VulnerabilityPublished 27 May 2026Updated 6 Nov 2026

CVE-2026-46101: Linux kernel · netfilter: reject zero shift in nft_bitwise

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in fe11e5c40817b84abaa5d83bfb6586d8412bfd07 : update Linux kernel when convenient.

Data as of 6 Nov 2026, 16:34 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch

Available – fixed in fe11e5c40817b84abaa5d83bfb6586d8412bfd07, f370205974f171a5868c13ff30d7642fed46e47b, ca24f1243ad1a4d12d6a23876bbbe3ed02099853 +5

Exploitation evidence

Disclosed: evidence found.
CVE published 27 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 567d746b55bc66d3800c9ae91d50f0c5deb2fd93, < fe11e5c40817b84abaa5d83bfb6586d8412bfd07	Fixed in fe11e5c40817b84abaa5d83bfb6586d8412bfd07
LinuxLinux	Affected ≥ 567d746b55bc66d3800c9ae91d50f0c5deb2fd93, < f370205974f171a5868c13ff30d7642fed46e47b	Fixed in f370205974f171a5868c13ff30d7642fed46e47b
LinuxLinux	Affected ≥ 567d746b55bc66d3800c9ae91d50f0c5deb2fd93, < ca24f1243ad1a4d12d6a23876bbbe3ed02099853	Fixed in ca24f1243ad1a4d12d6a23876bbbe3ed02099853
LinuxLinux	Affected ≥ 567d746b55bc66d3800c9ae91d50f0c5deb2fd93, < bffef0acec9c3b837a785248a893137fb7f26c95	Fixed in bffef0acec9c3b837a785248a893137fb7f26c95
LinuxLinux	Affected ≥ 567d746b55bc66d3800c9ae91d50f0c5deb2fd93, < 9baa08d6b6b096fad70049533f0d705d85fdc979	Fixed in 9baa08d6b6b096fad70049533f0d705d85fdc979
LinuxLinux	Affected ≥ 567d746b55bc66d3800c9ae91d50f0c5deb2fd93, < 9ad26c272405f53834871cc2e46b9b5393a666c3	Fixed in 9ad26c272405f53834871cc2e46b9b5393a666c3

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: reject zero shift in nft_bitwise Reject zero shift operands for nft_bitwise left and right shift expressions during initialization. The carry propagation logic computes the carry from the adjacent 32-bit word using BITS_PER_TYPE(u32) - shift. A zero shift operand turns this into a 32-bit shift, which is undefined behaviour. Reject zero shift operands in the control plane, alongside the existing check for values greater than or equal to 32, so malformed rules never reach the packet path.

References

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