# CVE-2024-49887: linux: In the Linux kernel, the following vulnerability has been resolved:  f2fs: fix to don't panic system for no free segm...

CVE-2024-49887 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-49887, released October 21, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-49887
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0026
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 21, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  f2fs: fix to don't panic system for no free segment fault injection  f2fs: fix to don't panic system for no free segment fault injection  syzbot reports a f2fs bug as below:  F2FS-fs (loop0): inject no free segment in get_new_segment of __allocate_new_segment+0x1ce/0x940 fs/f2fs/segment.c:3167 F2FS-fs (loop0): Stopped filesystem due to reason: 7 ------------[ cut here ]------------ kernel BUG at fs/f2fs/segment.c:2748! CPU: 0 UID: 0 PID: 5109 Comm: syz-executor304 Not tainted 6.11.0-rc6-syzkaller-00363-g89f5e14d05b4 #0 RIP: 0010:get_new_segment fs/f2fs/segment.c:2748 [inline] RIP: 0010:new_curseg+0x1f61/0x1f70 fs/f2fs/segment.c:2836 Call Trace:  __allocate_new_segment+0x1ce/0x940 fs/f2fs/segment.c:3167  f2fs_allocate_new_section fs/f2fs/segment.c:3181 [inline]  f2fs_allocate_pinning_section+0xfa/0x4e0 fs/f2fs/segment.c:3195  f2fs_expand_inode_data+0x5d6/0xbb0 fs/f2fs/file.c:1799  f2fs_fallocate+0x448/0x960 fs/f2fs/file.c:1903  vfs_fallocate+0x553/0x6c0 fs/open.c:334  do_vfs_ioctl+0x2592/0x2e50 fs/ioctl.c:886  __do_sys_ioctl fs/ioctl.c:905 [inline]  __se_sys_ioctl+0x81/0x170 fs/ioctl.c:893  do_syscall_x64 arch/x86/entry/common.c:52 [inline]  do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83  entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0010:get_new_segment fs/f2fs/segment.c:2748 [inline] RIP: 0010:new_curseg+0x1f61/0x1f70 fs/f2fs/segment.c:2836  The root cause is when we inject no free segment fault into f2fs, we should not panic system, fix it.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.11.4-1 | [DEBIAN-CVE-2024-49887](https://patchblox.com/security/data/fix/linux/debian-cve-2024-49887.md) | Oct 21, 2024 |
| Linux | linux Debian 14 | 6.11.4-1 | [DEBIAN-CVE-2024-49887](https://patchblox.com/security/data/fix/linux/debian-cve-2024-49887.md) | Oct 21, 2024 |

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