CVE-2024-44992

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Add a check for 'rdata->server'\nto avoid NULL dereference."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - The precondition for the crash \u2014 `rdata->server` being NULL while credits are still held \u2014 is produced by SMB channel teardown paths (`cifs_chan_skip_or_disable()`, channel reconnect/disable) that are driven by the remote SMB server's responses and multichannel advertisements, so a malicious, compromised, or MITM'd SMB server reached over the network controls the trigger against a mounted client.\nAC:L - A hostile server controls both sides: it drives the reconnect/multichannel-disable that NULLs the channel and it controls response timing, so it can stall in-flight R/W subrequests to hold credits across the window at will. No memory-layout or victim-state condition outside the attacker's influence is needed.\nPR:N - A remote SMB server needs no account, credentials, or privileges on the victim client \u2014 the reconnect and channel-negotiation behaviour it abuses is part of normal connection maintenance on an established mount.\nUI:N - Against the common deployment of a persistent SMB mount (fstab/automount on servers, embedded and Android devices), the attacker acts on an already-mounted share with ordinary background readahead and writeback supplying the I/O; no victim action is required at attack time.\nS:U - The fault occurs in the CIFS client inside the kernel and its consequences stay within that same kernel's security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:N - The defect is a dereference of a NULL `server` pointer to reach `server->ops`, which faults immediately; no out-of-bounds or freed memory is read and no data is returned to the attacker.\nI:N - Nothing is written through the bad pointer \u2014 the code path faults on the read of `->ops` before any store, giving no write primitive or control-flow hijack on configurations with the standard non-zero `mmap_min_addr` and SMAP/PAN.\nA:H - The NULL dereference oopses the kernel in netfs subrequest-completion context, which is frequently a workqueue, killing writeback and rendering the mount unusable; the remote server can trigger it repeatedly."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/smb/client/file.c"], "versions": [{"version": "69c3c023af25edb5433a2db824d3e7cc328f0183", "lessThan": "fead60a6d5f84b472b928502a42c419253afe6c1", "status": "affected", "versionType": "git"}, {"version": "69c3c023af25edb5433a2db824d3e7cc328f0183", "lessThan": "74c2ab6d653b4c2354df65a7f7f2df1925a40a51", "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/client/file.c"], "versions": [{"version": "6.10", "status": "affected"}, {"version": "0", "lessThan": "6.10", "status": "unaffected", "versionType": "semver"}, {"version": "6.10.7", "lessThanOrEqual": "6.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.11", "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": "6.10", "versionEndExcluding": "6.10.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "6.11"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/fead60a6d5f84b472b928502a42c419253afe6c1"}, {"url": "https://git.kernel.org/stable/c/74c2ab6d653b4c2354df65a7f7f2df1925a40a51"}], "title": "smb/client: avoid possible NULL dereference in cifs_free_subrequest()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2024-09-04T20:19:34.019685Z", "id": "CVE-2024-44992", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-04T20:19:53.480Z"}}]}}

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Add a check for 'rdata->server'\nto avoid NULL dereference."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: smb/client: evitar posible desreferencia NULL en cifs_free_subrequest() Advertencia del verificador est\u00e1tico de Clang (scan-build): cifsglob.h:l\u00ednea 890, columna 3 El acceso al campo 'ops' da como resultado una desreferencia de un puntero nulo. El commit 519be989717c (\"cifs: Agregar un punto de seguimiento para rastrear cr\u00e9ditos involucrados en solicitudes R/W\") agrega una verificaci\u00f3n para 'rdata->server' y permite que clang lance esta advertencia sobre la desreferencia NULL. Cuando sucede 'rdata->credits.value != 0 && rdata->server == NULL', add_credits_and_wake_if() llamar\u00e1 a rdata->server->ops->add_credits(). Esto causar\u00e1 un problema de desreferencia NULL. Agregue una verificaci\u00f3n para 'rdata->server' para evitar la desreferencia NULL."}], "id": "CVE-2024-44992", "lastModified": "2026-08-04T11:20:07.747", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2024-44992", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-04T20:19:34.019685Z", "version": "2.0.3"}}]}, "published": "2024-09-04T20:15:08.207", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/74c2ab6d653b4c2354df65a7f7f2df1925a40a51"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/fead60a6d5f84b472b928502a42c419253afe6c1"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: smb/client: avoid possible NULL dereference in cifs_free_subrequest()", "id": "2309855", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2309855"}, "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"}, "cwe": "CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nsmb/client: avoid possible NULL dereference in cifs_free_subrequest()\nClang static checker (scan-build) warning:\ncifsglob.h:line 890, column 3\nAccess to field 'ops' results in a dereference of a null pointer.\nCommit 519be989717c (\"cifs: Add a tracepoint to track credits involved in\nR/W requests\") adds a check for 'rdata->server', and let clang throw this\nwarning about NULL dereference.\nWhen 'rdata->credits.value != 0 && rdata->server == NULL' happens,\nadd_credits_and_wake_if() will call rdata->server->ops->add_credits().\nThis will cause NULL dereference problem. Add a check for 'rdata->server'\nto avoid NULL dereference."], "name": "CVE-2024-44992", "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": "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": "2024-09-04T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-44992\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-44992\nhttps://lore.kernel.org/linux-cve-announce/2024090447-CVE-2024-44992-9050@gregkh/T"], "threat_severity": "Moderate"}

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