{"cve":"CVE-2024-56582","nvd":{"published":"2024-12-27T15:15:17.333","modified":"2026-06-17T08:12:28.167","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix use-after-free in btrfs_encoded_read_endio()\n\nShinichiro reported the following use-after free that sometimes is\nhappening in our CI system when running fstests' btrfs/284 on a TCMU\nrunner device:\n\n  BUG: KASAN: slab-use-after-free in lock_release+0x708/0x780\n  Read of size 8 at addr ffff888106a83f18 by task kworker/u80:6/219\n\n  CPU: 8 UID: 0 PID: 219 Comm: kworker/u80:6 Not tainted 6.12.0-rc6-kts+ #15\n  Hardware name: Supermicro Super Server/X11SPi-TF, BIOS 3.3 02/21/2020\n  Workqueue: btrfs-endio btrfs_end_bio_work [btrfs]\n  Call Trace:\n   <TASK>\n   dump_stack_lvl+0x6e/0xa0\n   ? lock_release+0x708/0x780\n   print_report+0x174/0x505\n   ? lock_release+0x708/0x780\n   ? __virt_addr_valid+0x224/0x410\n   ? lock_release+0x708/0x780\n   kasan_report+0xda/0x1b0\n   ? lock_release+0x708/0x780\n   ? __wake_up+0x44/0x60\n   lock_release+0x708/0x780\n   ? __pfx_lock_release+0x10/0x10\n   ? __pfx_do_raw_spin_lock+0x10/0x10\n   ? lock_is_held_type+0x9a/0x110\n   _raw_spin_unlock_irqrestore+0x1f/0x60\n   __wake_up+0x44/0x60\n   btrfs_encoded_read_endio+0x14b/0x190 [btrfs]\n   btrfs_check_read_bio+0x8d9/0x1360 [btrfs]\n   ? lock_release+0x1b0/0x780\n   ? trace_lock_acquire+0x12f/0x1a0\n   ? __pfx_btrfs_check_read_bio+0x10/0x10 [btrfs]\n   ? process_one_work+0x7e3/0x1460\n   ? lock_acquire+0x31/0xc0\n   ? process_one_work+0x7e3/0x1460\n   process_one_work+0x85c/0x1460\n   ? __pfx_process_one_work+0x10/0x10\n   ? assign_work+0x16c/0x240\n   worker_thread+0x5e6/0xfc0\n   ? __pfx_worker_thread+0x10/0x10\n   kthread+0x2c3/0x3a0\n   ? __pfx_kthread+0x10/0x10\n   ret_from_fork+0x31/0x70\n   ? __pfx_kthread+0x10/0x10\n   ret_from_fork_asm+0x1a/0x30\n   </TASK>\n\n  Allocated by task 3661:\n   kasan_save_stack+0x30/0x50\n   kasan_save_track+0x14/0x30\n   __kasan_kmalloc+0xaa/0xb0\n   btrfs_encoded_read_regular_fill_pages+0x16c/0x6d0 [btrfs]\n   send_extent_data+0xf0f/0x24a0 [btrfs]\n   process_extent+0x48a/0x1830 [btrfs]\n   changed_cb+0x178b/0x2ea0 [btrfs]\n   btrfs_ioctl_send+0x3bf9/0x5c20 [btrfs]\n   _btrfs_ioctl_send+0x117/0x330 [btrfs]\n   btrfs_ioctl+0x184a/0x60a0 [btrfs]\n   __x64_sys_ioctl+0x12e/0x1a0\n   do_syscall_64+0x95/0x180\n   entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\n  Freed by task 3661:\n   kasan_save_stack+0x30/0x50\n   kasan_save_track+0x14/0x30\n   kasan_save_free_info+0x3b/0x70\n   __kasan_slab_free+0x4f/0x70\n   kfree+0x143/0x490\n   btrfs_encoded_read_regular_fill_pages+0x531/0x6d0 [btrfs]\n   send_extent_data+0xf0f/0x24a0 [btrfs]\n   process_extent+0x48a/0x1830 [btrfs]\n   changed_cb+0x178b/0x2ea0 [btrfs]\n   btrfs_ioctl_send+0x3bf9/0x5c20 [btrfs]\n   _btrfs_ioctl_send+0x117/0x330 [btrfs]\n   btrfs_ioctl+0x184a/0x60a0 [btrfs]\n   __x64_sys_ioctl+0x12e/0x1a0\n   do_syscall_64+0x95/0x180\n   entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\n  The buggy address belongs to the object at ffff888106a83f00\n   which belongs to the cache kmalloc-rnd-07-96 of size 96\n  The buggy address is located 24 bytes inside of\n   freed 96-byte region [ffff888106a83f00, ffff888106a83f60)\n\n  The buggy address belongs to the physical page:\n  page: refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888106a83800 pfn:0x106a83\n  flags: 0x17ffffc0000000(node=0|zone=2|lastcpupid=0x1fffff)\n  page_type: f5(slab)\n  raw: 0017ffffc0000000 ffff888100053680 ffffea0004917200 0000000000000004\n  raw: ffff888106a83800 0000000080200019 00000001f5000000 0000000000000000\n  page dumped because: kasan: bad access detected\n\n  Memory state around the buggy address:\n   ffff888106a83e00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc\n   ffff888106a83e80: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc\n  >ffff888106a83f00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc\n                              ^\n   ffff888106a83f80: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc\n   ffff888106a84000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00\n  ==================================================================\n\nFurther analyzing the trace and \n---truncated---","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":["CWE-416"],"references":["https://git.kernel.org/stable/c/05b36b04d74a517d6675bf2f90829ff1ac7e28dc","https://git.kernel.org/stable/c/6228f13f1996a4feb9b601d6644bf0bfe03671dd","https://git.kernel.org/stable/c/a40de0330af4fb7bc6b354250c24f294f8b826a0","https://git.kernel.org/stable/c/f8a5129e4a9fc3f6aa3f137513253b51b31b94d4","https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:57:56.913276502+00:00"},"epss":{"cve":"CVE-2024-56582","score":0.00237,"percentile":0.14816,"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."]}