CVE-2024-26956— nilfs2: fix failure to detect DAT corruption in btree and direct mappings
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I. Basic Information for CVE-2024-26956
Vulnerability Information
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Vulnerability Title
nilfs2: fix failure to detect DAT corruption in btree and direct mappings
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: nilfs2: fix failure to detect DAT corruption in btree and direct mappings Patch series "nilfs2: fix kernel bug at submit_bh_wbc()". This resolves a kernel BUG reported by syzbot. Since there are two flaws involved, I've made each one a separate patch. The first patch alone resolves the syzbot-reported bug, but I think both fixes should be sent to stable, so I've tagged them as such. This patch (of 2): Syzbot has reported a kernel bug in submit_bh_wbc() when writing file data to a nilfs2 file system whose metadata is corrupted. There are two flaws involved in this issue. The first flaw is that when nilfs_get_block() locates a data block using btree or direct mapping, if the disk address translation routine nilfs_dat_translate() fails with internal code -ENOENT due to DAT metadata corruption, it can be passed back to nilfs_get_block(). This causes nilfs_get_block() to misidentify an existing block as non-existent, causing both data block lookup and insertion to fail inconsistently. The second flaw is that nilfs_get_block() returns a successful status in this inconsistent state. This causes the caller __block_write_begin_int() or others to request a read even though the buffer is not mapped, resulting in a BUG_ON check for the BH_Mapped flag in submit_bh_wbc() failing. This fixes the first issue by changing the return value to code -EINVAL when a conversion using DAT fails with code -ENOENT, avoiding the conflicting condition that leads to the kernel bug described above. Here, code -EINVAL indicates that metadata corruption was detected during the block lookup, which will be properly handled as a file system error and converted to -EIO when passing through the nilfs2 bmap layer.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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，该漏洞源于无法检测 btree 和直接映射中的 DAT 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-2024-26956
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Same Patch Batch · Linux · 2024-05-01 · 159 CVEs total
| CVE-2024-27038 | clk: Fix clk_core_get NULL dereference | |
| CVE-2024-27029 | drm/amdgpu: fix mmhub client id out-of-bounds access | |
| CVE-2024-27030 | octeontx2-af: Use separate handlers for interrupts | |
| CVE-2024-27031 | NFS: Fix nfs_netfs_issue_read() xarray locking for writeback interrupt | |
| CVE-2024-27032 | f2fs: fix to avoid potential panic during recovery | |
| CVE-2024-27033 | f2fs: fix to remove unnecessary f2fs_bug_on() to avoid panic | |
| CVE-2024-27034 | f2fs: compress: fix to cover normal cluster write with cp_rwsem | |
| CVE-2024-27035 | f2fs: compress: fix to guarantee persisting compressed blocks by CP | |
| CVE-2024-27036 | cifs: Fix writeback data corruption | |
| CVE-2024-27037 | clk: zynq: Prevent null pointer dereference caused by kmalloc failure | |
| CVE-2024-27044 | drm/amd/display: Fix potential NULL pointer dereferences in 'dcn10_set_output_transfer_fun | |
| CVE-2024-27048 | wifi: brcm80211: handle pmk_op allocation failure | |
| CVE-2024-27047 | net: phy: fix phy_get_internal_delay accessing an empty array | |
| CVE-2024-27046 | nfp: flower: handle acti_netdevs allocation failure | |
| CVE-2024-27045 | drm/amd/display: Fix a potential buffer overflow in 'dp_dsc_clock_en_read()' | |
| CVE-2024-27041 | drm/amd/display: fix NULL checks for adev->dm.dc in amdgpu_dm_fini() | |
| CVE-2024-27039 | clk: hisilicon: hi3559a: Fix an erroneous devm_kfree() | |
| CVE-2024-27040 | drm/amd/display: Add 'replay' NULL check in 'edp_set_replay_allow_active()' | |
| CVE-2024-27028 | spi: spi-mt65xx: Fix NULL pointer access in interrupt handler | |
| CVE-2024-27043 | media: edia: dvbdev: fix a use-after-free |
Showing top 20 of 159 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
Same vendor: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
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