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{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "FF3A2276-F204-45D0-888F-78B1900D361C", "versionEndExcluding": "6.18.20", "versionStartIncluding": "3.13.1", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "96D34333-38BE-4414-9E79-6EB764329581", "versionEndExcluding": "6.19.10", "versionStartIncluding": "6.19", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:3.13:-:*:*:*:*:*:*", "matchCriteriaId": "0F72A71E-B6B2-40F2-A21D-BF7CE1514976", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*", "matchCriteriaId": "4AE85AD8-4641-4E7C-A2F4-305E2CD9EE64", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*", "matchCriteriaId": "F666C8D8-6538-46D4-B318-87610DE64C34", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*", "matchCriteriaId": "02259FDA-961B-47BC-AE7F-93D7EC6E90C2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*", "matchCriteriaId": "58A9FEFF-C040-420D-8F0A-BFDAAA1DF258", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*", "matchCriteriaId": "1D2315C0-D46F-4F85-9754-F9E5E11374A6", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*", "matchCriteriaId": "512EE3A8-A590-4501-9A94-5D4B268D6138", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: always free skb on ieee80211_tx_prepare_skb() failure\n\nieee80211_tx_prepare_skb() has three error paths, but only two of them\nfree the skb. The first error path (ieee80211_tx_prepare() returning\nTX_DROP) does not free it, while invoke_tx_handlers() failure and the\nfragmentation check both do.\n\nAdd kfree_skb() to the first error path so all three are consistent,\nand remove the now-redundant frees in callers (ath9k, mt76,\nmac80211_hwsim) to avoid double-free.\n\nDocument the skb ownership guarantee in the function's kdoc."}], "id": "CVE-2026-23444", "lastModified": "2026-04-27T14:16:33.150", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2026-04-03T16:16:28.810", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/06e769dddcbeb3baf2ce346273b53dd61fdbecf4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3b4d27acafaeab478fd24f79ad6e593a892828b9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/50f1b690b4868923fbd242298def2fb88662f108"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d5ad6ab61cbd89afdb60881f6274f74328af3ee9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f77b51bcee7be2bb686b5f7a2d4a1921e4bdb9f4"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-401"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: wifi: mac80211: always free skb on ieee80211_tx_prepare_skb() failure", "id": "2454876", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2454876"}, "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-1341", "details": ["A flaw was found in the Linux kernel's mac80211 Wi-Fi subsystem. This vulnerability occurs because a specific error path within the `ieee80211_tx_prepare_skb()` function fails to properly release a network buffer, known as a socket buffer (skb). This inconsistency can lead to a double-free condition, where the same memory is freed multiple times. A local attacker could exploit this to cause memory corruption, potentially leading to a system crash (Denial of Service) or, in more severe scenarios, the execution of unauthorized code."], "name": "CVE-2026-23444", "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": "Out of support scope", "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": "2026-04-03T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-23444\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-23444\nhttps://lore.kernel.org/linux-cve-announce/2026040314-CVE-2026-23444-8169@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[06be6b149f7e406bcf16098567f5a6c9f042bced,06e769dddcbeb3baf2ce346273b53dd61fdbecf4)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[06be6b149f7e406bcf16098567f5a6c9f042bced,50f1b690b4868923fbd242298def2fb88662f108)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[06be6b149f7e406bcf16098567f5a6c9f042bced,d5ad6ab61cbd89afdb60881f6274f74328af3ee9)"}}], "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": "3.13"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,3.13)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.20,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.19.10,6.20.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0-rc5,*]"}}], "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": "2026-04-28T08:54:18.837379+00:00", "value": {"mitigation_remediation": ["Apply the latest Linux kernel update that incorporates the skb free correction.", "If an update cannot be applied immediately, disable the WiFi subsystem or corresponding drivers until a patch is available.", "For systems using custom or older kernels, consult the vendor or distribution\u2019s security page for updated patches."], "summary": {"action": "Immediate Patch", "impact": "Potential double\u2011free leading to kernel instability"}, "threat_synthesis": {"affected_systems": "The vulnerability affects the Linux kernel\u2019s mac80211 Wi\u2011Fi stack, including drivers such as ath9k, mt76, and mac80211_hwsim. All kernel releases before the applied fix are potentially impacted; no specific versions were listed.", "description_and_impact": "The kernel function ieee80211_tx_prepare_skb() inconsistently frees the network buffer across its error paths, creating an opportunity for a double\u2011free. This memory corruption can cause a kernel panic or crash, disrupting availability and compromising system stability.", "risk_and_exploitability": "With a CVSS score of 7.8 and an EPSS probability under 1%, the likelihood of exploitation is considered low, and the vulnerability is not currently listed in the CISA KEV catalog. The attack vector is inferred to be local or remote via a crafted Wi\u2011Fi transmission that triggers the erroneous return path, potentially leading to a double\u2011free scenario and kernel instability."}}}}, "created": "2026-04-03T21:13:54.086110+00:00", "updated": "2026-04-28T09:00:06.533595+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}