{"id":"CVE-2026-43453","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:\n\nnetfilter: nft_set_pipapo: fix stack out-of-bounds read in pipapo_drop()\n\npipapo_drop() passes rulemap[i + 1].n to pipapo_unmap() as the\nto_offset argument on every ite…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 3c4287f62044a90e73a561aa05fc46e62da173da < 1957e793196e7f8557374fd4eda53abcbb42e1c0","Linux >= 3c4287f62044a90e73a561aa05fc46e62da173da < 57fb87ca095d5127cd7a27583b8ec43dcf7c9e9e","Linux >= 3c4287f62044a90e73a561aa05fc46e62da173da < 60c1d18781e37bfb96290b86510eb01c5fa24d75","Linux >= 3c4287f62044a90e73a561aa05fc46e62da173da < 0a55d62cdb628923d8a21724374a70c76ac7d19d","Linux >= 3c4287f62044a90e73a561aa05fc46e62da173da < dfbdac719198778b581bc0dd055df2542edb8c62","Linux >= 3c4287f62044a90e73a561aa05fc46e62da173da < e047f6fbb975f685d6c9fcef95b3b7787a79b46d","Linux >= 3c4287f62044a90e73a561aa05fc46e62da173da < 324b749aa5b2d516ccfab933df9d3f56e7807f5f","Linux >= 3c4287f62044a90e73a561aa05fc46e62da173da < d6d8cd2db236a9dd13dbc2d05843b3445cc964b5","Linux 5.6"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T15:39:22.846644Z"},"published":"2026-05-08","updated":"2026-11-06","sourceUpdated":"2026-11-06T15:42:55.723Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-43453","references":[{"url":"https://git.kernel.org/stable/c/1957e793196e7f8557374fd4eda53abcbb42e1c0"},{"url":"https://git.kernel.org/stable/c/57fb87ca095d5127cd7a27583b8ec43dcf7c9e9e"},{"url":"https://git.kernel.org/stable/c/60c1d18781e37bfb96290b86510eb01c5fa24d75"},{"url":"https://git.kernel.org/stable/c/0a55d62cdb628923d8a21724374a70c76ac7d19d"},{"url":"https://git.kernel.org/stable/c/dfbdac719198778b581bc0dd055df2542edb8c62"},{"url":"https://git.kernel.org/stable/c/e047f6fbb975f685d6c9fcef95b3b7787a79b46d"},{"url":"https://git.kernel.org/stable/c/324b749aa5b2d516ccfab933df9d3f56e7807f5f"},{"url":"https://git.kernel.org/stable/c/d6d8cd2db236a9dd13dbc2d05843b3445cc964b5"}],"tags":["cve.org"],"epss":0.00126,"epssPercentile":0.02283,"ingestedAt":"2026-11-06T15:54:03.905Z","slug":"CVE-2026-43453","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_set_pipapo: fix stack out-of-bounds read in pipapo_drop()\n\npipapo_drop() passes rulemap[i + 1].n to pipapo_unmap() as the\nto_offset argument on every iteration, including the last one where\ni == m->field_count - 1. This reads one element past the end of the\nstack-allocated rulemap array (declared as rulemap[NFT_PIPAPO_MAX_FIELDS]\nwith NFT_PIPAPO_MAX_FIELDS == 16).\n\nAlthough pipapo_unmap() returns early when is_last is true without\nusing the to_offset value, the argument is evaluated at the call site\nbefore the function body executes, making this a genuine out-of-bounds\nstack read confirmed by KASAN:\n\n  BUG: KASAN: stack-out-of-bounds in pipapo_drop+0x50c/0x57c [nf_tables]\n  Read of size 4 at addr ffff8000810e71a4\n\n  This frame has 1 object:\n   [32, 160) 'rulemap'\n\n  The buggy address is at offset 164 -- exactly 4 bytes past the end\n  of the rulemap array.\n\nPass 0 instead of rulemap[i + 1].n on the last iteration to avoid\nthe out-of-bounds read.\n\n## Affected\n\n- `Linux >= 3c4287f62044a90e73a561aa05fc46e62da173da < 1957e793196e7f8557374fd4eda53abcbb42e1c0`\n- `Linux >= 3c4287f62044a90e73a561aa05fc46e62da173da < 57fb87ca095d5127cd7a27583b8ec43dcf7c9e9e`\n- `Linux >= 3c4287f62044a90e73a561aa05fc46e62da173da < 60c1d18781e37bfb96290b86510eb01c5fa24d75`\n- `Linux >= 3c4287f62044a90e73a561aa05fc46e62da173da < 0a55d62cdb628923d8a21724374a70c76ac7d19d`\n- `Linux >= 3c4287f62044a90e73a561aa05fc46e62da173da < dfbdac719198778b581bc0dd055df2542edb8c62`\n- `Linux >= 3c4287f62044a90e73a561aa05fc46e62da173da < e047f6fbb975f685d6c9fcef95b3b7787a79b46d`\n- `Linux >= 3c4287f62044a90e73a561aa05fc46e62da173da < 324b749aa5b2d516ccfab933df9d3f56e7807f5f`\n- `Linux >= 3c4287f62044a90e73a561aa05fc46e62da173da < d6d8cd2db236a9dd13dbc2d05843b3445cc964b5`\n- `Linux 5.6`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}