CVE-2026-72252 - Vulnerability Details

Vendors	Products
Linux	Linux Kernel

Link	Providers
https://git.kernel.org/stable/c/02b6b0e892aea582590671796fd6eff5b93ea93f
https://git.kernel.org/stable/c/047e813324eac2ac60cddfb58bcdbd0144eadb09
https://git.kernel.org/stable/c/47e65eff50691f0a5b79d325e28d83ec1da43bcf
https://git.kernel.org/stable/c/610e3b73efaec3dd81a95dcda2421ad7d9795bd0
https://git.kernel.org/stable/c/e74f9680e1b64872a51cc7b5bda1edaaa08aa51f

Type	Values Removed	Values Added
Description		In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_set_pipapo: don't leak bad clone into future transaction On memory allocation failure the cloned nft_pipapo_match can enter a bad state: - some fields can have their lookup tables resized while others did not - bits might have been toggled - scratch map can be undersized which also means m->bsize_max can be lower than what is required This means that the next insertion in the same batch can trigger out-of-bounds writes. Furthermore, a failure in the first can result in the bad clone to leak into the next transaction because the abort callback is never executed in this case (the upper layer saw an error and no attempt to allocate a transactional request was made). Record a state for the nft_pipapo_match structure: - NEW (pristine clone) - MOD (modified clone with good state) - ERR (potentially bogus content) Then make it so that deletes and insertions fail when the clone entered ERR state. In case the very first insert attempt results in an error, free the clone right away.
Title		netfilter: nft_set_pipapo: don't leak bad clone into future transaction
First Time appeared		Linux Linux linux Kernel
CPEs		cpe:2.3:o:linux:linux_kernel::::::::
Vendors & Products		Linux Linux linux Kernel
References		https://git.kernel.org/stable/c/02b6b0e892aea582590671796fd6eff5b93ea93f https://git.kernel.org/stable/c/047e813324eac2ac60cddfb58bcdbd0144eadb09 https://git.kernel.org/stable/c/47e65eff50691f0a5b79d325e28d83ec1da43bcf https://git.kernel.org/stable/c/610e3b73efaec3dd81a95dcda2421ad7d9795bd0 https://git.kernel.org/stable/c/e74f9680e1b64872a51cc7b5bda1edaaa08aa51f

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/netfilter/nft_set_pipapo.c", "net/netfilter/nft_set_pipapo.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "047e813324eac2ac60cddfb58bcdbd0144eadb09", "status": "affected", "version": "3c4287f62044a90e73a561aa05fc46e62da173da", "versionType": "git"}, {"lessThan": "610e3b73efaec3dd81a95dcda2421ad7d9795bd0", "status": "affected", "version": "3c4287f62044a90e73a561aa05fc46e62da173da", "versionType": "git"}, {"lessThan": "02b6b0e892aea582590671796fd6eff5b93ea93f", "status": "affected", "version": "3c4287f62044a90e73a561aa05fc46e62da173da", "versionType": "git"}, {"lessThan": "e74f9680e1b64872a51cc7b5bda1edaaa08aa51f", "status": "affected", "version": "3c4287f62044a90e73a561aa05fc46e62da173da", "versionType": "git"}, {"lessThan": "47e65eff50691f0a5b79d325e28d83ec1da43bcf", "status": "affected", "version": "3c4287f62044a90e73a561aa05fc46e62da173da", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/netfilter/nft_set_pipapo.c", "net/netfilter/nft_set_pipapo.h"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.6"}, {"lessThan": "5.6", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.148", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.97", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.40", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2-rc2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_set_pipapo: don't leak bad clone into future transaction\n\nOn memory allocation failure the cloned nft_pipapo_match can enter a bad\nstate:\n - some fields can have their lookup tables resized while others did\n not\n - bits might have been toggled\n - scratch map can be undersized which also means m->bsize_max can be\n lower than what is required\n\nThis means that the next insertion in the same batch can trigger\nout-of-bounds writes.\n\nFurthermore, a failure in the first can result in the bad clone to\nleak into the next transaction because the abort callback is never\nexecuted in this case (the upper layer saw an error and no attempt to\nallocate a transactional request was made).\n\nRecord a state for the nft_pipapo_match structure:\n- NEW (pristine clone)\n- MOD (modified clone with good state)\n- ERR (potentially bogus content)\n\nThen make it so that deletes and insertions fail when the clone\nentered ERR state.\n\nIn case the very first insert attempt results in an error, free the\nclone right away."}], "id": "CVE-2026-72252", "lastModified": "2026-08-15T06:21:52.600", "metrics": {}, "published": "2026-08-15T06:21:52.600", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/02b6b0e892aea582590671796fd6eff5b93ea93f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/047e813324eac2ac60cddfb58bcdbd0144eadb09"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/47e65eff50691f0a5b79d325e28d83ec1da43bcf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/610e3b73efaec3dd81a95dcda2421ad7d9795bd0"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e74f9680e1b64872a51cc7b5bda1edaaa08aa51f"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

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