{"cve":"CVE-2025-68802","nvd":{"published":"2026-01-13T16:16:02.260","modified":"2026-06-17T09:59:36.843","status":"Deferred","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/xe: Limit num_syncs to prevent oversized allocations\n\nThe exec and vm_bind ioctl allow userspace to specify an arbitrary\nnum_syncs value. Without bounds checking, a very large num_syncs\ncan force an excessively large allocation, leading to kernel warnings\nfrom the page allocator as below.\n\nIntroduce DRM_XE_MAX_SYNCS (set to 1024) and reject any request\nexceeding this limit.\n\n\"\n------------[ cut here ]------------\nWARNING: CPU: 0 PID: 1217 at mm/page_alloc.c:5124 __alloc_frozen_pages_noprof+0x2f8/0x2180 mm/page_alloc.c:5124\n...\nCall Trace:\n <TASK>\n alloc_pages_mpol+0xe4/0x330 mm/mempolicy.c:2416\n ___kmalloc_large_node+0xd8/0x110 mm/slub.c:4317\n __kmalloc_large_node_noprof+0x18/0xe0 mm/slub.c:4348\n __do_kmalloc_node mm/slub.c:4364 [inline]\n __kmalloc_noprof+0x3d4/0x4b0 mm/slub.c:4388\n kmalloc_noprof include/linux/slab.h:909 [inline]\n kmalloc_array_noprof include/linux/slab.h:948 [inline]\n xe_exec_ioctl+0xa47/0x1e70 drivers/gpu/drm/xe/xe_exec.c:158\n drm_ioctl_kernel+0x1f1/0x3e0 drivers/gpu/drm/drm_ioctl.c:797\n drm_ioctl+0x5e7/0xc50 drivers/gpu/drm/drm_ioctl.c:894\n xe_drm_ioctl+0x10b/0x170 drivers/gpu/drm/xe/xe_device.c:224\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:598 [inline]\n __se_sys_ioctl fs/ioctl.c:584 [inline]\n __x64_sys_ioctl+0x18b/0x210 fs/ioctl.c:584\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xbb/0x380 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n...\n\"\n\nv2: Add \"Reported-by\" and Cc stable kernels.\nv3: Change XE_MAX_SYNCS from 64 to 1024. (Matt & Ashutosh)\nv4: s/XE_MAX_SYNCS/DRM_XE_MAX_SYNCS/ (Matt)\nv5: Do the check at the top of the exec func. (Matt)\n\n(cherry picked from commit b07bac9bd708ec468cd1b8a5fe70ae2ac9b0a11c)","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/1d200017f55f829b9e376093bd31dfbec92081de","https://git.kernel.org/stable/c/8e461304009135270e9ccf2d7e2dfe29daec9b60","https://git.kernel.org/stable/c/e281d1fd6903a081ef023c341145ae92258e38d2"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:19:41.481987139+00:00"},"epss":{"cve":"CVE-2025-68802","score":0.00199,"percentile":0.09726,"date":"2026-11-01"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}