{"id":"CVE-2026-53173","summary":"accel/ethosu: fix OOB write in ethosu_gem_cmdstream_copy_and_validate()","details":"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 \u003c 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.","modified":"2026-07-08T08:07:23.538616916Z","published":"2026-06-25T08:38:50.709Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53173.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/c0837b9cf6eabbad8b8cbddaff1a46a6d0a2e29d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/db6cb3e35cebf487f9a78ebd4cfa4b83708ff40d"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53173.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-53173"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5a5e9c0228e613f0ef2a58b9782d7c0ea8f1e58b"},{"fixed":"db6cb3e35cebf487f9a78ebd4cfa4b83708ff40d"},{"fixed":"c0837b9cf6eabbad8b8cbddaff1a46a6d0a2e29d"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53173.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.13"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53173.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}