138 lines
7.9 KiB
JSON
138 lines
7.9 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-2026-53173",
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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": "2026-06-09T07:44:35.389Z",
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"datePublished": "2026-06-25T08:38:50.709Z",
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"dateUpdated": "2026-08-05T12:33:42.554Z"
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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": "2026-08-05T12:33:42.554Z"
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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\naccel/ethosu: fix OOB write in ethosu_gem_cmdstream_copy_and_validate()\n\nThe command stream parsing loop increments the index variable a second\ntime when a 64-bit command word is encountered (bit 14 set), but does\nnot re-check the loop bound before writing the second word:\n\n for (i = 0; i < size / 4; i++) {\n bocmds[i] = cmds[0];\n if (cmd & 0x4000) {\n i++;\n bocmds[i] = cmds[1]; /* unchecked */\n }\n }\n\nThe buffer bocmds is backed by a DMA allocation of exactly size bytes\nfrom drm_gem_dma_create(ddev, size), giving valid indices [0, size/4-1].\n\nWhen i == size/4 - 1 on entry to an iteration and bit 14 of cmds[0] is\nset, bocmds[size/4-1] is written in bounds, i is then incremented to\nsize/4, and bocmds[size/4] writes four bytes past the end of the\nallocation.\n\nUserspace controls both the buffer contents and the size argument via\nthe ioctl, making this a userspace-triggerable heap out-of-bounds write.\n\nFix by checking the incremented index against the buffer bound before\nthe second write and returning -EINVAL if the buffer is too small to\ncontain the extended command."
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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 vulnerable code is reached through the local DRM accel ioctl `DRM_IOCTL_ETHOSU_CMDSTREAM_BO_CREATE` on `/dev/accel/accel*`, not through network, adjacent, or physical input.\nAC:L - Userspace controls both the command stream contents and size, and can deterministically place a 64-bit command marker at the final word to trigger the unchecked second write. No race or external state is required.\nPR:L - The driver ioctl has no capability, root, master, or authentication check, but the attacker must be a local user/process able to open the accelerator device node.\nUI:N - No victim action is needed after the attacker has local device access; a single ioctl with attacker-controlled arguments reaches the vulnerable function.\nS:U - This is kernel memory corruption within the same host security authority and does not cross a VM, IOMMU, or other distinct security boundary.\nC:H - The bug is a userspace-triggered kernel heap/DMA allocation out-of-bounds write, which is defensibly exploitable as memory corruption and can lead to kernel compromise and disclosure of arbitrary kernel data.\nI:H - An out-of-bounds write of attacker-controlled command data past a kernel DMA-backed GEM allocation can corrupt adjacent memory and is treated as high-integrity-impact kernel memory corruption.\nA:H - Even without full exploitation, corrupting memory past the allocation can crash or destabilize the kernel, giving high availability impact."
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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/accel/ethosu/ethosu_gem.c"
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],
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"versions": [
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{
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"version": "5a5e9c0228e613f0ef2a58b9782d7c0ea8f1e58b",
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"lessThan": "db6cb3e35cebf487f9a78ebd4cfa4b83708ff40d",
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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": "5a5e9c0228e613f0ef2a58b9782d7c0ea8f1e58b",
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"lessThan": "c0837b9cf6eabbad8b8cbddaff1a46a6d0a2e29d",
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"status": "affected",
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"versionType": "git"
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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/accel/ethosu/ethosu_gem.c"
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],
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"versions": [
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{
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"version": "6.19",
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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": "6.19",
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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": "7.0.13",
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"lessThanOrEqual": "7.0.*",
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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",
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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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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.19",
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"versionEndExcluding": "7.0.13"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.19",
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"versionEndExcluding": "7.1"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/db6cb3e35cebf487f9a78ebd4cfa4b83708ff40d"
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},
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{
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"url": "https://git.kernel.org/stable/c/c0837b9cf6eabbad8b8cbddaff1a46a6d0a2e29d"
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}
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],
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"title": "accel/ethosu: fix OOB write in ethosu_gem_cmdstream_copy_and_validate()",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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} |