{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-37778", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T04:51:23.940Z", "datePublished": "2025-05-01T13:07:16.472Z", "dateUpdated": "2026-08-05T11:57:29.622Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:57:29.622Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: Fix dangling pointer in krb_authenticate\n\nkrb_authenticate frees sess->user and does not set the pointer\nto NULL. It calls ksmbd_krb5_authenticate to reinitialise\nsess->user but that function may return without doing so. If\nthat happens then smb2_sess_setup, which calls krb_authenticate,\nwill be accessing free'd memory when it later uses sess->user." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "value": "AV:N - ksmbd is the in-kernel SMB server listening on TCP port 445; the vulnerable krb5_authenticate path is reached by processing an attacker-supplied SMB2 SESSION_SETUP request from a remote client.\nAC:L - The attacker deterministically forces the dangling pointer by sending a Kerberos SPNEGO blob that ksmbd_krb5_authenticate rejects before reinitializing sess->user; no race or uncontrolled condition is involved, and Kerberos-enabled ksmbd is a normal AD deployment.\nPR:N - In the most severe reasonable deployment (guest access enabled), the attacker establishes a VALID session with no credentials, then re-authenticates with a failing Kerberos blob; the failing krb5 exchange itself needs no valid credentials, so no privileges are required.\nUI:N - The entire attack is driven by the remote client sending crafted SMB2 packets; no action by any local user or victim is needed.\nS:U - The use-after-free and double-free corrupt kernel heap state within the kernel's own security authority, without crossing into a separate security scope such as a VM or IOMMU boundary.\nC:H - The dangling sess->user is read after being freed and its slab slot can be reallocated with attacker-controlled contents, yielding a use-after-free read primitive over kernel memory.\nI:H - The double-free plus freeing of pointer fields (name/passkey/sgid) read from a reallocatable freed object provides a controlled-free/heap-corruption primitive that can be leveraged into arbitrary write and control-flow hijack.\nA:H - The use-after-free and double-free readily cause slab corruption and a kernel oops/panic, taking down the system." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/smb/server/smb2pdu.c" ], "versions": [ { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "b61f04d5d73c53d183019bafe22fb700a739bac5", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "d5b554bc8d554ed6ddf443d3db2fad9f665cec10", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "1db2451de23e98bc864c6a6e52aa0d82c91cb325", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "6e30c0e10210c714f3d4453dc258d4abcc70364e", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "e83e39a5f6a01a81411a4558a59a10f87aa88dd6", "status": "affected", "versionType": "git" }, { "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "1e440d5b25b7efccb3defe542a73c51005799a5f", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/smb/server/smb2pdu.c" ], "versions": [ { "version": "5.15", "status": "affected" }, { "version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.203", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.135", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.88", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.25", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.14.4", "lessThanOrEqual": "6.14.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.15", "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": "5.15", "versionEndExcluding": "5.15.203" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.1.135" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.6.88" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.12.25" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.14.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.15" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/b61f04d5d73c53d183019bafe22fb700a739bac5" }, { "url": "https://git.kernel.org/stable/c/d5b554bc8d554ed6ddf443d3db2fad9f665cec10" }, { "url": "https://git.kernel.org/stable/c/1db2451de23e98bc864c6a6e52aa0d82c91cb325" }, { "url": "https://git.kernel.org/stable/c/6e30c0e10210c714f3d4453dc258d4abcc70364e" }, { "url": "https://git.kernel.org/stable/c/e83e39a5f6a01a81411a4558a59a10f87aa88dd6" }, { "url": "https://git.kernel.org/stable/c/1e440d5b25b7efccb3defe542a73c51005799a5f" } ], "title": "ksmbd: Fix dangling pointer in krb_authenticate", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T19:54:55.466Z" } } ] } }