{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-46079",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2026-46079"
  ],
  "published": "2026-05-27T12:59:23Z",
  "summary": "rbd: fix null-ptr-deref when device_add_disk() fails",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nrbd: fix null-ptr-deref when device_add_disk() fails\n\ndo_rbd_add() publishes the device with device_add() before calling\ndevice_add_disk(). If device_add_disk() fails after device_add()\nsucceeds, the error path calls rbd_free_disk() directly and then later\nfalls through to rbd_dev_device_release(), which calls rbd_free_disk()\nagain. This double teardown can leave blk-mq cleanup operating on\ninvalid state and trigger a null-ptr-deref in\n__blk_mq_free_map_and_rqs(), reached from blk_mq_free_tag_set().\n\nFix this by following the normal remove ordering: call device_del()\nbefore rbd_dev_device_release() when device_add_disk() fails after\ndevice_add(). That keeps the teardown sequence consistent and avoids\nre-entering disk cleanup through the wrong path.\n\nThe bug was first flagged by an experimental analysis tool we are\ndeveloping for kernel memory-management bugs while analyzing\nv6.13-rc1. The tool is still under development and is not yet publicly\navailable.\n\nWe reproduced the bug on v7.0 with a real Ceph backend and a QEMU x86_64\nguest booted with KASAN and CONFIG_FAILSLAB enabled. The reproducer\nconfines failslab injections to the __add_disk() range and injects\nfail-nth while mapping an RBD image through\n/sys/bus/rbd/add_single_major.\n\nOn the unpatched kernel, fail-nth=4 reliably triggered the fault:\n\n\tOops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI\n\tKASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\n\tCPU: 0 UID: 0 PID: 273 Comm: bash Not tainted 7.0.0-01247-gd60bc1401583 #6 PREEMPT(lazy)\n\tHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014\n\tRIP: 0010:__blk_mq_free_map_and_rqs+0x8c/0x240\n\tCode: 00 00 48 8b 6b 60 41 89 f4 49 c1 e4 03 4c 01 e5 45 85 ed 0f 85 0a 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 e9 48 c1 e9 03 <80> 3c 01 00 0f 85 31 01 00 00 4c 8b 6d 00 4d 85 ed 0f 84 e2 00 00\n\tRSP: 0018:ff1100000ab0fac8 EFLAGS: 00000246\n\tRAX: dffffc0000000000 RBX: ff1100000c4806a0 RCX: 0000000000000000\n\tRDX: 0000000000000002 RSI: 0000000000000000 RDI: ff1100000c4806f4\n\tRBP: 0000000000000000 R08: 0000000000000001 R09: ffe21c000189001b\n\tR10: ff1100000c4800df R11: ff1100006cf37be0 R12: 0000000000000000\n\tR13: 0000000000000000 R14: ff1100000c480700 R15: ff1100000c480004\n\tFS:  00007f0fbe8fe740(0000) GS:ff110000e5851000(0000) knlGS:0000000000000000\n\tCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n\tCR2: 00007fe53473b2e0 CR3: 0000000012eef000 CR4: 00000000007516f0\n\tPKRU: 55555554\n\tCall Trace:\n\t <TASK>\n\t blk_mq_free_tag_set+0x77/0x460\n\t do_rbd_add+0x1446/0x2b80\n\t ? __pfx_do_rbd_add+0x10/0x10\n\t ? lock_acquire+0x18c/0x300\n\t ? find_held_lock+0x2b/0x80\n\t ? sysfs_file_kobj+0xb6/0x1b0\n\t ? __pfx_sysfs_kf_write+0x10/0x10\n\t kernfs_fop_write_iter+0x2f4/0x4a0\n\t vfs_write+0x98e/0x1000\n\t ? expand_files+0x51f/0x850\n\t ? __pfx_vfs_write+0x10/0x10\n\t ksys_write+0xf2/0x1d0\n\t ? __pfx_ksys_write+0x10/0x10\n\t do_syscall_64+0x115/0x690\n\t entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\tRIP: 0033:0x7f0fbea15907\n\tCode: 10 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 48 89 54 24 18 48 89 74 24\n\tRSP: 002b:00007ffe22346ea8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001\n\tRAX: ffffffffffffffda RBX: 0000000000000058 RCX: 00007f0fbea15907\n\tRDX: 0000000000000058 RSI: 0000563ace6c0ef0 RDI: 0000000000000001\n\tRBP: 0000563ace6c0ef0 R08: 0000563ace6c0ef0 R09: 6b6435726d694141\n\tR10: 5250337279762f78 R11: 0000000000000246 R12: 0000000000000058\n\tR13: 00007f0fbeb1c780 R14: ff1100000c480700 R15: ff1100000c480004\n\t </TASK>\n\nWith this fix applied, rerunning the reproducer over fail-nth=1..256\nyields no KASAN reports.\n\n[ idryomov: rename err_out_device_del -> err_out_device ]",
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