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CVE-2026-52927— netfilter: ebtables: fix OOB read in compat_mtw_from_user

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 2.6.34之前版本存在安全漏洞，该漏洞源于ebtables的compat_mtw_from_user函数对match_size/target_size验证不足，可能导致攻击者利用比扩展所需更小的用户提供大小触发越界读取。

CVSS 7.8 · High EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 81e675c227ec60a0bdcbb547dc530ebee23ff931< d7a8fb6f10d55a1c37b0bf8c20cca24dffd76e00 affected
81e675c227ec60a0bdcbb547dc530ebee23ff931< 21af4c030567d2e6c89bb927bc18b51fba52a400 affected
81e675c227ec60a0bdcbb547dc530ebee23ff931< dad9ebf8107955bb54bd3f9cf22591b6ff37bac1 affected
81e675c227ec60a0bdcbb547dc530ebee23ff931< a27cb7325a6c69970041c7f8541fafed5a1ea3ec affected
81e675c227ec60a0bdcbb547dc530ebee23ff931< 7ad0e463fc7eafae2141cc38054264636f8b3e94 affected
81e675c227ec60a0bdcbb547dc530ebee23ff931< bf8e8eac7ede51dc318e06acef5a896dcbba7595 affected
81e675c227ec60a0bdcbb547dc530ebee23ff931< fcc4c043d137e7f1de4673dba1f3116e45377c67 affected
81e675c227ec60a0bdcbb547dc530ebee23ff931< f438d1786d657d57790c5d138d6db3fc9fdac392 affected
… +10 more rows
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I. Basic Information for CVE-2026-52927

Vulnerability Information
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Vulnerability Title
netfilter: ebtables: fix OOB read in compat_mtw_from_user
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: ebtables: fix OOB read in compat_mtw_from_user Luxiao Xu says: The function compat_mtw_from_user() converts ebtables extensions from 32-bit user structures to kernel native structures. However, it lacks proper validation of the user-supplied match_size/target_size. When certain extensions are processed, the kernel-side translation logic may perform memory accesses based on the extension's expected size. If the user provides a size smaller than what the extension requires, it results in an out-of-bounds read as reported by KASAN. This fix introduces a check to ensure match_size is at least as large as the extension's required compatsize. This covers matches, watchers, and targets, while maintaining compatibility with standard targets. AFAIU this is relevant for matches that need to go though match->compat_from_user() call. Those that use plain memcpy with the user-provided size are ok because the caller checks that size vs the start of the next rule entry offset (which itself is checked vs. total size copied from userspace). The ->compat_from_user() callbacks assume they can read compatsize bytes, so they need this extra check. Based on an earlier patch from Luxiao Xu.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/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 2.6.34之前版本存在安全漏洞，该漏洞源于ebtables的compat_mtw_from_user函数对match_size/target_size验证不足，可能导致攻击者利用比扩展所需更小的用户提供大小触发越界读取。
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 81e675c227ec60a0bdcbb547dc530ebee23ff931 ~ d7a8fb6f10d55a1c37b0bf8c20cca24dffd76e00 -
Linux Linux 2.6.34 -

II. Public POCs for CVE-2026-52927

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III. Intelligence Information for CVE-2026-52927

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Patches & Fixes for CVE-2026-52927 (8)

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

CVE-2026-53088 9.8 CRITICAL net: bcmgenet: fix off-by-one in bcmgenet_put_txcb
CVE-2026-53046 9.8 CRITICAL ksmbd: fix use-after-free from async crypto on Qualcomm crypto engine
CVE-2026-53049 9.8 CRITICAL gfs2: add some missing log locking
CVE-2026-52955 9.8 CRITICAL libceph: Fix potential out-of-bounds access in crush_decode()
CVE-2026-53045 9.8 CRITICAL memory: tegra124-emc: Fix dll_change check
CVE-2026-52982 9.8 CRITICAL net: usb: rtl8150: fix use-after-free in rtl8150_start_xmit()
CVE-2026-52986 9.8 CRITICAL netfilter: nf_conntrack_sip: don't use simple_strtoul
CVE-2026-52989 9.8 CRITICAL nvmet-tcp: propagate nvmet_tcp_build_pdu_iovec() errors to its callers
CVE-2026-52993 9.8 CRITICAL tipc: fix double-free in tipc_buf_append()
CVE-2026-53002 9.8 CRITICAL netfilter: conntrack: remove sprintf usage
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-2026-53055 9.8 CRITICAL crypto: hisilicon/sec2 - prevent req used-after-free for sec
CVE-2026-53006 9.8 CRITICAL ipv6: fix possible UAF in icmpv6_rcv()
CVE-2026-52914 9.8 CRITICAL batman-adv: fix fragment reassembly length accounting
CVE-2026-53086 9.8 CRITICAL net: bcmgenet: fix racing timeout handler
CVE-2026-53010 9.8 CRITICAL ksmbd: fix use-after-free in smb2_open during durable reconnect
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-2026-53043 9.1 CRITICAL ocfs2/dlm: validate qr_numregions in dlm_match_regions()

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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