CVE-2026-23444

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-23444", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-01-13T15:37:46.019Z", "datePublished": "2026-04-03T15:15:28.464Z", "dateUpdated": "2026-10-19T18:35:43.925Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:21:47.685Z"}, "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."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable mac80211 helper is reached from local nl80211 operations such as setting wireless parameters and triggering hardware scans, not from received WiFi frames. A local attacker can drive affected scan paths through the kernel's generic netlink API.\nAC:L - The failure path can be triggered deterministically on an affected device by choosing scan parameters that produce a directed, oversized probe request with a low fragmentation threshold. No race or condition outside the attacker's control is required once the affected driver/path is available.\nPR:L - The reachable nl80211 commands are guarded by GENL_UNS_ADMIN_PERM/CAP_NET_ADMIN in the relevant network namespace, which is low privilege for CVSS purposes and can be reachable through user namespaces in plausible deployments. It does not require full init-namespace root.\nUI:N - After obtaining the needed local privileges, the attacker can issue the netlink operations directly. No separate victim action is required.\nS:U - The bug corrupts kernel networking memory within the same kernel security authority. It does not cross a VM, hypervisor, or separate security-scope boundary.\nC:H - The vulnerable failure path creates a double-free/use-after-free of an sk_buff, which is kernel heap memory corruption. Such corruption can plausibly be exploited for kernel memory disclosure, so confidentiality impact is high.\nI:H - The double-free/use-after-free can plausibly be turned into kernel heap manipulation and control-flow or data corruption. Under the required overestimate rule, this supports high integrity impact.\nA:H - Even without full exploitation, the double-free/use-after-free can trigger slab corruption, warnings, oopses, or kernel panic. Availability impact is therefore high."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/wireless/ath/ath9k/channel.c", "drivers/net/wireless/mediatek/mt76/scan.c", "drivers/net/wireless/virtual/mac80211_hwsim.c", "include/net/mac80211.h", "net/mac80211/tx.c"], "versions": [{"version": "06be6b149f7e406bcf16098567f5a6c9f042bced", "lessThan": "905ef207d5ed99ca64adfe39fba9ac46e434327a", "status": "affected", "versionType": "git"}, {"version": "06be6b149f7e406bcf16098567f5a6c9f042bced", "lessThan": "5ef8ca1c164786da24169af155c1ca1ff1353cf8", "status": "affected", "versionType": "git"}, {"version": "06be6b149f7e406bcf16098567f5a6c9f042bced", "lessThan": "9a779d1f480e83720b5384adf165604e7ee226bd", "status": "affected", "versionType": "git"}, {"version": "06be6b149f7e406bcf16098567f5a6c9f042bced", "lessThan": "f77b51bcee7be2bb686b5f7a2d4a1921e4bdb9f4", "status": "affected", "versionType": "git"}, {"version": "06be6b149f7e406bcf16098567f5a6c9f042bced", "lessThan": "3b4d27acafaeab478fd24f79ad6e593a892828b9", "status": "affected", "versionType": "git"}, {"version": "06be6b149f7e406bcf16098567f5a6c9f042bced", "lessThan": "06e769dddcbeb3baf2ce346273b53dd61fdbecf4", "status": "affected", "versionType": "git"}, {"version": "06be6b149f7e406bcf16098567f5a6c9f042bced", "lessThan": "50f1b690b4868923fbd242298def2fb88662f108", "status": "affected", "versionType": "git"}, {"version": "06be6b149f7e406bcf16098567f5a6c9f042bced", "lessThan": "d5ad6ab61cbd89afdb60881f6274f74328af3ee9", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/wireless/ath/ath9k/channel.c", "drivers/net/wireless/mediatek/mt76/scan.c", "drivers/net/wireless/virtual/mac80211_hwsim.c", "include/net/mac80211.h", "net/mac80211/tx.c"], "versions": [{"version": "3.13", "status": "affected"}, {"version": "0", "lessThan": "3.13", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.258", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.209", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.136", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.84", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.20", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.10", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "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": "3.13", "versionEndExcluding": "5.10.258"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "5.15.209"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "6.1.175"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "6.6.136"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "6.12.84"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "6.18.20"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "6.19.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/905ef207d5ed99ca64adfe39fba9ac46e434327a"}, {"url": "https://git.kernel.org/stable/c/5ef8ca1c164786da24169af155c1ca1ff1353cf8"}, {"url": "https://git.kernel.org/stable/c/9a779d1f480e83720b5384adf165604e7ee226bd"}, {"url": "https://git.kernel.org/stable/c/f77b51bcee7be2bb686b5f7a2d4a1921e4bdb9f4"}, {"url": "https://git.kernel.org/stable/c/3b4d27acafaeab478fd24f79ad6e593a892828b9"}, {"url": "https://git.kernel.org/stable/c/06e769dddcbeb3baf2ce346273b53dd61fdbecf4"}, {"url": "https://git.kernel.org/stable/c/50f1b690b4868923fbd242298def2fb88662f108"}, {"url": "https://git.kernel.org/stable/c/d5ad6ab61cbd89afdb60881f6274f74328af3ee9"}], "title": "wifi: mac80211: always free skb on ieee80211_tx_prepare_skb() failure", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"x_adpType": "supplier", "providerMetadata": {"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-10-15T01:15:05.658Z"}, "affected": [{"vendor": "Siemens", "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem", "versions": [{"status": "affected", "version": "0", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}], "references": [{"url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}]}, {"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-23444", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:08:09.371784Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-401", "description": "CWE-401 Missing Release of Memory after Effective Lifetime"}]}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-19T18:35:43.925Z"}}]}}

