{"id":"CVE-2026-89777","summary":"vfio/pci: clear vdev-\u003emsi_perm after freeing it on init failure","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nvfio/pci: clear vdev-\u003emsi_perm after freeing it on init failure\n\nvfio_msi_cap_len() lazily allocates the per-device MSI permission table:\n\n\tvdev-\u003emsi_perm = kmalloc_obj(struct perm_bits, GFP_KERNEL_ACCOUNT);\n\tif (!vdev-\u003emsi_perm)\n\t\treturn -ENOMEM;\n\n\tret = init_pci_cap_msi_perm(vdev-\u003emsi_perm, len, flags);\n\tif (ret) {\n\t\tkfree(vdev-\u003emsi_perm);\n\t\treturn ret;\t\t/* vdev-\u003emsi_perm left dangling */\n\t}\n\nWhen init_pci_cap_msi_perm() -\u003e alloc_perm_bits() fails with -ENOMEM, the\nerror path frees vdev-\u003emsi_perm but leaves the freed pointer stored in\nit. vdev-\u003emsi_perm is not re-zeroed later because struct\nvfio_pci_core_device is per-device and persists across open/close cycles,\nand the vfio_config_init() error path returns without calling\nvfio_config_free(). So the dangling pointer outlives the failed open.\n\nThat leads to two use-after-frees on the same device:\n\n1. Reuse. The next vfio_config_init() sees the stale pointer at\n   \"if (vdev-\u003emsi_perm) return len;\" and reuses the freed object. MSI\n   config accesses in vfio_pci_config_rw_single() then dereference and\n   call the freed perm-\u003ereadfn / perm-\u003ewritefn function pointers.\n\n2. Double free. A later vfio_config_free() runs free_perm_bits() and\n   kfree() on the already-freed object.\n\nFix it by NULLing vdev-\u003emsi_perm after the kfree(), matching the\nNULL-after-free discipline already used in free_perm_bits() and\nvfio_config_free().\n\n  BUG: KASAN: slab-use-after-free in vfio_pci_config_rw_single (drivers/vfio/pci/vfio_pci_config.c:1961)\n  Read of size 8 at addr ffff88800fcc88d0 by task exploit/143\n  Call Trace:\n   ...\n   kasan_report (mm/kasan/report.c:595)\n   vfio_pci_config_rw_single (drivers/vfio/pci/vfio_pci_config.c:1961)\n   vfio_pci_config_rw (drivers/vfio/pci/vfio_pci_config.c:1986)\n   vfio_pci_rw (drivers/vfio/pci/vfio_pci_core.c:1599)\n   vfs_read (fs/read_write.c:572)\n   __x64_sys_pread64 (fs/read_write.c:764)\n   do_syscall_64 (arch/x86/entry/syscall_64.c:94)\n   ...\n\nFollowed on device close by a double free of the same object:\n\n  Oops: general protection fault, probably for non-canonical address\n    0x1f63e0e8000008: 0000 [#1] SMP KASAN NOPTI\n  RIP: 0010:kfree (mm/slub.c:6711)\n  Call Trace:\n   vfio_config_free (drivers/vfio/pci/vfio_pci_config.c:1861)\n   vfio_pci_core_disable (drivers/vfio/pci/vfio_pci_core.c:685)\n   vfio_pci_core_close_device (drivers/vfio/pci/vfio_pci_core.c:777)\n   vfio_df_close (drivers/vfio/vfio_main.c:602)\n   vfio_device_fops_release (drivers/vfio/vfio_main.c:648)\n   __fput (fs/file_table.c:512)\n   __x64_sys_close (fs/open.c:1496)\n   do_syscall_64 (arch/x86/entry/syscall_64.c:94)\n   ...\n  Kernel panic - not syncing: Fatal exception","modified":"2026-09-18T03:48:32.414215250Z","published":"2026-09-16T08:48:17.754Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89777.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/25cdd2a492d868cff1e519a60fe282909c52d385"},{"type":"WEB","url":"https://git.kernel.org/stable/c/533d0c5feef85ee6404b9f41d5564fac6971a008"},{"type":"WEB","url":"https://git.kernel.org/stable/c/812f1db7f0755a19ef16ecdc5cec51bcabc5eda5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d665a1688af7f8fefd7c0eb04f2a37122ce007f4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/dc77acfeb979dded39b247b60fef0399536bfa77"},{"type":"WEB","url":"https://git.kernel.org/stable/c/eb84cd81040e58dd05ac190f561f2115e3367249"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f0eea8f9013676b42289ec35941e848b8a543e19"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fda8fb7e8179561693a786a7af593f6b944a21c1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89777.