180 lines
10 KiB
JSON
180 lines
10 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-74452",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-08-15T05:44:03.899Z",
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"datePublished": "2026-08-15T12:26:56.331Z",
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"dateUpdated": "2026-08-17T05:47:23.139Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-17T05:47:23.139Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/gpu/drm/panthor/panthor_fw.c"
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],
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"versions": [
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{
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"version": "2718d91816eeed03c09c8abe872e45f59078768c",
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"lessThan": "0e57165ca025a67d8dfd17efd2765fdd4925fdab",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "2718d91816eeed03c09c8abe872e45f59078768c",
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"lessThan": "2a761b9be5863e1d26a584f0c2d1e114a684ed9a",
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"status": "affected",
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"lessThan": "a3caaa06809248b996254be5b47e10804a3494e2",
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"status": "affected",
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/gpu/drm/panthor/panthor_fw.c"
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],
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"versions": [
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{
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"version": "6.10",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.10",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.103",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.44",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.1.8",
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"lessThanOrEqual": "7.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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"versionStartIncluding": "6.10",
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"versionEndExcluding": "6.12.103"
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]
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/0e57165ca025a67d8dfd17efd2765fdd4925fdab"
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},
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{
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"url": "https://git.kernel.org/stable/c/2a761b9be5863e1d26a584f0c2d1e114a684ed9a"
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},
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{
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"url": "https://git.kernel.org/stable/c/7f4674d986c15c74327cb6ac6e2e2afecf061e04"
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},
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{
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"url": "https://git.kernel.org/stable/c/a3caaa06809248b996254be5b47e10804a3494e2"
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}
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],
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"title": "drm/panthor: reject firmware sections with oversized data",
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