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CVE-2026-53320— nilfs2: reject zero bd_oblocknr in nilfs_ioctl_mark_blocks_dirty()

AI Predicted 5.5 Difficulty: Moderate EPSS 0.17% · P7

Possible ATT&CK Techniques 1AI

T1564.008 · Email Hiding Rules

Affected Version Matrix 18

VendorProductVersion RangeStatus
LinuxLinux7942b919f7321f95a777d396ff7894a7a83dc9b0< e0a0c4903cbba351f0f5b5d104960d3a5b23202faffected
7942b919f7321f95a777d396ff7894a7a83dc9b0< 9472d37799a0b9ff9b99639f35961ac2f0b3c9beaffected
7942b919f7321f95a777d396ff7894a7a83dc9b0< 65e07964b4b2daf9a54e686cf0fa72d74a9648a8affected
7942b919f7321f95a777d396ff7894a7a83dc9b0< b88f905d4449b70da6bda547be546e365e44352eaffected
7942b919f7321f95a777d396ff7894a7a83dc9b0< 4525658002be3ad310b16bf8db48c8adb6a55d32affected
7942b919f7321f95a777d396ff7894a7a83dc9b0< e5ff0ba4b6983cdbcc826efc201e7179ece5d46faffected
7942b919f7321f95a777d396ff7894a7a83dc9b0< 94094e70fe292c9566502772d4d4d6d6a99204b1affected
7942b919f7321f95a777d396ff7894a7a83dc9b0< be3e5d10643d3be1cbac9d9939f220a99253f980affected
… +10 more rows
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I. Basic Information for CVE-2026-53320

Vulnerability Information
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Vulnerability Title
nilfs2: reject zero bd_oblocknr in nilfs_ioctl_mark_blocks_dirty()
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: nilfs2: reject zero bd_oblocknr in nilfs_ioctl_mark_blocks_dirty() nilfs_ioctl_mark_blocks_dirty() uses bd_oblocknr to detect dead blocks by comparing it with the current block number bd_blocknr. If they differ, the block is considered dead and skipped. However, bd_oblocknr should never be 0 since block 0 typically stores the primary superblock and is never a valid GC target block. A corrupted ioctl request with bd_oblocknr set to 0 causes the comparison to incorrectly match when the lookup returns -ENOENT and sets bd_blocknr to 0, bypassing the dead block check and calling nilfs_bmap_mark() on a non-existent block. This causes nilfs_btree_do_lookup() to return -ENOENT, triggering the WARN_ON(ret == -ENOENT). Fix this by rejecting ioctl requests with bd_oblocknr set to 0 at the beginning of each iteration. [ryusuke: slightly modified the commit message and comments for accuracy]
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基金会开源的操作系统Linux所使用的内核。 Linux kernel 2.6.30版本存在安全漏洞，该漏洞源于nilfs2中nilfs_ioctl_mark_blocks_dirty()函数未能正确验证bd_oblocknr参数为零的情况，可能导致触发WARN_ON并造成拒绝服务。
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux 7942b919f7321f95a777d396ff7894a7a83dc9b0 ~ e0a0c4903cbba351f0f5b5d104960d3a5b23202f -
LinuxLinux 2.6.30 -

II. Public POCs for CVE-2026-53320

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III. Intelligence Information for CVE-2026-53320

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Patches & Fixes for CVE-2026-53320 (8)

Same Patch Batch · Linux · 2026-06-26 · 47 CVEs total

CVE-2026-533099.8 CRITICALocfs2/dlm: fix off-by-one in dlm_match_regions() region comparison
CVE-2026-533228.8 HIGHvfio/pci: Clean up DMABUFs before disabling function
CVE-2026-532818.8 HIGHiommu/vt-d: Avoid NULL pointer dereference or refcount corruption
CVE-2026-533007.8 HIGHnet: enetc: fix NTMP DMA use-after-free issue
CVE-2026-532907.8 HIGHdrm/xe/eustall: Fix drm_dev_put called before stream disable in close
CVE-2026-532847.5 HIGHbtrfs: only release the dirty pages io tree after successful writes
CVE-2026-53293drm/amdgpu: fix AMDGPU_INFO_READ_MMR_REG
CVE-2026-53324net: mana: Use pci_name() for debugfs directory naming
CVE-2026-53283iommu/amd: Bounds-check devid in __rlookup_amd_iommu()
CVE-2026-53280iommu: Fix NULL group->domain dereference in pci_dev_reset_iommu_done()
CVE-2026-53282x86/kexec: Push kjump return address even for non-kjump kexec
CVE-2026-53279drm/gma500/oaktrail_lvds: fix hang on init failure
CVE-2026-53292net: phonet: do not BUG_ON() in pn_socket_autobind() on failed bind
CVE-2026-53291ALSA: hda/conexant: Fix missing error check for jack detection
CVE-2026-53289ice: fix NULL pointer dereference in ice_reset_all_vfs()
CVE-2026-53294mailbox: mailbox-test: don't free the reused channel
CVE-2026-53295mailbox: add sanity check for channel array
CVE-2026-53296mailbox: mailbox-test: free channels on probe error
CVE-2026-53297net: mana: Guard mana_remove against double invocation
CVE-2026-53298net: airoha: Move ndesc initialization at end of airoha_qdma_init_rx_queue()

Showing top 20 of 47 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-53320

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