Linux Kernel up to 7.3-rc3 Netfilter nft_nat_setup_netmap uninitialized variable

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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9.5$0-$5k1.12-

Summaryinfo

A vulnerability has been found in Linux Kernel up to 7.3-rc3 and classified as very critical. Affected by this vulnerability is the function nft_nat_setup_netmap of the component Netfilter. Performing a manipulation results in uninitialized variable. This vulnerability is cataloged as CVE-2026-98322. It is possible to initiate the attack remotely. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.3-rc3. It has been classified as very critical. This affects the function nft_nat_setup_netmap of the component Netfilter. The manipulation with an unknown input leads to a uninitialized variable vulnerability. CWE is classifying the issue as CWE-457. The code uses a variable that has not been initialized, leading to unpredictable or unintended results. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_nat: fully initialise new_addr in netmap setup nft_nat_setup_netmap() builds the mapped address in an on-stack union nf_inet_addr. For an IPv4 mapping it writes only the 4-byte .ip member and the loop runs a single 32-bit iteration, but it then copies the whole 16-byte union into range->min_addr and range->max_addr, so the upper 12 bytes reach nf_nat_setup_info() uninitialised. KMSAN reports an uninit-value in nf_nat_setup_info() reached from nft_nat_eval(). The IPv6 path fills all 16 bytes and is not affected. Zero-initialise new_addr.

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-98322 since 09/25/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 10/06/2026).

Upgrading to version 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.112, 6.18.54, 7.2.8 or 7.3-rc4 eliminates this vulnerability. Applying the patch 29365695842db0a97b701a43a09fad1b4f7ecf3e/7b9380c38c2fd2189416fa602bdbc5c8523b84b2/eb2030137dba3b59cbb5057a33af70488d6bc231/e4982c489ee359162eee3ece1fb36082648464a5/161f5860c92a8ec80b6bdff16e79d70dcd8afc5a/0ce42c7b84032335abff9eac43762e4ca8224451/1c43f5db482f74b41987c39c9c375a5e767556eb/d313499df66159b4b7971d760d16729598ab7e5a is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.9
VulDB Meta Temp Score: 9.5

VulDB Base Score: 9.9
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Uninitialized variable
CWE: CWE-457 / CWE-453
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.271/5.15.222/6.1.189/6.6.158/6.12.112/6.18.54/7.2.8/7.3-rc4
Patch: 29365695842db0a97b701a43a09fad1b4f7ecf3e/7b9380c38c2fd2189416fa602bdbc5c8523b84b2/eb2030137dba3b59cbb5057a33af70488d6bc231/e4982c489ee359162eee3ece1fb36082648464a5/161f5860c92a8ec80b6bdff16e79d70dcd8afc5a/0ce42c7b84032335abff9eac43762e4ca8224451/1c43f5db482f74b41987c39c9c375a5e767556eb/d313499df66159b4b7971d760d16729598ab7e5a

Timelineinfo

09/25/2026 CVE reserved
10/06/2026 +11 days Advisory disclosed
10/06/2026 +0 days VulDB entry created
10/06/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-98322 (🔒)
GCVE (CVE): GCVE-0-2026-98322
GCVE (VulDB): GCVE-100-414249

Entryinfo

Created: 10/06/2026 14:01
Changes: 10/06/2026 14:01 (59)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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