CVE-2025-37778

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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", 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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": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "b61f04d5d73c53d183019bafe22fb700a739bac5", "versionType": "git"}, {"status": "affected", "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "d5b554bc8d554ed6ddf443d3db2fad9f665cec10", "versionType": "git"}, {"status": "affected", "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "1db2451de23e98bc864c6a6e52aa0d82c91cb325", "versionType": "git"}, {"status": "affected", "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "6e30c0e10210c714f3d4453dc258d4abcc70364e", "versionType": "git"}, {"status": "affected", "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "e83e39a5f6a01a81411a4558a59a10f87aa88dd6", "versionType": "git"}, {"status": "affected", "version": "0626e6641f6b467447c81dd7678a69c66f7746cf", "lessThan": "1e440d5b25b7efccb3defe542a73c51005799a5f", "versionType": "git"}], "programFiles": ["fs/smb/server/smb2pdu.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "5.15"}, {"status": "unaffected", "version": "0", "lessThan": "5.15", "versionType": "semver"}, {"status": "unaffected", "version": "5.15.203", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.135", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.88", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.25", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.14.4", "versionType": "semver", "lessThanOrEqual": "6.14.*"}, {"status": "unaffected", "version": "6.15", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/smb/server/smb2pdu.c"], "defaultStatus": "affected"}], "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"}], "x_generator": {"engine": "bippy-1.2.0"}, "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. 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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."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ksmbd: Se corrige el puntero colgante en krb_authenticate. krb_authenticate libera sess->user y no establece el puntero en NULL. Llama a ksmbd_krb5_authenticate para reinicializar sess->user, pero es posible que esta funci\u00f3n no lo retorne. Si esto ocurre, smb2_sess_setup, que llama a krb_authenticate, acceder\u00e1 a la memoria liberada cuando utilice posteriormente sess->user."}], "id": "CVE-2025-37778", "lastModified": "2026-10-15T22:18:17.730", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"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": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2025-37778", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-15T21:45:08.250417Z", "version": "2.0.3"}}]}, "published": "2025-05-01T14:15:41.617", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1db2451de23e98bc864c6a6e52aa0d82c91cb325"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1e440d5b25b7efccb3defe542a73c51005799a5f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/6e30c0e10210c714f3d4453dc258d4abcc70364e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b61f04d5d73c53d183019bafe22fb700a739bac5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d5b554bc8d554ed6ddf443d3db2fad9f665cec10"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e83e39a5f6a01a81411a4558a59a10f87aa88dd6"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ksmbd: Fix dangling pointer in krb_authenticate", "id": "2363331", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2363331"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nksmbd: Fix dangling pointer in krb_authenticate\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."], "name": "CVE-2025-37778", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-05-01T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-37778\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-37778\nhttps://lore.kernel.org/linux-cve-announce/2025050116-CVE-2025-37778-7202@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2026-04-20T15:45:10.394873+00:00", "updated": "2026-08-05T03:30:06.907808+00:00", "vendors": []}