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CVE-2026-53309— ocfs2/dlm: fix off-by-one in dlm_match_regions() region comparison

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存在安全漏洞，该漏洞源于dlm_match_regions()区域比较循环中使用'<='而非'<'，导致越界读取，存在差一错误。以下版本受到影响：2.6.37版本。

CVSS 9.8 · Critical EPSS 0.40% · P33

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux ea2034416b54700e30371f2ad6517cbb94674083< 760ab35040aca8399021fdb9ff1db1089feb7194 affected
ea2034416b54700e30371f2ad6517cbb94674083< c60a2710b73838d250cda57344c049b89abc5d52 affected
ea2034416b54700e30371f2ad6517cbb94674083< 2a0673836f019e7c032acbf48d022d5ccf02a845 affected
ea2034416b54700e30371f2ad6517cbb94674083< 819d8ebad3200a53de99bd7e297bc428e41ced54 affected
ea2034416b54700e30371f2ad6517cbb94674083< d5403ae28085761d58b555645bc7d5feadb10073 affected
ea2034416b54700e30371f2ad6517cbb94674083< 1fb7f356547d9688822315cd2b205ff0bd5429b4 affected
ea2034416b54700e30371f2ad6517cbb94674083< 426cd8eedac89b86148d4478990eeef16e8a2520 affected
ea2034416b54700e30371f2ad6517cbb94674083< 01b61e8dda9b0fdb0d4cda43de25f4e390554d7b affected
… +10 more rows
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I. Basic Information for CVE-2026-53309

Vulnerability Information
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Vulnerability Title
ocfs2/dlm: fix off-by-one in dlm_match_regions() region comparison
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ocfs2/dlm: fix off-by-one in dlm_match_regions() region comparison The local-vs-remote region comparison loop uses '<=' instead of '<', causing it to read one entry past the valid range of qr_regions. The other loops in the same function correctly use '<'. Fix the loop condition to use '<' for consistency and correctness.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/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基金会开源的操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于dlm_match_regions()区域比较循环中使用'<='而非'<'，导致越界读取，存在差一错误。以下版本受到影响：2.6.37版本。
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 ea2034416b54700e30371f2ad6517cbb94674083 ~ 760ab35040aca8399021fdb9ff1db1089feb7194 -
Linux Linux 2.6.37 -

II. Public POCs for CVE-2026-53309

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III. Intelligence Information for CVE-2026-53309

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Patches & Fixes for CVE-2026-53309 (8)

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

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-2026-53319 blk-wbt: remove WARN_ON_ONCE from wbt_init_enable_default()
CVE-2026-53321 io_uring/napi: cap busy_poll_to 10 msec
CVE-2026-53320 nilfs2: reject zero bd_oblocknr in nilfs_ioctl_mark_blocks_dirty()
CVE-2026-53323 net: dsa: remove redundant netdev_lock_ops() from conduit ethtool ops
CVE-2026-53313 drm/amd/display: Avoid NULL dereference in dc_dmub_srv error paths
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-2026-53309

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