Linux Kernel up to 7.0.12 netfilter _eval stack-based overflow

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6.6	$0-$5k	0.89

Summaryinfo

A vulnerability has been found in Linux Kernel up to 7.0.12 and classified as critical. Affected is the function _eval of the component netfilter. The manipulation leads to stack-based overflow. This vulnerability is documented as CVE-2026-53134. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 7.0.12. This issue affects the function _eval of the component netfilter. The manipulation with an unknown input leads to a stack-based overflow vulnerability. Using CWE to declare the problem leads to CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). Impacted is confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_fib: fix stale stack leak via the OIFNAME register For NFT_FIB_RESULT_OIFNAME the destination register is declared with len = IFNAMSIZ (four 32-bit registers), but on the lookup-fail, RTN_LOCAL and oif-mismatch paths nft_fib{4,6}_eval() only writes one register via "*dest = 0". The remaining three registers are left as whatever was on the stack in nft_do_chain()'s struct nft_regs, and a downstream expression that loads the register span can leak that uninitialised kernel stack to userspace. The NFTA_FIB_F_PRESENT existence check has the same shape: it is only meaningful for NFT_FIB_RESULT_OIF, yet it was accepted for any result type while the eval stores a single byte via nft_reg_store8(), leaving the rest of the declared span stale. Fix both: - replace the bare "*dest = 0" in the eval with nft_fib_store_result(), which strscpy_pad()s the whole IFNAMSIZ for OIFNAME (and is already used on the other early-return path), and - restrict NFTA_FIB_F_PRESENT to NFT_FIB_RESULT_OIF and declare its destination as a single u8, so the marked span matches the one byte the eval writes.

It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2026-53134 since 06/09/2026. The exploitation is known to be easy. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/18/2026).

The vulnerability scanner Nessus provides a plugin with the ID 327383 (Amazon Linux 2023 : bpftool6.18, kernel6.18, kernel6.18-devel (ALAS2023-2026-1925)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.94, 6.18.36 or 7.0.13 eliminates this vulnerability. Applying the patch 6744e49fe51bfba26522acc2d0e9703cb41d8e50/eca18feed38b3377a2ec5d1f22af1170c55d0171/d19ddef8c327a4773ff81f8e51027d1e0b4cf069/eb8a8124484dbc3c2b543e207da39bbccb703d31/8c84885e9790823828bb8084736ea15769b1ac16/84d8f58cf28a0415413f43ba7148f7bacd4c1b6e/3544210609f6d1db282bbdeca639104ef624c393/ab185e0c4fb82dfba6fb86f8271e06f931d9c64c is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (327383), EUVD (EUVD-2026-39339) and CERT Bund (WID-SEC-2026-2077). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

• Open Source Linux Kernel

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.10.258
• 5.15.209
• 6.1.175
• 6.6.142
• 6.12.0
• 6.12.1
• 6.12.2
• 6.12.3
• 6.12.4
• 6.12.5
• 6.12.6
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• 6.12.86
• 6.12.87
• 6.12.88
• 6.12.89
• 6.12.90
• 6.12.91
• 6.12.92
• 6.12.93
• 6.18.0
• 6.18.1
• 6.18.2
• 6.18.3
• 6.18.4
• 6.18.5
• 6.18.6
• 6.18.7
• 6.18.8
• 6.18.9
• 6.18.10
• 6.18.11
• 6.18.12
• 6.18.13
• 6.18.14
• 6.18.15
• 6.18.16
• 6.18.17
• 6.18.18
• 6.18.19
• 6.18.20
• 6.18.21
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• 6.18.31
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• 6.18.33
• 6.18.34
• 6.18.35
• 7.0.0
• 7.0.1
• 7.0.2
• 7.0.3
• 7.0.4
• 7.0.5
• 7.0.6
• 7.0.7
• 7.0.8
• 7.0.9
• 7.0.10
• 7.0.11
• 7.0.12

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

• 🔒
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CPE 2.2info

• 🔒
• 🔒
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CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.8
VulDB Meta Temp Score: 6.6

VulDB Base Score: 8.0
VulDB Temp Score: 7.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔒

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Stack-based overflow
CWE: CWE-121 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 327383
Nessus Name: Amazon Linux 2023 : bpftool6.18, kernel6.18, kernel6.18-devel (ALAS2023-2026-1925)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.259/5.15.210/6.1.176/6.6.143/6.12.94/6.18.36/7.0.13
Patch: 6744e49fe51bfba26522acc2d0e9703cb41d8e50/eca18feed38b3377a2ec5d1f22af1170c55d0171/d19ddef8c327a4773ff81f8e51027d1e0b4cf069/eb8a8124484dbc3c2b543e207da39bbccb703d31/8c84885e9790823828bb8084736ea15769b1ac16/84d8f58cf28a0415413f43ba7148f7bacd4c1b6e/3544210609f6d1db282bbdeca639104ef624c393/ab185e0c4fb82dfba6fb86f8271e06f931d9c64c

Timelineinfo

06/09/2026 CVE reserved
06/25/2026 +16 days Advisory disclosed
06/25/2026 +0 days VulDB entry created
07/18/2026 +23 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-53134 (🔒)
GCVE (CVE): GCVE-0-2026-53134
GCVE (VulDB): GCVE-100-373691
EUVD: 🔒
CERT Bund: WID-SEC-2026-2077 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 06/25/2026 11:44
Updated: 07/18/2026 11:22
Changes: 06/25/2026 11:44 (59), 06/25/2026 14:20 (1), 06/28/2026 22:58 (7), 07/08/2026 07:15 (11), 07/18/2026 11:22 (2)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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