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

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。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1564.008 · Email Hiding Rules

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 7942b919f7321f95a777d396ff7894a7a83dc9b0< e0a0c4903cbba351f0f5b5d104960d3a5b23202f affected
7942b919f7321f95a777d396ff7894a7a83dc9b0< 9472d37799a0b9ff9b99639f35961ac2f0b3c9be affected
7942b919f7321f95a777d396ff7894a7a83dc9b0< 65e07964b4b2daf9a54e686cf0fa72d74a9648a8 affected
7942b919f7321f95a777d396ff7894a7a83dc9b0< b88f905d4449b70da6bda547be546e365e44352e affected
7942b919f7321f95a777d396ff7894a7a83dc9b0< 4525658002be3ad310b16bf8db48c8adb6a55d32 affected
7942b919f7321f95a777d396ff7894a7a83dc9b0< e5ff0ba4b6983cdbcc826efc201e7179ece5d46f affected
7942b919f7321f95a777d396ff7894a7a83dc9b0< 94094e70fe292c9566502772d4d4d6d6a99204b1 affected
7942b919f7321f95a777d396ff7894a7a83dc9b0< be3e5d10643d3be1cbac9d9939f220a99253f980 affected
… +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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
N/A
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 7942b919f7321f95a777d396ff7894a7a83dc9b0 ~ e0a0c4903cbba351f0f5b5d104960d3a5b23202f -
Linux Linux 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-2026-53309 9.8 CRITICAL ocfs2/dlm: fix off-by-one in dlm_match_regions() region comparison
CVE-2026-53281 8.8 HIGH iommu/vt-d: Avoid NULL pointer dereference or refcount corruption
CVE-2026-53322 8.8 HIGH vfio/pci: Clean up DMABUFs before disabling function
CVE-2026-53300 7.8 HIGH net: enetc: fix NTMP DMA use-after-free issue
CVE-2026-53290 7.8 HIGH drm/xe/eustall: Fix drm_dev_put called before stream disable in close
CVE-2026-53284 7.5 HIGH btrfs: only release the dirty pages io tree after successful writes
CVE-2026-53310 soc/tegra: cbb: Fix cross-fabric target timeout lookup
CVE-2026-53324 net: mana: Use pci_name() for debugfs directory naming
CVE-2026-53318 wifi: mt76: mt7925: prevent NULL pointer dereference in mt7925_tx_check_aggr()
CVE-2026-53321 io_uring/napi: cap busy_poll_to 10 msec
CVE-2026-53319 blk-wbt: remove WARN_ON_ONCE from wbt_init_enable_default()
CVE-2026-53323 net: dsa: remove redundant netdev_lock_ops() from conduit ethtool ops
CVE-2026-53312 iommu/riscv: Remove overflows on the invalidation path
CVE-2026-53311 fuse: fix uninit-value in fuse_dentry_revalidate()
CVE-2026-53304 scsi: sg: Resolve soft lockup issue when opening /dev/sgX
CVE-2026-53308 power: supply: max77705: Free allocated workqueue and fix removal order
CVE-2026-53307 pinctrl: pinconf-generic: Fully validate 'pinmux' property
CVE-2026-53305 usb: typec: ps883x: Fix Oops at unbind
CVE-2026-53306 tty: hvc_iucv: fix off-by-one in number of supported devices
CVE-2026-53301 reset: amlogic: t7: Fix null reset ops

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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