CVE-2024-50215

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So it's better to nullify it after release on\nerror path in order to avoid double free later in nvmet_destroy_auth().\n\nFound by Linux Verification Center (linuxtesting.org) with Svace."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.1, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - `nvmet_setup_dhgroup()` executes on behalf of remote NVMe-oF fabric commands \u2014 the admin Connect command (`nvmet_execute_admin_connect()`) and the AUTH_Send DH-HMAC-CHAP NEGOTIATE restart \u2014 delivered by nvmet-tcp on TCP/4420 (or RDMA/FC) from an arbitrary remote initiator. No local access to the target is needed to drive the vulnerable function.\nAC:H - Two preconditions lie entirely outside the attacker's control: `ctrl->dh_gid` must diverge from `host->dhchap_dhgroup_id` (the negotiate loop can only re-assign `dh_gid` to its existing value, so this requires an administrator changing `dhchap_dhgroup` via configfs between two setups), and `crypto_kpp_set_secret()` must fail, which happens only on a small GFP_KERNEL/MPI allocation failure or default-RNG failure that the kernel does not produce without OOM-killing first.\nPR:N - The code path is the authentication setup itself and runs before DH-HMAC-CHAP completes (`sq->authenticated == false`); the only credential involved is the host NQN, a non-secret identifier the attacker chooses in the Connect payload. No prior authentication or account on the target is required.\nUI:N - No victim action participates in the attack \u2014 the attacker alone issues Connect and AUTH_Send commands and later disconnects to drive `nvmet_ctrl_free()` \u2192 `nvmet_destroy_auth()`. The DH-group configfs setting is pre-existing system configuration, not user interaction.\nS:U - The double free corrupts kernel slab state within the kernel's own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - A double free of the 256\u20131024 byte `ctrl->dh_key` in a general-purpose kmalloc cache lets the same slab object be handed out twice; with the heap grooming the remote peer already has on the target (`kmalloc(tl, GFP_KERNEL)` with attacker-chosen `tl` in `nvmet_execute_auth_send()`), this yields a UAF-style read primitive over adjacent/overlapping kernel objects, including the DH private key material itself.\nI:H - The same aliased-allocation primitive gives an attacker-controlled write into an object another kernel subsystem believes it owns, corrupting SLUB freelist metadata and enabling control-flow hijacking in the classic double-free exploitation pattern.\nA:H - Even unexploited, the second `kfree_sensitive()` on the dangling pointer trips SLUB double-free detection (BUG/panic with `slub_debug` or `panic_on_oops`) or corrupts the freelist into a later fatal oops, taking down the storage target."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/nvme/target/auth.c"], "versions": [{"version": "7a277c37d3522e9b2777d762bbbcecafae2b1f8d", "lessThan": "c94e965f766321641ec38e4eece9ce8884543244", "status": "affected", "versionType": "git"}, {"version": "7a277c37d3522e9b2777d762bbbcecafae2b1f8d", "lessThan": "c60af16e1d6cc2237d58336546d6adfc067b6b8f", "status": "affected", "versionType": "git"}, {"version": "7a277c37d3522e9b2777d762bbbcecafae2b1f8d", "lessThan": "e61bd51e44409495d75847e9230736593e4c8710", "status": "affected", "versionType": "git"}, {"version": "7a277c37d3522e9b2777d762bbbcecafae2b1f8d", "lessThan": "d2f551b1f72b4c508ab9298419f6feadc3b5d791", "status": "affected", "versionType": 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{"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T22:27:06.690Z"}}]}}

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So it's better to nullify it after release on\nerror path in order to avoid double free later in nvmet_destroy_auth().\n\nFound by Linux Verification Center (linuxtesting.org) with Svace."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nvmet-auth: asignar dh_key a NULL despu\u00e9s de que kfree_sensitive ctrl->dh_key se pudiera usar en varias llamadas a nvmet_setup_dhgroup() para el mismo controlador. Por lo tanto, es mejor anularlo despu\u00e9s de la liberaci\u00f3n en la ruta de error para evitar una doble liberaci\u00f3n m\u00e1s adelante en nvmet_destroy_auth(). Encontrado por Linux Verification Center (linuxtesting.org) con Svace."}], "id": "CVE-2024-50215", "lastModified": "2026-08-04T11:21:33.563", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.2, "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"}, {"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": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-50215", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2025-10-01T20:17:09.200980Z", "version": "2.0.3"}}]}, "published": "2024-11-09T11:15:06.893", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c60af16e1d6cc2237d58336546d6adfc067b6b8f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c94e965f766321641ec38e4eece9ce8884543244"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d2f551b1f72b4c508ab9298419f6feadc3b5d791"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e61bd51e44409495d75847e9230736593e4c8710"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-415"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-415"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"affected_release": [{"advisory": "RHSA-2025:6966", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-570.12.1.el9_6", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-05-13T00:00:00Z"}, {"advisory": "RHSA-2025:6966", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-570.12.1.el9_6", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-05-13T00:00:00Z"}], "bugzilla": {"description": "kernel: nvmet-auth: assign dh_key to NULL after kfree_sensitive", "id": "2324875", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2324875"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H", "status": "verified"}, "cwe": "CWE-415", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnvmet-auth: assign dh_key to NULL after kfree_sensitive\nctrl->dh_key might be used across multiple calls to nvmet_setup_dhgroup()\nfor the same controller. So it's better to nullify it after release on\nerror path in order to avoid double free later in nvmet_destroy_auth().\nFound by Linux Verification Center (linuxtesting.org) with Svace."], "name": "CVE-2024-50215", "package_state": [{"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": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-11-09T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-50215\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-50215\nhttps://lore.kernel.org/linux-cve-announce/2024110924-CVE-2024-50215-0155@gregkh/T"], "statement": "This issue is considered to be a moderate impact flaw, as the exploitation for this will need an ADMIN (or ROOT) privilege (PR:H).", "threat_severity": "Moderate"}

{}