{"id":"CVE-2026-89793","summary":"ublk: clear VM_MAYWRITE on read-only ublk char device mmap","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nublk: clear VM_MAYWRITE on read-only ublk char device mmap\n\nublk_ch_mmap() rejects mmap requests with VM_WRITE set, but never\nclears VM_MAYWRITE on the resulting read-only mapping. This allows\na userspace daemon to mmap the per-queue command buffer PROT_READ,\nthen upgrade it to PROT_WRITE via mprotect(), since VM_MAYWRITE was\nnever cleared.\n\nThe command buffer holds struct ublksrv_io_desc entries that are\nkernel-written ABI; a writable mapping lets an unprivileged daemon\nprocess corrupt fields such as addr, op_flags, nr_sectors, and\nstart_sector.\n\nSame bug class as the drm/panthor and drm/vc4 VM_MAYWRITE fixes, and\nthe 2026-08-13 ptp/vmclock fix (a5edadbae57e).\n\nVerified via mprotect() PoC: before the fix, a PROT_READ mapping can\nbe upgraded to PROT_READ|PROT_WRITE and a write into the command\nbuffer corrupts io_desc fields (confirmed under KASAN). After the\nfix, mprotect() returns -EACCES.","modified":"2026-09-18T03:48:32.309883962Z","published":"2026-09-16T09:54:33.678Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89793.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/5befd06a72216869b607cf7724a4f16c6a2d3999"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6e2b571b0a54755b06e092501913e1dfefe75d6c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/be41733c24be58e2a1ef718c80fafdfb98a40d5e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e373c1acdbcf88cec533ece9f589020adaed0a78"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fa5e1bc673ca59722608af67b27e65dba0c97926"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89793.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89793"},{"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":"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2"},{"fixed":"be41733c24be58e2a1ef718c80fafdfb98a40d5e"},{"fixed":"5befd06a72216869b607cf7724a4f16c6a2d3999"},{"fixed":"e373c1acdbcf88cec533ece9f589020adaed0a78"},{"fixed":"fa5e1bc673ca59722608af67b27e65dba0c97926"},{"fixed":"6e2b571b0a54755b06e092501913e1dfefe75d6c"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"fixed":"6.6.157"},{"fixed":"6.12.110"},{"fixed":"6.18.51"},{"fixed":"7.2.5"}]}],"versions":["v6.12.109","v6.6.156","v7.2.4","v6.18.50","v7.3-rc1","v7.2.3","v6.18.49","v6.12.108","v7.2.2","v6.18.48","v6.12.107","v6.6.155","v7.2","v7.2.1","v6.18.47","v6.12.106","v6.6.154","v6.18.46","v6.12.105","v6.6.153","v6.18.45","v6.12.104","v6.6.152","v7.2-rc1","v7.2-rc5","v6.18.44","v6.12.103","v6.6.151","v7.2-rc7","v7.2-rc2","v7.2-rc6","v7.2-rc3","v6.18.43","v6.12.102","v6.6.150","v6.6.149","v6.12.101","v6.18.42","v6.6.148","v7.2-rc4","v6.18.41","v6.12.100","v6.6.147","v6.18.40","v6.12.99","v6.6.146","v6.12.98","v6.6.145