CVE-2023-53311— nilfs2: fix use-after-free of nilfs_root in dirtying inodes via iput
Quick assessment
Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于nilfs2文件系统中nilfs_root结构在iput操作期间被释放后重用，可能导致内存损坏。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 18
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 0ae45f63d4ef8d8eeec49c7d8b44a1775fff13e8< 11afd67f1b3c28eb216e50a3ca8dbcb69bb71793 |
affected |
0ae45f63d4ef8d8eeec49c7d8b44a1775fff13e8< a3c3b4cbf9b8554120fb230e6516e980c6277487 |
affected | ||
0ae45f63d4ef8d8eeec49c7d8b44a1775fff13e8< d2c539c216cce74837a9cf5804eb205939b82227 |
affected | ||
0ae45f63d4ef8d8eeec49c7d8b44a1775fff13e8< 37207240872456fbab44a110bde6640445233963 |
affected | ||
0ae45f63d4ef8d8eeec49c7d8b44a1775fff13e8< 3645510cf926e6af2f4d44899370d7e5331c93bd |
affected | ||
0ae45f63d4ef8d8eeec49c7d8b44a1775fff13e8< 7532ff6edbf5242376b24a95a2fefb59bb653e5a |
affected | ||
0ae45f63d4ef8d8eeec49c7d8b44a1775fff13e8< 5828d5f5dc877dcfdd7b23102e978e2ecfd86d82 |
affected | ||
0ae45f63d4ef8d8eeec49c7d8b44a1775fff13e8< f8654743a0e6909dc634cbfad6db6816f10f3399 |
affected | ||
| … +10 more rows | |||
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I. Basic Information for CVE-2023-53311
Vulnerability Information
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Vulnerability Title
nilfs2: fix use-after-free of nilfs_root in dirtying inodes via iput
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
nilfs2: fix use-after-free of nilfs_root in dirtying inodes via iput
During unmount process of nilfs2, nothing holds nilfs_root structure after
nilfs2 detaches its writer in nilfs_detach_log_writer(). Previously,
nilfs_evict_inode() could cause use-after-free read for nilfs_root if
inodes are left in "garbage_list" and released by nilfs_dispose_list at
the end of nilfs_detach_log_writer(), and this bug was fixed by commit
9b5a04ac3ad9 ("nilfs2: fix use-after-free bug of nilfs_root in
nilfs_evict_inode()").
However, it turned out that there is another possibility of UAF in the
call path where mark_inode_dirty_sync() is called from iput():
nilfs_detach_log_writer()
nilfs_dispose_list()
iput()
mark_inode_dirty_sync()
__mark_inode_dirty()
nilfs_dirty_inode()
__nilfs_mark_inode_dirty()
nilfs_load_inode_block() --> causes UAF of nilfs_root struct
This can happen after commit 0ae45f63d4ef ("vfs: add support for a
lazytime mount option"), which changed iput() to call
mark_inode_dirty_sync() on its final reference if i_state has I_DIRTY_TIME
flag and i_nlink is non-zero.
This issue appears after commit 28a65b49eb53 ("nilfs2: do not write dirty
data after degenerating to read-only") when using the syzbot reproducer,
but the issue has potentially existed before.
Fix this issue by adding a "purging flag" to the nilfs structure, setting
that flag while disposing the "garbage_list" and checking it in
__nilfs_mark_inode_dirty().
Unlike commit 9b5a04ac3ad9 ("nilfs2: fix use-after-free bug of nilfs_root
in nilfs_evict_inode()"), this patch does not rely on ns_writer to
determine whether to skip operations, so as not to break recovery on
mount. The nilfs_salvage_orphan_logs routine dirties the buffer of
salvaged data before attaching the log writer, so changing
__nilfs_mark_inode_dirty() to skip the operation when ns_writer is NULL
will cause recovery write to fail. The purpose of using the cleanup-only
flag is to allow for narrowing of such conditions.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于nilfs2文件系统中nilfs_root结构在iput操作期间被释放后重用，可能导致内存损坏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2023-53311
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Linux · 2025-09-16 · 115 CVEs total
| CVE-2022-50350 | 9.8 CRITICAL | scsi: target: iscsi: Fix a race condition between login_work and the login thread |
| CVE-2023-53297 | 8.8 HIGH | Bluetooth: L2CAP: fix "bad unlock balance" in l2cap_disconnect_rsp |
| CVE-2023-53315 | 8.8 HIGH | wifi: ath11k: Fix SKB corruption in REO destination ring |
| CVE-2023-53305 | 8.8 HIGH | Bluetooth: L2CAP: Fix use-after-free |
| CVE-2023-53322 | 8.8 HIGH | scsi: qla2xxx: Wait for io return on terminate rport |
| CVE-2025-39806 | 8.8 HIGH | HID: multitouch: fix slab out-of-bounds access in mt_report_fixup() |
| CVE-2025-39826 | 8.8 HIGH | net: rose: convert 'use' field to refcount_t |
| CVE-2025-39827 | 8.8 HIGH | net: rose: include node references in rose_neigh refcount |
| CVE-2025-39809 | 8.4 HIGH | HID: intel-thc-hid: intel-quicki2c: Fix ACPI dsd ICRS/ISUB length |
| CVE-2023-53333 | 8.2 HIGH | netfilter: conntrack: dccp: copy entire header to stack buffer, not just basic one |
| CVE-2022-50341 | 7.8 HIGH | cifs: fix oops during encryption |
| CVE-2025-39810 | 7.8 HIGH | bnxt_en: Fix memory corruption when FW resources change during ifdown |
| CVE-2025-39815 | 7.8 HIGH | RISC-V: KVM: fix stack overrun when loading vlenb |
| CVE-2023-53286 | 7.8 HIGH | RDMA/mlx5: Return the firmware result upon destroying QP/RQ |
| CVE-2025-39818 | 7.8 HIGH | HID: intel-thc-hid: intel-thc: Fix incorrect pointer arithmetic in I2C regs save |
| CVE-2023-53314 | 7.8 HIGH | fbdev/ep93xx-fb: Do not assign to struct fb_info.dev |
| CVE-2022-50339 | 7.8 HIGH | Bluetooth: avoid hci_dev_test_and_set_flag() in mgmt_init_hdev() |
| CVE-2023-53263 | 7.8 HIGH | drm/nouveau/disp: fix use-after-free in error handling of nouveau_connector_create |
| CVE-2023-53274 | 7.8 HIGH | clk: mediatek: mt8183: Add back SSPM related clocks |
| CVE-2023-53331 | 7.8 HIGH | pstore/ram: Check start of empty przs during init |
Showing top 20 of 115 CVEs. View all on vendor page → →
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V. Comments for CVE-2023-53311
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