{"id":"CVE-2026-99118","state":"PUBLISHED","title":"drm/i915/dmc: Harden DMC firmware payload parsing","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/i915/dmc: Harden DMC firmware payload parsing\n\nValidate the conversion of the DMC firmware size from dwords to bytes\nusing check_mul_overflow() before calculating the firmware payload size.\n\nReject zero-length payloads and zero MMIO counts in the DMC firmware\nheader so malformed firmware is caught early. Also set dmc_fw_size only\nafter the payload allocation succeeds.\n\n(cherry picked from commit efde6601a1f1daedfe3dcc2816c934ddb44e3eef)","publishedAt":"2026-10-28T10:34:34.627Z","updatedAt":"2026-10-30T12:41:55.667Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"eb805623d8b161342ed9c9caf366f0a295041a6d","status":"affected","lessThan":"0e396088fa5c1f96ff43de29c2a2f8807078723d","versionType":"git"},{"version":"eb805623d8b161342ed9c9caf366f0a295041a6d","status":"affected","lessThan":"53068cf3851dd4e00e8e668563e0353d9d79a98b","versionType":"git"},{"version":"eb805623d8b161342ed9c9caf366f0a295041a6d","status":"affected","lessThan":"e33921271d4438f4a24014f560e5ab297d7eda3f","versionType":"git"},{"version":"eb805623d8b161342ed9c9caf366f0a295041a6d","status":"affected","lessThan":"4589ad76a6b1011538600ad398baf0b7d73a1252","versionType":"git"},{"version":"eb805623d8b161342ed9c9caf366f0a295041a6d","status":"affected","lessThan":"eb7a0ba650d607976d1a0a5e7501d3f14b35d026","versionType":"git"},{"version":"eb805623d8b161342ed9c9caf366f0a295041a6d","status":"affected","lessThan":"dfcfe2874e7c16e8460dc86ac1eeb54ea0e7f8aa","versionType":"git"},{"version":"eb805623d8b161342ed9c9caf366f0a295041a6d","status":"affected","lessThan":"05f7a2f712f8b287a98ee61a7c2c6b72dad2fc6d","versionType":"git"},{"version":"eb805623d8b161342ed9c9caf366f0a295041a6d","status":"affected","lessThan":"8bb1858db453cd4250e3b633f5d2d09206024ca6","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/i915/display/intel_dmc.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.2","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.2","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.161","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.115","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.59","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.13","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/i915/display/intel_dmc.c"]}],"references":["https://git.kernel.org/stable/c/0e396088fa5c1f96ff43de29c2a2f8807078723d","https://git.kernel.org/stable/c/53068cf3851dd4e00e8e668563e0353d9d79a98b","https://git.kernel.org/stable/c/e33921271d4438f4a24014f560e5ab297d7eda3f","https://git.kernel.org/stable/c/4589ad76a6b1011538600ad398baf0b7d73a1252","https://git.kernel.org/stable/c/eb7a0ba650d607976d1a0a5e7501d3f14b35d026","https://git.kernel.org/stable/c/dfcfe2874e7c16e8460dc86ac1eeb54ea0e7f8aa","https://git.kernel.org/stable/c/05f7a2f712f8b287a98ee61a7c2c6b72dad2fc6d","https://git.kernel.org/stable/c/8bb1858db453cd4250e3b633f5d2d09206024ca6"],"weaknesses":[],"ingestedAt":"2026-10-30T13:02:04.640Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/99xxx/CVE-2026-99118.json","commit":"cb14bf1b43b0c9f05f7f40eae2246263fd430780","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-99118","state":"PUBLISHED","datePublished":"2026-10-28T10:34:34.627Z","dateUpdated":"2026-10-30T12:41:55.667Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:25:14.393Z"},"containers":{"cna":{"title":"drm/i915/dmc: Harden DMC firmware payload parsing","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/i915/dmc: Harden DMC firmware payload parsing\n\nValidate the conversion of the DMC firmware size from dwords to bytes\nusing check_mul_overflow() before calculating the firmware payload size.\n\nReject zero-length payloads and zero MMIO counts in the DMC firmware\nheader so malformed firmware is caught early. Also set dmc_fw_size only\nafter the payload allocation succeeds.\n\n(cherry picked from commit efde6601a1f1daedfe3dcc2816c934ddb44e3eef)"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"eb805623d8b161342ed9c9caf366f0a295041a6d","status":"affected","lessThan":"0e396088fa5c1f96ff43de29c2a2f8807078723d","versionType":"git"},{"version":"eb805623d8b161342ed9c9caf366f0a295041a6d","status":"affected","lessThan":"53068cf3851dd4e00e8e668563e0353d9d79a98b","versionType":"git"},{"version":"eb805623d8b161342ed9c9caf366f0a295041a6d","status":"affected","lessThan":"e33921271d4438f4a24014f560e5ab297d7eda3f","versionType":"git"},{"version":"eb805623d8b161342ed9c9caf366f0a295041a6d","status":"affected","lessThan":"4589ad76a6b1011538600ad398baf0b7d73a1252","versionType":"git"},{"version":"eb805623d8b161342ed9c9caf366f0a295041a6d","status":"affected","lessThan":"eb7a0ba650d607976d1a0a5e7501d3f14b35d026","versionType":"git"},{"version":"eb805623d8b161342ed9c9caf366f0a295041a6d","status":"affected","lessThan":"dfcfe2874e7c16e8460dc86ac1eeb54ea0e7f8aa","versionType":"git"},{"version":"eb805623d8b161342ed9c9caf366f0a295041a6d","status":"affected","lessThan":"05f7a2f712f8b287a98ee61a7c2c6b72dad2fc6d","versionType":"git"},{"version":"eb805623d8b161342ed9c9caf366f0a295041a6d","status":"affected","lessThan":"8bb1858db453cd4250e3b633f5d2d09206024ca6","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/i915/display/intel_dmc.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.2","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.2","versionType":"semver"},{"version":"5.10.273","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.161","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.115","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.59","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.13","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/i915/display/intel_dmc.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/0e396088fa5c1f96ff43de29c2a2f8807078723d"},{"url":"https://git.kernel.org/stable/c/53068cf3851dd4e00e8e668563e0353d9d79a98b"},{"url":"https://git.kernel.org/stable/c/e33921271d4438f4a24014f560e5ab297d7eda3f"},{"url":"https://git.kernel.org/stable/c/4589ad76a6b1011538600ad398baf0b7d73a1252"},{"url":"https://git.kernel.org/stable/c/eb7a0ba650d607976d1a0a5e7501d3f14b35d026"},{"url":"https://git.kernel.org/stable/c/dfcfe2874e7c16e8460dc86ac1eeb54ea0e7f8aa"},{"url":"https://git.kernel.org/stable/c/05f7a2f712f8b287a98ee61a7c2c6b72dad2fc6d"},{"url":"https://git.kernel.org/stable/c/8bb1858db453cd4250e3b633f5d2d09206024ca6"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:41:55.667Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"5.10.273"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"5.15.224"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"6.6.161"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"6.12.115"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"6.18.59"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"7.2.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}