{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-74452", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.899Z", "datePublished": "2026-08-15T12:26:56.331Z", "dateUpdated": "2026-08-17T05:47:23.139Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:47:23.139Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/panthor: reject firmware sections with oversized data\n\nIn panthor_fw_load_section_entry(), the data size to copy is calculated\nwithout validating it against the allocated section_size:\n\n section->data.size = hdr.data.end - hdr.data.start;\n\nIf a crafted firmware sets data.size larger than the allocated memory,\nthis could cause a heap buffer overflow in panthor_fw_init_section_mem()\n\n memcpy(section->mem->kmap, section->data.buf, section->data.size);\n\nAdditionally, if the section->data.size exceeds the BO size, could this\nmemset underflow the size calculation, leading to a massive out-of-bounds\nzeroing of kernel memory?\n\n memset(section->mem->kmap + section->data.size, 0,\n panthor_kernel_bo_size(section->mem) - section->data.size);\n\nReject section entries whose initial data is larger than the section size." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The overflow is reached only when panthor_fw_load() parses mali_csffw.bin from the local firmware search path during platform probe (panthor_probe→panthor_fw_init→panthor_fw_load_section_entry→panthor_fw_init_section_mem); no network, DRM ioctl, or /dev/dri/renderD* path feeds attacker-controlled firmware headers.\nAC:L - An attacker fully controls firmware section header fields (data.start/end versus va.start/end); once a malicious blob is in the firmware path, parsing deterministically performs an oversized memcpy and, with ZERO set, an underflowed memset on every load and on GPU-reset reloads without races or uncontrollable layout.\nPR:L - The parser performs no capability or authentication checks on firmware content; on Mali CSF Android, Chromebook, and embedded deployments the GPU firmware image commonly lives on vendor/firmware partitions writable by local non-root system or vendor service accounts, sufficient to plant the crafted blob before driver probe.\nUI:N - After the malicious firmware file is in place, parsing runs automatically at driver probe or GPU-reset section reload with no separate victim action; an attacker does not need another user to open a device node or mount a filesystem to trigger the bug.\nS:U - Impact is kernel heap corruption and potential local privilege escalation within the same kernel security domain; it does not cross a VM, IOMMU, or sandbox boundary such as guest-to-host escape.\nC:H - The unchecked memcpy copies attacker-controlled firmware bytes past the allocated shmem BO mapping, and the memset length underflow can zero far beyond the buffer, giving out-of-bounds read/write primitives over adjacent kernel heap objects rather than a bounded leak.\nI:H - Heap buffer overflow plus attacker-controlled firmware content enables arbitrary kernel memory corruption; the ZERO-flag memset underflow can perform a massive out-of-bounds zero write exploitable for control-flow hijacking and local privilege escalation.\nA:H - Oversized memcpy and underflowed memset corrupt kernel heap memory and can immediately kernel oops or panic; the same corruption is re-triggered on GPU reset via panthor_reload_fw_sections(), enabling repeatable denial of service." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/gpu/drm/panthor/panthor_fw.c" ], "versions": [ { "version": "2718d91816eeed03c09c8abe872e45f59078768c", "lessThan": "0e57165ca025a67d8dfd17efd2765fdd4925fdab", "status": "affected", "versionType": "git" }, { "version": "2718d91816eeed03c09c8abe872e45f59078768c", "lessThan": "2a761b9be5863e1d26a584f0c2d1e114a684ed9a", "status": "affected", "versionType": "git" }, { "version": "2718d91816eeed03c09c8abe872e45f59078768c", "lessThan": "7f4674d986c15c74327cb6ac6e2e2afecf061e04", "status": "affected", "versionType": "git" }, { "version": "2718d91816eeed03c09c8abe872e45f59078768c", "lessThan": "a3caaa06809248b996254be5b47e10804a3494e2", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/gpu/drm/panthor/panthor_fw.c" ], "versions": [ { "version": "6.10", "status": "affected" }, { "version": "0", "lessThan": "6.10", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.103", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.44", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.8", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "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": "6.12.103" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "6.18.44" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "7.1.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.10", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/0e57165ca025a67d8dfd17efd2765fdd4925fdab" }, { "url": "https://git.kernel.org/stable/c/2a761b9be5863e1d26a584f0c2d1e114a684ed9a" }, { "url": "https://git.kernel.org/stable/c/7f4674d986c15c74327cb6ac6e2e2afecf061e04" }, { "url": "https://git.kernel.org/stable/c/a3caaa06809248b996254be5b47e10804a3494e2" } ], "title": "drm/panthor: reject firmware sections with oversized data", "x_generator": { "engine": "bippy-1.2.0" } } } }