NVD / CVE Program· CNA Linux

CVE-2026-43453: netfilter: nft_set_pipapo: fix stack out-of-bounds read in pipapo_drop()

HighCVSS 7.1 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 28/100)

The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
Probability of exploitation in the next 30 days: 0.12% (FIRST EPSS).
Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
Fixed version: Linux Linux 0a55d62cdb628923d8a21724374a70c76ac7d19d, 1957e793196e7f8557374fd4eda53abcbb42e1c0, 324b749aa5b2d516ccfab933df9d3f56e7807f5f.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 0a55d62cdb628923d8a21724374a70c76ac7d19d, 1957e793196e7f8557374fd4eda53abcbb42e1c0, 324b749aa5b2d516ccfab933df9d3f56e7807f5f or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_set_pipapo: fix stack out-of-bounds read in pipapo_drop() pipapo_drop() passes rulemap[i + 1].n to pipapo_unmap() as the to_offset argument on every iteration, including the last one where i == m->field_count - 1. This reads one element past the end of the stack-allocated rulemap array (declared as rulemap[NFT_PIPAPO_MAX_FIELDS] with NFT_PIPAPO_MAX_FIELDS == 16). Although pipapo_unmap() returns early when is_last is true without using the to_offset value, the argument is evaluated at the call site before the function body executes, making this a genuine out-of-bounds stack read confirmed by KASAN: BUG: KASAN: stack-out-of-bounds in pipapo_drop+0x50c/0x57c [nf_tables] Read of size 4 at addr ffff8000810e71a4 This frame has 1 object: [32, 160) 'rulemap' The buggy address is at offset 164 -- exactly 4 bytes past the end of the rulemap array. Pass 0 instead of rulemap[i + 1].n on the last iteration to avoid the out-of-bounds read.

Memory safety

BDU:2026-14149

Published: May 8, 2026
Updated: Nov 11, 2026
EPSS: 0.1% · 2th percentile
CWE: CWE-125

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 28 / 40 · 7.1 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.1%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

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No public exploit code on record
A fix has been released

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Noroxi analysis

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
linux	linux kernel	cpe:2.3:o:linux:linux_kernel

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

Linux Linux
- 5.6affected
- 3c4287f62044a90e73a561aa05fc46e62da173da and later · before 1957e793196e7f8557374fd4eda53abcbb42e1c0affected · git
- 3c4287f62044a90e73a561aa05fc46e62da173da and later · before 57fb87ca095d5127cd7a27583b8ec43dcf7c9e9eaffected · git
- 3c4287f62044a90e73a561aa05fc46e62da173da and later · before 60c1d18781e37bfb96290b86510eb01c5fa24d75affected · git
- 3c4287f62044a90e73a561aa05fc46e62da173da and later · before 0a55d62cdb628923d8a21724374a70c76ac7d19daffected · git
- 3c4287f62044a90e73a561aa05fc46e62da173da and later · before dfbdac719198778b581bc0dd055df2542edb8c62affected · git
- 3c4287f62044a90e73a561aa05fc46e62da173da and later · before e047f6fbb975f685d6c9fcef95b3b7787a79b46daffected · git
- 3c4287f62044a90e73a561aa05fc46e62da173da and later · before 324b749aa5b2d516ccfab933df9d3f56e7807f5faffected · git
- 3c4287f62044a90e73a561aa05fc46e62da173da and later · before d6d8cd2db236a9dd13dbc2d05843b3445cc964b5affected · git
- before 5.6not affected · semver

Affected versions · NVD (8)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

linux linux kernel5.6 and later · before 5.10.253
linux linux kernel5.11 and later · before 5.15.203
linux linux kernel5.16 and later · before 6.1.167
linux linux kernel6.2 and later · before 6.6.130
linux linux kernel6.7 and later · before 6.12.78
linux linux kernel6.13 and later · before 6.18.19
linux linux kernel6.19 and later · before 6.19.9
linux linux kernel7.0

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
Debian:12	linux	before 6.1.170-1	6.1.170-1
Debian:13	linux	before 6.12.85-1	6.12.85-1
Debian:14	linux	before 6.19.10-1	6.19.10-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
90Now
CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe…KEV
89Now
CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
85Now

Published before and after this one in the same product

← EarlierCVE-2026-43451May 8, 2026 · netfilter: nfnetlink_queue: fix entry leak in bridge verdict error path
22Monitor
← EarlierCVE-2026-43452May 8, 2026 · netfilter: x_tables: guard option walkers against 1-byte tail reads
32Monitor
Later →CVE-2026-43454May 8, 2026 · netfilter: nf_tables: Fix for duplicate device in netdev hooks
31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
Linux Linux	0a55d62cdb628923d8a21724374a70c76ac7d19d	Vendor (CNA)
Linux Linux	1957e793196e7f8557374fd4eda53abcbb42e1c0	Vendor (CNA)
Linux Linux	324b749aa5b2d516ccfab933df9d3f56e7807f5f	Vendor (CNA)
Linux Linux	57fb87ca095d5127cd7a27583b8ec43dcf7c9e9e	Vendor (CNA)
Linux Linux	60c1d18781e37bfb96290b86510eb01c5fa24d75	Vendor (CNA)
Linux Linux	d6d8cd2db236a9dd13dbc2d05843b3445cc964b5	Vendor (CNA)
Linux Linux	dfbdac719198778b581bc0dd055df2542edb8c62	Vendor (CNA)
Linux Linux	e047f6fbb975f685d6c9fcef95b3b7787a79b46d	Vendor (CNA)
debian:linux	6.1.170-1 · Debian:12	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.