{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-23272", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-01-13T15:37:45.991Z", "datePublished": "2026-03-20T08:08:52.946Z", "dateUpdated": "2026-03-20T08:08:52.946Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-03-20T08:08:52.946Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: unconditionally bump set->nelems before insertion\n\nIn case that the set is full, a new element gets published then removed\nwithout waiting for the RCU grace period, while RCU reader can be\nwalking over it already.\n\nTo address this issue, add the element transaction even if set is full,\nbut toggle the set_full flag to report -ENFILE so the abort path safely\nunwinds the set to its previous state.\n\nAs for element updates, decrement set->nelems to restore it.\n\nA simpler fix is to call synchronize_rcu() in the error path.\nHowever, with a large batch adding elements to already maxed-out set,\nthis could cause noticeable slowdown of such batches."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/netfilter/nf_tables_api.c"], "versions": [{"version": "35d0ac9070ef619e3bf44324375878a1c540387b", "lessThan": "6826131c7674329335ca25df2550163eb8a1fd0c", "status": "affected", "versionType": "git"}, {"version": "35d0ac9070ef619e3bf44324375878a1c540387b", "lessThan": "ccb8c8f3c1127cf34d18c737309897c68046bf21", "status": "affected", "versionType": "git"}, {"version": "35d0ac9070ef619e3bf44324375878a1c540387b", "lessThan": "def602e498a4f951da95c95b1b8ce8ae68aa733a", "status": "affected", "versionType": "git"}, {"version": "fefdd79403e89b0c673965343b92e2e01e2713a8", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/netfilter/nf_tables_api.c"], "versions": [{"version": "4.10", "status": "affected"}, {"version": "0", "lessThan": "4.10", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.17", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.7", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0-rc3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.10", "versionEndExcluding": "6.18.17"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.10", "versionEndExcluding": "6.19.7"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.10", "versionEndExcluding": "7.0-rc3"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9.33"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/6826131c7674329335ca25df2550163eb8a1fd0c"}, {"url": "https://git.kernel.org/stable/c/ccb8c8f3c1127cf34d18c737309897c68046bf21"}, {"url": "https://git.kernel.org/stable/c/def602e498a4f951da95c95b1b8ce8ae68aa733a"}], "title": "netfilter: nf_tables: unconditionally bump set->nelems before insertion", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: unconditionally bump set->nelems before insertion\n\nIn case that the set is full, a new element gets published then removed\nwithout waiting for the RCU grace period, while RCU reader can be\nwalking over it already.\n\nTo address this issue, add the element transaction even if set is full,\nbut toggle the set_full flag to report -ENFILE so the abort path safely\nunwinds the set to its previous state.\n\nAs for element updates, decrement set->nelems to restore it.\n\nA simpler fix is to call synchronize_rcu() in the error path.\nHowever, with a large batch adding elements to already maxed-out set,\nthis could cause noticeable slowdown of such batches."}], "id": "CVE-2026-23272", "lastModified": "2026-03-20T13:37:50.737", "metrics": {}, "published": "2026-03-20T09:16:12.700", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6826131c7674329335ca25df2550163eb8a1fd0c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ccb8c8f3c1127cf34d18c737309897c68046bf21"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/def602e498a4f951da95c95b1b8ce8ae68aa733a"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Awaiting Analysis"}

{"bugzilla": {"description": "kernel: netfilter: nf_tables: unconditionally bump set->nelems before insertion", "id": "2449571", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2449571"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-367", "details": ["A flaw was found in the Linux kernel's netfilter nf_tables component. A race condition occurs when elements are inserted into a full set, causing an element to be removed without proper synchronization with Read-Copy-Update (RCU) readers. This can allow a local attacker to trigger a use-after-free vulnerability, potentially leading to a denial of service or other unspecified impacts."], "name": "CVE-2026-23272", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-03-20T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-23272\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23272\nhttps://lore.kernel.org/linux-cve-announce/2026032034-CVE-2026-23272-8ad1@gregkh/T"], "statement": "This vulnerability affects systems using nf_tables for packet filtering with sets that have size limits. When a set reaches capacity, the race between element insertion/removal and RCU readers creates a window for use-after-free. Exploitation requires the ability to configure nf_tables rules, which typically requires CAP_NET_ADMIN privileges or root access.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[35d0ac9070ef619e3bf44324375878a1c540387b,6826131c7674329335ca25df2550163eb8a1fd0c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[35d0ac9070ef619e3bf44324375878a1c540387b,ccb8c8f3c1127cf34d18c737309897c68046bf21)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[35d0ac9070ef619e3bf44324375878a1c540387b,def602e498a4f951da95c95b1b8ce8ae68aa733a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "fefdd79403e89b0c673965343b92e2e01e2713a8"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "4.10"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,4.10)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.17,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.19.7,6.19.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0-rc3,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "analysis": {"en": {"generated_at": "2026-03-20T11:51:58.252227+00:00", "value": {"mitigation_remediation": ["Apply a kernel update that includes the nf_tables set insertion fix (the patch referenced by commit 6826131c7674329335ca25df2550163eb8a1fd0c).", "If an immediate kernel upgrade is not feasible, limit nf_tables usage or reduce the number of set entries to avoid reaching the set\u2019s maximum capacity, thus preventing the race condition from occurring."], "summary": {"action": "Immediate Patch", "impact": "Memory Corruption / Denial of Service"}, "threat_synthesis": {"affected_systems": "All Linux kernel releases that contain the legacy nf_tables implementation are potentially affected, as indicated by the CPE: cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*. No specific version range was disclosed in the CVE report; any kernel build that does not include the patch referenced by the commit hashes (6826131c7674329335ca25df2550163eb8a1fd0c, CCB8C8F3C1127CF34D18C737309897C68046BF21, DEF602E498A4F951DA95C95B1B8CE8AE68AA733A) remains vulnerable.", "description_and_impact": "The vulnerability is a race condition in the Linux kernel\u2019s netfilter nf_tables component. When a set is already full, the code unconditionally increments set->nelems before attempting to insert a new element. The new element is published and then removed without waiting for the RCU grace period, which can happen while an RCU reader is traversing the set. This race can cause a use\u2011after\u2011free or memory corruption, potentially crashing the kernel and causing a denial of service. The weakness is identified as CWE\u2011362 (Race Condition) and CWE\u2011416 (Use After Free).", "risk_and_exploitability": "The CVSS score is not provided and EPSS data is unavailable, so a quantitative risk assessment cannot be supplied. However, the vulnerability can lead to kernel crashes, which represent a high\u2011impact risk to availability. Based on the description, it is inferred that an attacker with the ability to create many nf_tables set entries (e.g., via crafted network traffic or local manipulation of netfilter tables) could trigger this race condition. The CVE does not list the vulnerability in CISA\u2019s KEV catalog and no public exploits are noted, but the potential for a denial of service warrants prompt remediation."}}}}, "created": "2026-03-20T10:36:46.865781+00:00", "updated": "2026-03-20T16:27:51.720517+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}