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89777"},{"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":"30ea32ab1951c80c6113f300fce2c70cd12659e4"},{"fixed":"eb84cd81040e58dd05ac190f561f2115e3367249"},{"fixed":"f0eea8f9013676b42289ec35941e848b8a543e19"},{"fixed":"d665a1688af7f8fefd7c0eb04f2a37122ce007f4"},{"fixed":"25cdd2a492d868cff1e519a60fe282909c52d385"},{"fixed":"812f1db7f0755a19ef16ecdc5cec51bcabc5eda5"},{"fixed":"533d0c5feef85ee6404b9f41d5564fac6971a008"},{"fixed":"fda8fb7e8179561693a786a7af593f6b944a21c1"},{"fixed":"dc77acfeb979dded39b247b60fef0399536bfa77"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0"},{"last_affected":"ac370e3d1f3b01519d2705cd5815d1c9d0a8812b"},{"last_affected":"be363e27ec3c3a99793da2be6c07eafb95709c6b"},{"last_affected":"f1b10ba5739440ca51d66f0b2949cead88d2dd02"},{"last_affected":"dde3433de9a067a33d67d65b9093cad3e043e49e"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.4.203"},{"fixed":"4.5"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.9.203"},{"fixed":"4.10"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.14.155"},{"fixed":"4.15"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"4.19.85"},{"fixed":"4.20"}]}],"versions":["v4.4.202","v4.9.202","v4.19.84","v4.14.154","v4.9.201","v4.4.201","v4.19.83","v4.14.153","v4.9.200","v4.4.200","v4.19.82","v4.14.152","v4.9.199","v4.4.199","v4.19.81","v4.14.151","v4.9.198","v4.4.198","v4.19.80","v4.14.150","v4.9.197","v4.4.197","v4.19.79","v4.14.149","v4.9.196","v4.4.196","v4.19.78","v4.14.148","v4.4.195","v4.19.77","v4.14.147","v4.9.195","v4.19.76","v4.14.146","v4.9.194","v4.4.194","v4.19.75","v4.19.74","v4.14.145","v4.9.193","v4.4.193","v4.19.73","v4.14.144","v4.19.72","v4.14.143","v4.9.192","v4.4.192","v4.19.71","v4.14.142","v4.9.191","v4.4.191","v4.19.70","v4.19.69","v4.14.141","v4.9.190","v4.4.190","v4.19.68","v4.14.140","v4.4.189","v4.9.189","v4.14.139","v4.19.67","v4.14.138","v4.19.66","v4.9.188","v4.4.188","v4.14.137","v4.19.65","v4.19.64","v4.14.136","v4.9.187","v4.4.187","v4.4.186","v4.9.186","v4.14.135","v4.19.63","v4.14.134","v4.19.62","v4.19.61","v4.19.60","v4.4.185","v4.9.185","v4.14.133","v4.19.59","v4.19.58","v4.4.184","v4.9.184","v4.14.132","v4.19.57","v4.14.131","v4.19.56","v4.14.130","v4.9.183","v4.4.183","v4.14.129","v4.19.55","v4.19.54","v4.4.182","v4.9.182","v4.14.128","v4.19.53","v4.14.127","v4.19.52","v4.4.181","v4.9.181","v4.14.126","v4.19.51","v4.14.125","v4.19.50","v4.4.180","v4.9.180","v4.14.124","v4.19.49","v4.14.123","v4.19.48","v4.19.47","v4.9.179","v4.14.122","v4.19.46","v4.9.178","v4.14.121","v4.19.45","v4.19.44","v4.14.120","v4.9.177","v4.4.179","v4.9.176","v4.14.119","v4.19.43","v4.9.175","v4.14.118","v4.19.42","v4.19.41","v4.14.117","v4.9.174","v4.19.40","v4.14.116","v4.9.173","v4.19.39","v4.19.38","v4.14.115","v4.9.172","v4.19.37","v4.14.114","v4.9.171","v4.19.36","v4.14.113","v4.9.170","v4.4.178","v4.19.35","v4.14.112","v4.9.169","v4.19.34","v4.14.111","v4.9.168","v4.19.33","v4.14.110","v4.9.167","v4.19.32","v4.14.109","v4.9.166","v4.4.177","v4.19.31","v4.14.108","v4.9.165","v4.19.30","v4.14.107","v4.9.164","v4.4.176","v4.9.163","v4.14.106","v4.19.29","v4.9.162","v4.14.105","v4.19.28","v4.19.27","v4.19.26","v4.14.104","v4.9.161","v4.19.25","v4.14.103","v4.9.160","v4.19.24","v4.14.102","v4.9.159","v4.4.175","v4.19.23","v4.14.101","v4.9.158","v4.4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