{"id":"AZL-50895","summary":"CVE-2024-47688 affecting package kernel for versions less than 6.6.56.1-5","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ndriver core: Fix a potential null-ptr-deref in module_add_driver()\n\nInject fault while probing of-fpga-region, if kasprintf() fails in\nmodule_add_driver(), the second sysfs_remove_link() in exit path will cause\nnull-ptr-deref as below because kernfs_name_hash() will call strlen() with\nNULL driver_name.\n\nFix it by releasing resources based on the exit path sequence.\n\n\t KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\n\t Mem abort info:\n\t   ESR = 0x0000000096000005\n\t   EC = 0x25: DABT (current EL), IL = 32 bits\n\t   SET = 0, FnV = 0\n\t   EA = 0, S1PTW = 0\n\t   FSC = 0x05: level 1 translation fault\n\t Data abort info:\n\t   ISV = 0, ISS = 0x00000005, ISS2 = 0x00000000\n\t   CM = 0, WnR = 0, TnD = 0, TagAccess = 0\n\t   GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0\n\t [dfffffc000000000] address between user and kernel address ranges\n\t Internal error: Oops: 0000000096000005 [#1] PREEMPT SMP\n\t Dumping ftrace buffer:\n\t    (ftrace buffer empty)\n\t Modules linked in: of_fpga_region(+) fpga_region fpga_bridge cfg80211 rfkill 8021q garp mrp stp llc ipv6 [last unloaded: of_fpga_region]\n\t CPU: 2 UID: 0 PID: 2036 Comm: modprobe Not tainted 6.11.0-rc2-g6a0e38264012 #295\n\t Hardware name: linux,dummy-virt (DT)\n\t pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n\t pc : strlen+0x24/0xb0\n\t lr : kernfs_name_hash+0x1c/0xc4\n\t sp : ffffffc081f97380\n\t x29: ffffffc081f97380 x28: ffffffc081f97b90 x27: ffffff80c821c2a0\n\t x26: ffffffedac0be418 x25: 0000000000000000 x24: ffffff80c09d2000\n\t x23: 0000000000000000 x22: 0000000000000000 x21: 0000000000000000\n\t x20: 0000000000000000 x19: 0000000000000000 x18: 0000000000001840\n\t x17: 0000000000000000 x16: 0000000000000000 x15: 1ffffff8103f2e42\n\t x14: 00000000f1f1f1f1 x13: 0000000000000004 x12: ffffffb01812d61d\n\t x11: 1ffffff01812d61c x10: ffffffb01812d61c x9 : dfffffc000000000\n\t x8 : 0000004fe7ed29e4 x7 : ffffff80c096b0e7 x6 : 0000000000000001\n\t x5 : ffffff80c096b0e0 x4 : 1ffffffdb990efa2 x3 : 0000000000000000\n\t x2 : 0000000000000000 x1 : dfffffc000000000 x0 : 0000000000000000\n\t Call trace:\n\t  strlen+0x24/0xb0\n\t  kernfs_name_hash+0x1c/0xc4\n\t  kernfs_find_ns+0x118/0x2e8\n\t  kernfs_remove_by_name_ns+0x80/0x100\n\t  sysfs_remove_link+0x74/0xa8\n\t  module_add_driver+0x278/0x394\n\t  bus_add_driver+0x1f0/0x43c\n\t  driver_register+0xf4/0x3c0\n\t  __platform_driver_register+0x60/0x88\n\t  of_fpga_region_init+0x20/0x1000 [of_fpga_region]\n\t  do_one_initcall+0x110/0x788\n\t  do_init_module+0x1dc/0x5c8\n\t  load_module+0x3c38/0x4cac\n\t  init_module_from_file+0xd4/0x128\n\t  idempotent_init_module+0x2cc/0x528\n\t  __arm64_sys_finit_module+0xac/0x100\n\t  invoke_syscall+0x6c/0x258\n\t  el0_svc_common.constprop.0+0x160/0x22c\n\t  do_el0_svc+0x44/0x5c\n\t  el0_svc+0x48/0xb8\n\t  el0t_64_sync_handler+0x13c/0x158\n\t  el0t_64_sync+0x190/0x194\n\t Code: f2fbffe1 a90157f4 12000802 aa0003f5 (38e16861)\n\t ---[ end trace 0000000000000000 ]---\n\t Kernel panic - not syncing: Oops: Fatal exception","modified":"2026-04-21T04:30:28.010137Z","published":"2024-10-21T12:15:05Z","upstream":["CVE-2024-47688"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-47688"}],"affected":[{"package":{"name":"kernel","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/kernel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.6.56.1-5"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-50895.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}