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CVE-2026-53043— ocfs2/dlm: validate qr_numregions in dlm_match_regions()

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，该漏洞源于在dlm_match_regions()中未验证DLM_QUERY_REGION网络消息的qr_numregions字段，导致可能触发越界读取。以下版本受到影响：2.6.37版本。

CVSS 9.1 · Critical EPSS 0.51% · P43

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux ea2034416b54700e30371f2ad6517cbb94674083< d3d5efade0c79dac1cac98c0cb1115432f804439 affected
ea2034416b54700e30371f2ad6517cbb94674083< f69551139caf6d24242a0ad049ee46b264e3aee0 affected
ea2034416b54700e30371f2ad6517cbb94674083< 1f8b91275912cd428289c1fb424bebd7ff5302bd affected
ea2034416b54700e30371f2ad6517cbb94674083< f37de46149db49abd2b24f4f0c5a88cf4dfb5f47 affected
ea2034416b54700e30371f2ad6517cbb94674083< 6c6e8fc3c007319981647b410c29bb5775048551 affected
ea2034416b54700e30371f2ad6517cbb94674083< 3f474c33ebc2e2ca3fcb587d7de4375348f13373 affected
ea2034416b54700e30371f2ad6517cbb94674083< 3c2d0de23ae4be22b6c18e8f0915be74d3b5fb21 affected
ea2034416b54700e30371f2ad6517cbb94674083< 7ab3fbb01bc6d79091bc375e5235d360cd9b78be affected
… +10 more rows
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I. Basic Information for CVE-2026-53043

Vulnerability Information
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Vulnerability Title
ocfs2/dlm: validate qr_numregions in dlm_match_regions()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: ocfs2/dlm: validate qr_numregions in dlm_match_regions() Patch series "ocfs2/dlm: fix two bugs in dlm_match_regions()". In dlm_match_regions(), the qr_numregions field from a DLM_QUERY_REGION network message is used to drive loops over the qr_regions buffer without sufficient validation. This series fixes two issues: - Patch 1 adds a bounds check to reject messages where qr_numregions exceeds O2NM_MAX_REGIONS. The o2net layer only validates message byte length; it does not constrain field values, so a crafted message can set qr_numregions up to 255 and trigger out-of-bounds reads past the 1024-byte qr_regions buffer. - Patch 2 fixes an off-by-one in the local-vs-remote comparison loop, which uses '<=' instead of '<', reading one entry past the valid range even when qr_numregions is within bounds. This patch (of 2): The qr_numregions field from a DLM_QUERY_REGION network message is used directly as loop bounds in dlm_match_regions() without checking against O2NM_MAX_REGIONS. Since qr_regions is sized for at most O2NM_MAX_REGIONS (32) entries, a crafted message with qr_numregions > 32 causes out-of-bounds reads past the qr_regions buffer. Add a bounds check for qr_numregions before entering the loops.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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，该漏洞源于在dlm_match_regions()中未验证DLM_QUERY_REGION网络消息的qr_numregions字段，导致可能触发越界读取。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 ~ d3d5efade0c79dac1cac98c0cb1115432f804439 -
Linux Linux 2.6.37 -

II. Public POCs for CVE-2026-53043

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III. Intelligence Information for CVE-2026-53043

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Patches & Fixes for CVE-2026-53043 (8)

Same Patch Batch · Linux · 2026-06-24 · 219 CVEs total

CVE-2026-53046 9.8 CRITICAL ksmbd: fix use-after-free from async crypto on Qualcomm crypto engine
CVE-2026-53010 9.8 CRITICAL ksmbd: fix use-after-free in smb2_open during durable reconnect
CVE-2026-53088 9.8 CRITICAL net: bcmgenet: fix off-by-one in bcmgenet_put_txcb
CVE-2026-53006 9.8 CRITICAL ipv6: fix possible UAF in icmpv6_rcv()
CVE-2026-53002 9.8 CRITICAL netfilter: conntrack: remove sprintf usage
CVE-2026-53086 9.8 CRITICAL net: bcmgenet: fix racing timeout handler
CVE-2026-52993 9.8 CRITICAL tipc: fix double-free in tipc_buf_append()
CVE-2026-52989 9.8 CRITICAL nvmet-tcp: propagate nvmet_tcp_build_pdu_iovec() errors to its callers
CVE-2026-52986 9.8 CRITICAL netfilter: nf_conntrack_sip: don't use simple_strtoul
CVE-2026-52982 9.8 CRITICAL net: usb: rtl8150: fix use-after-free in rtl8150_start_xmit()
CVE-2026-53045 9.8 CRITICAL memory: tegra124-emc: Fix dll_change check
CVE-2026-52955 9.8 CRITICAL libceph: Fix potential out-of-bounds access in crush_decode()
CVE-2026-53049 9.8 CRITICAL gfs2: add some missing log locking
CVE-2026-53055 9.8 CRITICAL crypto: hisilicon/sec2 - prevent req used-after-free for sec
CVE-2026-52931 9.8 CRITICAL batman-adv: tp_meter: avoid use of uninit sender vars
CVE-2026-52924 9.8 CRITICAL sctp: purge outqueue on stale COOKIE-ECHO handling
CVE-2026-52914 9.8 CRITICAL batman-adv: fix fragment reassembly length accounting
CVE-2026-52999 9.1 CRITICAL netfilter: nfnetlink_osf: fix out-of-bounds read on option matching
CVE-2026-52958 9.1 CRITICAL libceph: Fix potential out-of-bounds access in osdmap_decode()
CVE-2026-53057 8.8 HIGH iommu/riscv: Add IOTINVAL after updating DDT/PDT entries

Showing top 20 of 219 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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