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CVE-2026-43453 (GCVE-0-2026-43453)

Vulnerability from cvelistv5 – Published: 2026-05-08 14:22 – Updated: 2026-05-11 22:24
VLAI
Title
netfilter: nft_set_pipapo: fix stack out-of-bounds read in pipapo_drop()
Summary
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.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 3c4287f62044a90e73a561aa05fc46e62da173da , < 1957e793196e7f8557374fd4eda53abcbb42e1c0 (git)
Affected: 3c4287f62044a90e73a561aa05fc46e62da173da , < 57fb87ca095d5127cd7a27583b8ec43dcf7c9e9e (git)
Affected: 3c4287f62044a90e73a561aa05fc46e62da173da , < 60c1d18781e37bfb96290b86510eb01c5fa24d75 (git)
Affected: 3c4287f62044a90e73a561aa05fc46e62da173da , < 0a55d62cdb628923d8a21724374a70c76ac7d19d (git)
Affected: 3c4287f62044a90e73a561aa05fc46e62da173da , < dfbdac719198778b581bc0dd055df2542edb8c62 (git)
Affected: 3c4287f62044a90e73a561aa05fc46e62da173da , < e047f6fbb975f685d6c9fcef95b3b7787a79b46d (git)
Affected: 3c4287f62044a90e73a561aa05fc46e62da173da , < 324b749aa5b2d516ccfab933df9d3f56e7807f5f (git)
Affected: 3c4287f62044a90e73a561aa05fc46e62da173da , < d6d8cd2db236a9dd13dbc2d05843b3445cc964b5 (git)
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Linux Linux Affected: 5.6
Unaffected: 0 , < 5.6 (semver)
Unaffected: 5.10.253 , ≤ 5.10.* (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.167 , ≤ 6.1.* (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.78 , ≤ 6.12.* (semver)
Unaffected: 6.18.19 , ≤ 6.18.* (semver)
Unaffected: 6.19.9 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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    "redhat_vex": {
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      "id": "CVE-2026-43453",
      "initial_release_date": "2026-05-08T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: netfilter: nft_set_pipapo: fix stack out-of-bounds read in pipapo_drop()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43453.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-05-12T03:29:56Z",
      "cve": "CVE-2026-43453",
      "id": "CVE-2026-43453",
      "initial_release_date": "2026-05-11T14:13:29Z",
      "product_status:known_affected": "181",
      "product_status:known_not_affected": "45",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-43453",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-43453.json",
      "version": "3"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.