# CVE-2022-48923: linux: In the Linux kernel, the following vulnerability has been resolved:  btrfs: prevent copying too big compressed lzo se...

CVE-2022-48923 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-48923, released August 22, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-48923
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0023
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 22, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  btrfs: prevent copying too big compressed lzo segment  Compressed length can be corrupted to be a lot larger than memory we have allocated for buffer. This will cause memcpy in copy_compressed_segment to write outside of allocated memory.  This mostly results in stuck read syscall but sometimes when using btrfs send can get #GP    kernel: general protection fault, probably for non-canonical address 0x841551d5c1000: 0000 [#1] PREEMPT SMP NOPTI   kernel: CPU: 17 PID: 264 Comm: kworker/u256:7 Tainted: P           OE     5.17.0-rc2-1 #12   kernel: Workqueue: btrfs-endio btrfs_work_helper [btrfs]   kernel: RIP: 0010:lzo_decompress_bio (./include/linux/fortify-string.h:225 fs/btrfs/lzo.c:322 fs/btrfs/lzo.c:394) btrfs   Code starting with the faulting instruction   ===========================================      0:*  48 8b 06                mov    (%rsi),%rax              <-- trapping instruction      3:   48 8d 79 08             lea    0x8(%rcx),%rdi      7:   48 83 e7 f8             and    $0xfffffffffffffff8,%rdi      b:   48 89 01                mov    %rax,(%rcx)      e:   44 89 f0                mov    %r14d,%eax     11:   48 8b 54 06 f8          mov    -0x8(%rsi,%rax,1),%rdx   kernel: RSP: 0018:ffffb110812efd50 EFLAGS: 00010212   kernel: RAX: 0000000000001000 RBX: 000000009ca264c8 RCX: ffff98996e6d8ff8   kernel: RDX: 0000000000000064 RSI: 000841551d5c1000 RDI: ffffffff9500435d   kernel: RBP: ffff989a3be856c0 R08: 0000000000000000 R09: 0000000000000000   kernel: R10: 0000000000000000 R11: 0000000000001000 R12: ffff98996e6d8000   kernel: R13: 0000000000000008 R14: 0000000000001000 R15: 000841551d5c1000   kernel: FS:  0000000000000000(0000) GS:ffff98a09d640000(0000) knlGS:0000000000000000   kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033   kernel: CR2: 00001e9f984d9ea8 CR3: 000000014971a000 CR4: 00000000003506e0   kernel: Call Trace:   kernel:  <TASK>   kernel: end_compressed_bio_read (fs/btrfs/compression.c:104 fs/btrfs/compression.c:1363 fs/btrfs/compression.c:323) btrfs   kernel: end_workqueue_fn (fs/btrfs/disk-io.c:1923) btrfs   kernel: btrfs_work_helper (fs/btrfs/async-thread.c:326) btrfs   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)   kernel: worker_thread (./include/linux/list.h:292 kernel/workqueue.c:2455)   kernel: ? process_one_work (kernel/workqueue.c:2397)   kernel: kthread (kernel/kthread.c:377)   kernel: ? kthread_complete_and_exit (kernel/kthread.c:332)   kernel: ret_from_fork (arch/x86/entry/entry_64.S:301)   kernel:  </TASK>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.16.12-1 | [DEBIAN-CVE-2022-48923](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48923.md) | Aug 22, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.16.12-1 | [DEBIAN-CVE-2022-48923](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48923.md) | Aug 22, 2024 |
| Linux | linux Debian 14 | 5.16.12-1 | [DEBIAN-CVE-2022-48923](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48923.md) | Aug 22, 2024 |

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