","v6.12.97","v6.18.39","v6.12.96","v6.6.144","v6.18.38","v6.12.95","v6.18.37","v6.12.94","v6.6.143","v6.18.36","v7.1","v7.1-rc1","v6.18.35","v6.12.93","v6.6.142","v7.1-rc7","v7.1-rc6","v7.1-rc4","v7.1-rc3","v6.18.34","v6.12.92","v7.1-rc2","v7.1-rc5","v6.18.33","v6.12.91","v6.6.141","v6.18.32","v6.12.90","v6.6.140","v7.0","v6.18.31","v6.12.89","v6.6.139","v6.18.30","v6.12.88","v6.6.138","v6.18.29","v6.12.87","v6.18.28","v6.18.27","v6.12.86","v6.6.137","v6.18.26","v6.12.85","v7.0-rc1","v6.6.136","v6.12.84","v6.18.25","v6.18.24","v6.12.83","v6.6.135","v6.18.23","v6.12.82","v6.18.22","v6.12.81","v6.6.134","v7.0-rc5","v7.0-rc6","v6.18.21","v6.12.80","v6.6.133","v7.0-rc7","v7.0-rc3","v7.0-rc4","v6.6.132","v6.19-rc2","v6.6.131","v6.18.20","v6.12.79","v6.6.130","v7.0-rc2","v6.19","v6.12.78","v6.18.19","v6.12.77","v6.6.129","v6.18.18","v6.18.17","v6.12.76","v6.18.16","v6.6.128","v6.12.75","v6.18.15","v6.6.127","v6.12.74","v6.18.14","v6.18.13","v6.18.12","v6.12.73","v6.6.126","v6.18.11","v6.12.72","v6.6.125","v6.18.10","v6.12.71","v6.6.124","v6.12.70","v6.18.9","v6.12.69","v6.6.123","v6.19-rc8","v6.19-rc1","v6.19-rc6","v6.18.8","v6.12.68","v6.6.122","v6.19-rc7","v6.19-rc5","v6.19-rc4","v6.18.7","v6.12.67","v6.6.121","v6.19-rc3","v6.18.6","v6.12.66","v6.18.5","v6.12.65","v6.6.120","v6.18.4","v6.12.64","v6.6.119","v6.18.3","v6.12.63","v6.18.2","v6.18.1","v6.12.62","v6.18","v6.12.61","v6.18-rc1","v6.12.60","v6.6.118","v6.18-rc7","v6.18-rc3","v6.12.59","v6.6.117","v6.18-rc5","v6.18-rc6","v6.18-rc2","v6.12.58","v6.6.116","v6.18-rc4","v6.12.57","v6.12.56","v6.6.115","v6.12.55","v6.6.114","v6.12.54","v6.6.113","v6.12.53","v6.6.112","v6.12.52","v6.6.111","v6.12.51","v6.6.110","v6.17","v6.17-rc7","v6.12.50","v6.6.109","v6.17-rc1","v6.17-rc2","v6.12.49","v6.6.108","v6.17-rc6","v6.17-rc4","v6.17-rc5","v6.17-rc3","v6.16","v6.12.48","v6.6.107","v6.12.47","v6.6.106","v6.12.46","v6.6.105","v6.12.45","v6.6.104","v6.12.44","v6.6.103","v6.12.43","v6.6.102","v6.12.42","v6.12.41","v6.6.101","v6.16-rc6","v6.12.40","v6.6.100","v6.16-rc1","v6.16-rc4","v6.16-rc2","v6.16-rc5","v6.16-rc7","v6.16-rc3","v6.12.39","v6.6.99","v6.14-rc3","v6.12.38","v6.6.98","v6.12.37","v6.6.97","v6.12.36","v6.6.96","v6.12.35","v6.6.95","v6.12.34","v6.6.94","v6.12.33","v6.6.93","v6.15","v6.12.32","v6.15-rc1","v6.15-rc6","v6.15-rc3","v6.12.31","v6.6.92","v6.12.30","v6.15-rc2","v6.15-rc7","v6.15-rc4","v6.12.29","v6.6.91","v6.12.28","v6.6.90","v6.15-rc5","v6.12.27","v6.6.89","v6.12.26","v6.14","v6.12.25","v6.6.88","v6.12.24","v6.6.87","v6.12.23","v6.12.22","v6.6.86","v6.12.21","v6.6.85","v6.14-rc1","v6.14-rc7","v6.14-rc6","v6.12.20","v6.6.84","v6.14-rc4","v6.14-rc5","v6.12.19","v6.6.83","v6.14-rc2","v6.12.18","v6.6.82","v6.6.81","v6.12.17","v6.6.80","v6.12.16","v6.6.79","v6.12.15","v6.6.78","v6.13","v6.1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