required at exploit time.\nS:U - Leftover keys remain in host-kernel slab; this is ordinary kernel information disclosure within the same security authority, not a VM escape, IOMMU bypass, or sandbox breakout.\nC:H - The freed buffers hold complete derived Kerberos encryption and integrity keys (Ke/Ki/Kc, up to 32-byte AES-256 material). Recovering them from reused slab yields full session-key disclosure for NFS, AFS, Ceph, or RxGK traffic.\nI:N - The bug only fails to wipe key material before kfree(); it does not corrupt kernel memory, provide a write primitive, or hijack control flow.\nA:N - Replacing kfree() with kfree_sensitive() does not affect control flow; the plain kfree() path does not oops, deadlock, leak allocator objects, or otherwise impact availability."}]}],"providerMetadata":{"dateUpdated":"2026-09-10T05:50:23.589Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/731a5b6fb4c1705f9405d9029dd64ea81e336207"},{"url":"https://git.kernel.org/stable/c/91b96dc9cc250cd16751f53de525cf3442ca0962"},{"url":"https://git.kernel.org/stable/c/a1bf79365794783b19f5b09e8a23f7ee311e8931"},{"url":"https://git.kernel.org/stable/c/f7d53dd3f267e46a784f219a75072f2f400d42b9"}],"title":"crypto: krb5 - use kfree_sensitive() for derived key buffers","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-80924","datePublished":"2026-09-09T16:19:44.150Z","dateReserved":"2026-08-26T14:34:25.802Z","dateUpdated":"2026-09-10T05:50:23.589Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-09 17:17:47","lastModifiedDate":"2026-09-10 06:17:06","problem_types":[],"metrics":{"cvssMetricV31":[{"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE"},"exploitabilityScore":3.9,"impactScore":3.6}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"80924","Ordinal":"1","Title":"crypto: krb5 - use kfree_sensitive() for derived key buffers","CVE":"CVE-2026-80924","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"80924","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: krb5 - use kfree_sensitive() for derived key buffers\n\ncrypto_krb5_prepare_encryption() and crypto_krb5_prepare_checksum()\nfree the buffer holding the freshly derived keys with plain kfree(),\nleaving the key material behind in the freed slab object.","Type":"Description","Title":"crypto: krb5 - use kfree_sensitive() for derived key buffers"}]}}}