{"uuid": "7a7c695b-d8c9-4f4f-8513-9a370fb4e2bc", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "2a075640-a300-48a4-bb44-bc6130783b9b", "vulnerability": "CVE-2022-48923", "type": "published-proof-of-concept", "source": "https://t.me/DarkWebInformer_CVEAlerts/16473", "content": "\ud83d\udd17 DarkWebInformer.com - Cyber Threat Intelligence\n\ud83d\udccc CVE ID: CVE-2022-48923\n\ud83d\udd25 CVSS Score: N/A\n\ud83d\udd39 Description: In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: prevent copying too big compressed lzo segment\n\nCompressed length can be corrupted to be a lot larger than memory\nwe have allocated for buffer.\nThis will cause memcpy in copy_compressed_segment to write outside\nof allocated memory.\n\nThis mostly results in stuck read syscall but sometimes when using\nbtrfs send can get #GP\n\n  kernel: general protection fault, probably for non-canonical address 0x841551d5c1000: 0000 [#1] PREEMPT SMP NOPTI\n  kernel: CPU: 17 PID: 264 Comm: kworker/u256:7 Tainted: P           OE     5.17.0-rc2-1 #12\n  kernel: Workqueue: btrfs-endio btrfs_work_helper [btrfs]\n  kernel: RIP: 0010:lzo_decompress_bio (./include/linux/fortify-string.h:225 fs/btrfs/lzo.c:322 fs/btrfs/lzo.c:394) btrfs\n  Code starting with the faulting instruction\n  ===========================================\n     0:*  48 8b 06                mov    (%rsi),%rax              <-- trapping instruction\n     3:   48 8d 79 08             lea    0x8(%rcx),%rdi\n     7:   48 83 e7 f8             and    $0xfffffffffffffff8,%rdi\n     b:   48 89 01                mov    %rax,(%rcx)\n     e:   44 89 f0                mov    %r14d,%eax\n    11:   48 8b 54 06 f8          mov    -0x8(%rsi,%rax,1),%rdx\n  kernel: RSP: 0018:ffffb110812efd50 EFLAGS: 00010212\n  kernel: RAX: 0000000000001000 RBX: 000000009ca264c8 RCX: ffff98996e6d8ff8\n  kernel: RDX: 0000000000000064 RSI: 000841551d5c1000 RDI: ffffffff9500435d\n  kernel: RBP: ffff989a3be856c0 R08: 0000000000000000 R09: 0000000000000000\n  kernel: R10: 0000000000000000 R11: 0000000000001000 R12: ffff98996e6d8000\n  kernel: R13: 0000000000000008 R14: 0000000000001000 R15: 000841551d5c1000\n  kernel: FS:  0000000000000000(0000) GS:ffff98a09d640000(0000) knlGS:0000000000000000\n  kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n  kernel: CR2: 00001e9f984d9ea8 CR3: 000000014971a000 CR4: 00000000003506e0\n  kernel: Call Trace:\n  kernel:  \n  kernel: end_compressed_bio_read (fs/btrfs/compression.c:104 fs/btrfs/compression.c:1363 fs/btrfs/compression.c:323) btrfs\n  kernel: end_workqueue_fn (fs/btrfs/disk-io.c:1923) btrfs\n  kernel: btrfs_work_helper (fs/btrfs/async-thread.c:326) btrfs\n  kernel: process_one_work (./arch/x86/include/asm/jump_label.h:27 ./include/linux/jump_label.h:212 ./include/trace/events/workqueue.h:108 kernel/workqueue.c:2312)\n  kernel: worker_thread (./include/linux/list.h:292 kernel/workqueue.c:2455)\n  kernel: ? process_one_work (kernel/workqueue.c:2397)\n  kernel: kthread (kernel/kthread.c:377)\n  kernel: ? kthread_complete_and_exit (kernel/kthread.c:332)\n  kernel: ret_from_fork (arch/x86/entry/entry_64.S:301)\n  kernel:  \n\ud83d\udccf Published: 2024-08-22T01:32:58.084Z\n\ud83d\udccf Modified: 2025-05-15T12:28:19.161Z\n\ud83d\udd17 References:\n1. https://git.kernel.org/stable/c/8df508b7a44cd8110c726057cd28e8f8116885eb\n2. https://git.kernel.org/stable/c/e326bd06cdde46df952361456232022298281d16\n3. https://git.kernel.org/stable/c/741b23a970a79d5d3a1db2d64fa2c7b375a4febb", "creation_timestamp": "2025-05-15T12:34:19.000000Z"}