{"id":"CVE-2026-68257","title":"drm/amdkfd: fix 32-bit overflow in CWSR total size calculation","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: fix 32-bit overflow in CWSR total size calculation\n\ntotal_cwsr_size was computed in 32-bit before being used as a BO/SVM\nallocation size.\nWith large ctx_sav…","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 >= 325aa07165394b8e866ffe9ec1d4c99d9195b2f2 < b88ffe6593607364a8c06a48c6f29e55437cdf8e","Linux >= d15deafab5d722afb9e2f83c5edcdef9d9d98bd1 < abce3276c57e36c955627307469b9f009057a467","Linux >= d15deafab5d722afb9e2f83c5edcdef9d9d98bd1 < 865532d54eb57b660b1cb1b0e1755776ce21b849","Linux >= d15deafab5d722afb9e2f83c5edcdef9d9d98bd1 < 2b0386d4293920e690c0e017708f999b93cc729b","Linux 63600103d2ac5c09fdeec5b931b396e4e0efd5d8","Linux >= 6.12.59 < 6.12.101","Linux >= 6.17.9 < 6.18","Linux 6.18"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:46:15.764782Z"},"published":"2026-08-10","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:53:04.998Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-68257","references":[{"url":"https://git.kernel.org/stable/c/b88ffe6593607364a8c06a48c6f29e55437cdf8e"},{"url":"https://git.kernel.org/stable/c/abce3276c57e36c955627307469b9f009057a467"},{"url":"https://git.kernel.org/stable/c/865532d54eb57b660b1cb1b0e1755776ce21b849"},{"url":"https://git.kernel.org/stable/c/2b0386d4293920e690c0e017708f999b93cc729b"}],"tags":["cve.org"],"epss":0.00138,"epssPercentile":0.02842,"ingestedAt":"2026-10-16T17:24:46.856Z","slug":"CVE-2026-68257","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdkfd: fix 32-bit overflow in CWSR total size calculation\n\ntotal_cwsr_size was computed in 32-bit before being used as a BO/SVM\nallocation size.\nWith large ctx_save_restore_area_size and debug_memory_size\nmultiplied by the XCC count, the product can wrap,\nyielding an undersized CWSR save area that firmware later overruns.\n\nPromote total_cwsr_size to u64 and use check_add_overflow()/\ncheck_mul_overflow() in both kfd_queue_acquire_buffers() and\nkfd_queue_release_buffers().\n\n(cherry picked from commit 319f7e13423ae3f486b9aea82f9ad2d6af0ee608)\n\n## Affected\n\n- `Linux >= 325aa07165394b8e866ffe9ec1d4c99d9195b2f2 < b88ffe6593607364a8c06a48c6f29e55437cdf8e`\n- `Linux >= d15deafab5d722afb9e2f83c5edcdef9d9d98bd1 < abce3276c57e36c955627307469b9f009057a467`\n- `Linux >= d15deafab5d722afb9e2f83c5edcdef9d9d98bd1 < 865532d54eb57b660b1cb1b0e1755776ce21b849`\n- `Linux >= d15deafab5d722afb9e2f83c5edcdef9d9d98bd1 < 2b0386d4293920e690c0e017708f999b93cc729b`\n- `Linux 63600103d2ac5c09fdeec5b931b396e4e0efd5d8`\n- `Linux >= 6.12.59 < 6.12.101`\n- `Linux >= 6.17.9 < 6.18`\n- `Linux 6.18`\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":[]}