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-23444", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-01-13T15:37:46.019Z", "datePublished": "2026-04-03T15:15:28.464Z", "dateUpdated": "2026-10-19T18:35:43.925Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:21:47.685Z"}, "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."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable mac80211 helper is reached from local nl80211 operations such as setting wireless parameters and triggering hardware scans, not from received WiFi frames. A local attacker can drive affected scan paths through the kernel's generic netlink API.\nAC:L - The failure path can be triggered deterministically on an affected device by choosing scan parameters that produce a directed, oversized probe request with a low fragmentation threshold. No race or condition outside the attacker's control is required once the affected driver/path is available.\nPR:L - The reachable nl80211 commands are guarded by GENL_UNS_ADMIN_PERM/CAP_NET_ADMIN in the relevant network namespace, which is low privilege for CVSS purposes and can be reachable through user namespaces in plausible deployments. It does not require full init-namespace root.\nUI:N - After obtaining the needed local privileges, the attacker can issue the netlink operations directly. No separate victim action is required.\nS:U - The bug corrupts kernel networking memory within the same kernel security authority. It does not cross a VM, hypervisor, or separate security-scope boundary.\nC:H - The vulnerable failure path creates a double-free/use-after-free of an sk_buff, which is kernel heap memory corruption. Such corruption can plausibly be exploited for kernel memory disclosure, so confidentiality impact is high.\nI:H - The double-free/use-after-free can plausibly be turned into kernel heap manipulation and control-flow or data corruption. Under the required overestimate rule, this supports high integrity impact.\nA:H - Even without full exploitation, the double-free/use-after-free can trigger slab corruption, warnings, oopses, or kernel panic. Availability impact is therefore high."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/wireless/ath/ath9k/channel.c", "drivers/net/wireless/mediatek/mt76/scan.c", "drivers/net/wireless/virtual/mac80211_hwsim.c", "include/net/mac80211.h", "net/mac80211/tx.c"], "versions": [{"version": "06be6b149f7e406bcf16098567f5a6c9f042bced", "lessThan": "905ef207d5ed99ca64adfe39fba9ac46e434327a", "status": "affected", "versionType": "git"}, {"version": "06be6b149f7e406bcf16098567f5a6c9f042bced", "lessThan": "5ef8ca1c164786da24169af155c1ca1ff1353cf8", "status": "affected", "versionType": "git"}, {"version": "06be6b149f7e406bcf16098567f5a6c9f042bced", "lessThan": "9a779d1f480e83720b5384adf165604e7ee226bd", "status": "affected", "versionType": "git"}, {"version": "06be6b149f7e406bcf16098567f5a6c9f042bced", "lessThan": "f77b51bcee7be2bb686b5f7a2d4a1921e4bdb9f4", "status": "affected", "versionType": "git"}, {"version": "06be6b149f7e406bcf16098567f5a6c9f042bced", "lessThan": "3b4d27acafaeab478fd24f79ad6e593a892828b9", "status": "affected", "versionType": "git"}, {"version": "06be6b149f7e406bcf16098567f5a6c9f042bced", "lessThan": "06e769dddcbeb3baf2ce346273b53dd61fdbecf4", "status": "affected", "versionType": "git"}, {"version": "06be6b149f7e406bcf16098567f5a6c9f042bced", "lessThan": "50f1b690b4868923fbd242298def2fb88662f108", "status": "affected", "versionType": "git"}, {"version": "06be6b149f7e406bcf16098567f5a6c9f042bced", "lessThan": "d5ad6ab61cbd89afdb60881f6274f74328af3ee9", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/wireless/ath/ath9k/channel.c", "drivers/net/wireless/mediatek/mt76/scan.c", "drivers/net/wireless/virtual/mac80211_hwsim.c", "include/net/mac80211.h", "net/mac80211/tx.c"], "versions": [{"version": "3.13", "status": "affected"}, {"version": "0", "lessThan": "3.13", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.258", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.209", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.136", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.84", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.20", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.10", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "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": "3.13", "versionEndExcluding": "5.10.258"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "5.15.209"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "6.1.175"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "6.6.136"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "6.12.84"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "6.18.20"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "6.19.