{"id":"CVE-2026-68445","title":"drm/vc4: Prevent shader BO mappings from becoming writable","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vc4: Prevent shader BO mappings from becoming writable\n\nvc4_gem_object_mmap() rejects a writable mapping of a validated shader\nBO, but leaves VM_MAYWRITE set.  User…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 463873d5701427f2964a0b4b72c45f1f14b6df87 < 4c98260a967e8536c69437b8da8eea3188cd6db8","Linux >= 463873d5701427f2964a0b4b72c45f1f14b6df87 < 9f0ee411fc2d76333d6087c5862ffa907cf7a175","Linux >= 463873d5701427f2964a0b4b72c45f1f14b6df87 < 019e6ad247f7fd038d2e009789f6d9bfcccb1ae7","Linux >= 463873d5701427f2964a0b4b72c45f1f14b6df87 < 6deaa317201851c644c431b57682e54d06b35838","Linux >= 463873d5701427f2964a0b4b72c45f1f14b6df87 < fe168ef1d232d734d9998fd74822e2e20930dfff","Linux >= 463873d5701427f2964a0b4b72c45f1f14b6df87 < 0c9e6367639548307d3f578f6943ce72c9d39087","Linux 4.5"],"published":"2026-08-12","updated":"2026-10-30","sourceUpdated":"2026-10-30T12:28:38.418Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-68445","references":[{"url":"https://git.kernel.org/stable/c/4c98260a967e8536c69437b8da8eea3188cd6db8"},{"url":"https://git.kernel.org/stable/c/9f0ee411fc2d76333d6087c5862ffa907cf7a175"},{"url":"https://git.kernel.org/stable/c/019e6ad247f7fd038d2e009789f6d9bfcccb1ae7"},{"url":"https://git.kernel.org/stable/c/6deaa317201851c644c431b57682e54d06b35838"},{"url":"https://git.kernel.org/stable/c/fe168ef1d232d734d9998fd74822e2e20930dfff"},{"url":"https://git.kernel.org/stable/c/0c9e6367639548307d3f578f6943ce72c9d39087"}],"tags":["cve.org"],"epss":0.00127,"epssPercentile":0.02367,"ingestedAt":"2026-11-05T15:02:32.467Z","slug":"CVE-2026-68445","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vc4: Prevent shader BO mappings from becoming writable\n\nvc4_gem_object_mmap() rejects a writable mapping of a validated shader\nBO, but leaves VM_MAYWRITE set.  Userspace can map the BO read-only and\nthen turn it writable with mprotect().\n\nValidated shader BOs must stay read-only: the validator checks the\ninstructions once and the GPU trusts them afterwards.  A writable\nmapping lets userspace rewrite the code after validation, bypassing the\nvalidator.\n\nClear VM_MAYWRITE on the read-only path so the mapping cannot be\nupgraded, as i915 already does for its read-only objects.\n\n## Affected\n\n- `Linux >= 463873d5701427f2964a0b4b72c45f1f14b6df87 < 4c98260a967e8536c69437b8da8eea3188cd6db8`\n- `Linux >= 463873d5701427f2964a0b4b72c45f1f14b6df87 < 9f0ee411fc2d76333d6087c5862ffa907cf7a175`\n- `Linux >= 463873d5701427f2964a0b4b72c45f1f14b6df87 < 019e6ad247f7fd038d2e009789f6d9bfcccb1ae7`\n- `Linux >= 463873d5701427f2964a0b4b72c45f1f14b6df87 < 6deaa317201851c644c431b57682e54d06b35838`\n- `Linux >= 463873d5701427f2964a0b4b72c45f1f14b6df87 < fe168ef1d232d734d9998fd74822e2e20930dfff`\n- `Linux >= 463873d5701427f2964a0b4b72c45f1f14b6df87 < 0c9e6367639548307d3f578f6943ce72c9d39087`\n- `Linux 4.5`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}