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
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)
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  }
}


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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.