Skip to content
Heist/ feed
Back to feed
UnratedFix available

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

Type: advisorySources: OSV

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.

Products
Kernel
Affected versions
Not specified
Fixed versions
5.10.253, 5.15.203, 6.1.167, 6.12.78, 6.18.19, 6.19.9, 6.6.130
CVEs
CVE-2026-43453
Confirmed fixed CVEs
Not specified
Updated in this feed
5 Nov 2026, 01:00 UTC · Revision 1

Source evidence

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

core-osv · Original source

Published 8 May 2026, 14:22 UTC

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.

osv:CVE-2026-43453

Kernel

Fixed versions: 5.10.253, 5.15.203, 6.1.167, 6.6.130, 6.12.78, 6.18.19, 6.19.9

Complete source record
{
  "id": "dd00031c03c063b7e01949b9c9529f54d73940157f89d4792aadfde88ad282bd",
  "url": "https://osv.dev/vulnerability/CVE-2026-43453",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "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.",
    "evidence": "osv:CVE-2026-43453",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.253",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.203",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.167",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.130",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.78",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.19",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.19.9",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-43453",
      "aliases": [
        "CVE-2026-43453"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "3c4287f62044a90e73a561aa05fc46e62da173da"
                },
                {
                  "fixed": "1957e793196e7f8557374fd4eda53abcbb42e1c0"
                },
                {
                  "fixed": "57fb87ca095d5127cd7a27583b8ec43dcf7c9e9e"
                },
                {
                  "fixed": "60c1d18781e37bfb96290b86510eb01c5fa24d75"
                },
                {
                  "fixed": "0a55d62cdb628923d8a21724374a70c76ac7d19d"
                },
                {
                  "fixed": "dfbdac719198778b581bc0dd055df2542edb8c62"
                },
                {
                  "fixed": "e047f6fbb975f685d6c9fcef95b3b7787a79b46d"
                },
                {
                  "fixed": "324b749aa5b2d516ccfab933df9d3f56e7807f5f"
                },
                {
                  "fixed": "d6d8cd2db236a9dd13dbc2d05843b3445cc964b5"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43453.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.6.0"
                },
                {
                  "fixed": "5.10.253"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.203"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.167"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.130"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.78"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.19"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "6.19.9"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-43453.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:41.428189573Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0a55d62cdb628923d8a21724374a70c76ac7d19d",
        "https://git.kernel.org/stable/c/1957e793196e7f8557374fd4eda53abcbb42e1c0",
        "https://git.kernel.org/stable/c/324b749aa5b2d516ccfab933df9d3f56e7807f5f",
        "https://git.kernel.org/stable/c/57fb87ca095d5127cd7a27583b8ec43dcf7c9e9e",
        "https://git.kernel.org/stable/c/60c1d18781e37bfb96290b86510eb01c5fa24d75",
        "https://git.kernel.org/stable/c/d6d8cd2db236a9dd13dbc2d05843b3445cc964b5",
        "https://git.kernel.org/stable/c/dfbdac719198778b581bc0dd055df2542edb8c62",
        "https://git.kernel.org/stable/c/e047f6fbb975f685d6c9fcef95b3b7787a79b46d",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43453.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-43453",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43453.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-43453",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 508844,
  "published_at": "2026-05-08T14:22:18.087+00:00"
}