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.13", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/905ef207d5ed99ca64adfe39fba9ac46e434327a"}, {"url": "https://git.kernel.org/stable/c/5ef8ca1c164786da24169af155c1ca1ff1353cf8"}, {"url": "https://git.kernel.org/stable/c/9a779d1f480e83720b5384adf165604e7ee226bd"}, {"url": "https://git.kernel.org/stable/c/f77b51bcee7be2bb686b5f7a2d4a1921e4bdb9f4"}, {"url": "https://git.kernel.org/stable/c/3b4d27acafaeab478fd24f79ad6e593a892828b9"}, {"url": "https://git.kernel.org/stable/c/06e769dddcbeb3baf2ce346273b53dd61fdbecf4"}, {"url": "https://git.kernel.org/stable/c/50f1b690b4868923fbd242298def2fb88662f108"}, {"url": "https://git.kernel.org/stable/c/d5ad6ab61cbd89afdb60881f6274f74328af3ee9"}], "title": "wifi: mac80211: always free skb on ieee80211_tx_prepare_skb() failure", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"x_adpType": "supplier", "providerMetadata": {"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-10-15T01:15:05.658Z"}, "affected": [{"vendor": "Siemens", "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem", "versions": [{"status": "affected", "version": "0", "lessThan": "*", "versionType": "custom"}], "defaultStatus": "unknown"}], "references": [{"url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}]}, {"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-23444", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T15:08:09.371784Z"}}}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-401", "description": "CWE-401 Missing Release of Memory after Effective Lifetime"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T15:08:10.178Z"}, "title": "CISA ADP Vulnrichment"}]}}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/net/wireless/ath/ath9k/channel.c", "drivers/net/wireless/mediatek/mt76/scan.c", "drivers/net/wireless/virtual/mac80211_hwsim.c", "include/net/mac80211.h", "net/mac80211/tx.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "905ef207d5ed99ca64adfe39fba9ac46e434327a", "status": "affected", "version": "06be6b149f7e406bcf16098567f5a6c9f042bced", "versionType": "git"}, {"lessThan": "5ef8ca1c164786da24169af155c1ca1ff1353cf8", "status": "affected", "version": "06be6b149f7e406bcf16098567f5a6c9f042bced", "versionType": "git"}, {"lessThan": "9a779d1f480e83720b5384adf165604e7ee226bd", "status": "affected", "version": "06be6b149f7e406bcf16098567f5a6c9f042bced", "versionType": "git"}, {"lessThan": "f77b51bcee7be2bb686b5f7a2d4a1921e4bdb9f4", "status": "affected", "version": "06be6b149f7e406bcf16098567f5a6c9f042bced", "versionType": "git"}, {"lessThan": "3b4d27acafaeab478fd24f79ad6e593a892828b9", "status": "affected", "version": "06be6b149f7e406bcf16098567f5a6c9f042bced", "versionType": "git"}, {"lessThan": "06e769dddcbeb3baf2ce346273b53dd61fdbecf4", "status": "affected", "version": "06be6b149f7e406bcf16098567f5a6c9f042bced", "versionType": "git"}, {"lessThan": "50f1b690b4868923fbd242298def2fb88662f108", "status": "affected", "version": "06be6b149f7e406bcf16098567f5a6c9f042bced", "versionType": "git"}, {"lessThan": "d5ad6ab61cbd89afdb60881f6274f74328af3ee9", "status": "affected", "version": "06be6b149f7e406bcf16098567f5a6c9f042bced", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/net/wireless/ath/ath9k/channel.c", "drivers/net/wireless/mediatek/mt76/scan.c", "drivers/net/wireless/virtual/mac80211_hwsim.c", "include/net/mac80211.h", "net/mac80211/tx.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "3.13"}, {"lessThan": "3.13", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.258", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.209", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.175", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.136", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.84", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.20", "versionType": "semver"}, {"lessThanOrEqual": "6.19.*", "status": "unaffected", "version": "6.19.10", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.0", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"affectedData": [{"defaultStatus": "unknown", "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem", "vendor": "Siemens", "versions": [{"lessThan": "*", "status": "affected", "version": "0", "versionType": "custom"}]}], "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}], "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."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nwifi: mac80211: liberar siempre skb en caso de fallo de ieee80211_tx_prepare_skb()\n\nieee80211_tx_prepare_skb() tiene tres rutas de error, pero solo dos de ellas liberan el skb. La primera ruta de error (ieee80211_tx_prepare() devolviendo TX_DROP) no lo libera, mientras que el fallo de invoke_tx_handlers() y la comprobaci\u00f3n de fragmentaci\u00f3n s\u00ed lo hacen.\n\nA\u00f1adir kfree_skb() a la primera ruta de error para que las tres sean consistentes, y eliminar las liberaciones ahora redundantes en las funciones que llaman (ath9k, mt76, mac80211_hwsim) para evitar la doble liberaci\u00f3n.\n\nDocumentar la garant\u00eda de propiedad del skb en el kdoc de la funci\u00f3n."}], "id": "CVE-2026-23444", "lastModified": "2026-10-19T19:17:48.407", "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"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-23444", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:08:09.371784Z", "version": "2.0.3"}}]}, "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", "url": "https://git.kernel.org/stable/c/5ef8ca1c164786da24169af155c1ca1ff1353cf8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/905ef207d5ed99ca64adfe39fba9ac46e434327a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9a779d1f480e83720b5384adf165604e7ee226bd"}, {"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"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-784472.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-401"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-401"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"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"]}