CVE-2024-26729

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This could lead to a null pointer\ndereference if 'dc_dmub_srv' is null. The fix is to check if\n'dc_dmub_srv' is null before dereferencing it.\n\nThus moving the null checks for 'dc_dmub_srv' to the beginning of the\nfunctions to ensure that 'dc_dmub_srv' is not null when it is\ndereferenced.\n\nFound by smatch & thus fixing the below:\ndrivers/gpu/drm/amd/amdgpu/../display/dc/dc_dmub_srv.c:133 dc_dmub_srv_cmd_list_queue_execute() warn: variable dereferenced before check 'dc_dmub_srv' (see line 128)\ndrivers/gpu/drm/amd/amdgpu/../display/dc/dc_dmub_srv.c:1167 dc_dmub_srv_is_hw_pwr_up() warn: variable dereferenced before check 'dc_dmub_srv' (see line 1164)"}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drm/amd/display: corrige una posible desreferencia de puntero nulo en dc_dmub_srv. Corrige posibles advertencias de desreferencia de puntero nulo en las funciones dc_dmub_srv_cmd_list_queue_execute() y dc_dmub_srv_is_hw_pwr_up(). En ambas funciones, se estaba desreferenciando la variable 'dc_dmub_srv' antes de verificar si era nula. Esto podr\u00eda provocar una desreferencia del puntero nulo si 'dc_dmub_srv' es nulo. La soluci\u00f3n es comprobar si 'dc_dmub_srv' es nulo antes de eliminar la referencia a \u00e9l. Por lo tanto, se mueven las comprobaciones nulas de 'dc_dmub_srv' al comienzo de las funciones para garantizar que 'dc_dmub_srv' no sea nulo cuando se desreferencia. Encontrado por smatch y arreglando as\u00ed lo siguiente: drivers/gpu/drm/amd/amdgpu/../display/dc/dc_dmub_srv.c:133 dc_dmub_srv_cmd_list_queue_execute() advertencia: variable desreferenciada antes de verificar 'dc_dmub_srv' (ver l\u00ednea 128) drivers/ gpu/drm/amd/amdgpu/../display/dc/dc_dmub_srv.c:1167 dc_dmub_srv_is_hw_pwr_up() advertencia: variable desreferenciada antes de verificar 'dc_dmub_srv' (ver l\u00ednea 1164)"}], "id": "CVE-2024-26729", "lastModified": "2026-06-17T07:18:11.680", "metrics": {"cvssMetricV31": [{"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-2024-26729", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-04-03T18:06:25.283225Z", "version": "2.0.3"}}]}, "published": "2024-04-03T17:15:50.820", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/351080ba3414c96afff0f1338b4aeb2983195b80"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d2b48f340d9e4a8fbeb1cdc84cd8da6ad143a907"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/351080ba3414c96afff0f1338b4aeb2983195b80"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d2b48f340d9e4a8fbeb1cdc84cd8da6ad143a907"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: drm/amd/display: Fix potential null pointer dereference in dc_dmub_srv", "id": "2273256", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2273256"}, "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:\ndrm/amd/display: Fix potential null pointer dereference in dc_dmub_srv\nFixes potential null pointer dereference warnings in the\ndc_dmub_srv_cmd_list_queue_execute() and dc_dmub_srv_is_hw_pwr_up()\nfunctions.\nIn both functions, the 'dc_dmub_srv' variable was being dereferenced\nbefore it was checked for null. This could lead to a null pointer\ndereference if 'dc_dmub_srv' is null. The fix is to check if\n'dc_dmub_srv' is null before dereferencing it.\nThus moving the null checks for 'dc_dmub_srv' to the beginning of the\nfunctions to ensure that 'dc_dmub_srv' is not null when it is\ndereferenced.\nFound by smatch & thus fixing the below:\ndrivers/gpu/drm/amd/amdgpu/../display/dc/dc_dmub_srv.c:133 dc_dmub_srv_cmd_list_queue_execute() warn: variable dereferenced before check 'dc_dmub_srv' (see line 128)\ndrivers/gpu/drm/amd/amdgpu/../display/dc/dc_dmub_srv.c:1167 dc_dmub_srv_is_hw_pwr_up() warn: variable dereferenced before check 'dc_dmub_srv' (see line 1164)", "A vulnerability was found in the Linux kernel. This issue occurs in the dc_dmub_srv_cmd_list_queue_execute() and dc_dmub_srv_is_hw_pwr_up() functions, where the dc_dmub_srv variable is dereferenced before being checked for NULL. This could lead to a NULL pointer dereference, causing memory corruption or crashes."], "name": "CVE-2024-26729", "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": "2024-04-03T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-26729\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-26729\nhttps://lore.kernel.org/linux-cve-announce/2024040357-CVE-2024-26729-2f3e@gregkh/T"], "statement": "Red Hat Enterprise Linux 8 and 9 are not affected by this vulnerability.", "threat_severity": "Moderate"}

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