CVE-2026-52927
published 2026-06-24CVE-2026-52927: 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…
PriorityP342high7.8CVSS 3.1
AVLACLPRLUINSUCHIHAH
EPSS
0.12%
2.2th percentile
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.
Affected
22 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linux | linux | — | — |
| linux | linux | >= 81e675c227ec60a0bdcbb547dc530ebee23ff931 < d7a8fb6f10d55a1c37b0bf8c20cca24dffd76e00 | d7a8fb6f10d55a1c37b0bf8c20cca24dffd76e00 |
| linux | linux | >= 81e675c227ec60a0bdcbb547dc530ebee23ff931 < 21af4c030567d2e6c89bb927bc18b51fba52a400 | 21af4c030567d2e6c89bb927bc18b51fba52a400 |
| linux | linux | >= 81e675c227ec60a0bdcbb547dc530ebee23ff931 < dad9ebf8107955bb54bd3f9cf22591b6ff37bac1 | dad9ebf8107955bb54bd3f9cf22591b6ff37bac1 |
| linux | linux | >= 81e675c227ec60a0bdcbb547dc530ebee23ff931 < a27cb7325a6c69970041c7f8541fafed5a1ea3ec | a27cb7325a6c69970041c7f8541fafed5a1ea3ec |
| linux | linux | >= 81e675c227ec60a0bdcbb547dc530ebee23ff931 < 7ad0e463fc7eafae2141cc38054264636f8b3e94 | 7ad0e463fc7eafae2141cc38054264636f8b3e94 |
| linux | linux | >= 81e675c227ec60a0bdcbb547dc530ebee23ff931 < bf8e8eac7ede51dc318e06acef5a896dcbba7595 | bf8e8eac7ede51dc318e06acef5a896dcbba7595 |
| linux | linux | >= 81e675c227ec60a0bdcbb547dc530ebee23ff931 < fcc4c043d137e7f1de4673dba1f3116e45377c67 | fcc4c043d137e7f1de4673dba1f3116e45377c67 |
| linux | linux | >= 81e675c227ec60a0bdcbb547dc530ebee23ff931 < f438d1786d657d57790c5d138d6db3fc9fdac392 | f438d1786d657d57790c5d138d6db3fc9fdac392 |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 2.6.34 < 5.10.259 | 5.10.259 |
| linux | linux_kernel | >= 5.11 < 5.15.210 | 5.15.210 |
| linux | linux_kernel | >= 5.16 < 6.1.176 | 6.1.176 |
| linux | linux_kernel | >= 6.13 < 6.18.35 | 6.18.35 |
| linux | linux_kernel | >= 6.19 < 7.0.12 | 7.0.12 |
| linux | linux_kernel | >= 6.2 < 6.6.143 | 6.6.143 |
| linux | linux_kernel | >= 6.7 < 6.12.93 | 6.12.93 |
CVSS provenance
nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
vendor_redhat5.5MEDIUM
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Red Hat
kernel: netfilter: ebtables: fix OOB read in compat_mtw_from_user
vendor_redhat·2026-06-24·CVSS 5.5
CVE-2026-52927 [MEDIUM] CWE-1284 kernel: netfilter: ebtables: fix OOB read in compat_mtw_from_user
kernel: netfilter: ebtables: fix OOB read in compat_mtw_from_user
A flaw was found in the Linux kernel's netfilter ebtables component. The `compat_mtw_from_user` function, responsible for converting ebtables extensions, does not properly validate user-supplied sizes for match or target extensions. An attacker providing a size smaller than expected by an extension can cause the kernel to perform an out-of-bounds read, potentially leading to information disclosure or a denial of service (DoS).
Package: kernel (Red Hat Enterprise Linux 10) - Fix deferred
Package: kernel (Red Hat Enterprise Linux 6) - Out of support scope
Package: kernel (Red Hat Enterprise Linux 7) - Fix deferred
Package: kernel-rt (Red Hat Enterprise Linux 7) - Fix deferred
Package: kernel (Red Hat Enterprise Linux 8)
GHSA
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
ghsa_unreviewed·2026-06-24
CVE-2026-52927 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
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 compatibi
No detection rules found.
No public exploits indexed.
https://git.kernel.org/stable/c/21af4c030567d2e6c89bb927bc18b51fba52a400https://git.kernel.org/stable/c/7ad0e463fc7eafae2141cc38054264636f8b3e94https://git.kernel.org/stable/c/a27cb7325a6c69970041c7f8541fafed5a1ea3echttps://git.kernel.org/stable/c/bf8e8eac7ede51dc318e06acef5a896dcbba7595https://git.kernel.org/stable/c/d7a8fb6f10d55a1c37b0bf8c20cca24dffd76e00https://git.kernel.org/stable/c/dad9ebf8107955bb54bd3f9cf22591b6ff37bac1https://git.kernel.org/stable/c/f438d1786d657d57790c5d138d6db3fc9fdac392https://git.kernel.org/stable/c/fcc4c043d137e7f1de4673dba1f3116e45377c67
2026-06-24
Published