CVE-2026-23444
Full vulnerability record from the local CVENow database.
Description
In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: always free skb on ieee80211_tx_prepare_skb() failure ieee80211_tx_prepare_skb() has three error paths, but only two of them free the skb. The first error path (ieee80211_tx_prepare() returning TX_DROP) does not free it, while invoke_tx_handlers() failure and the fragmentation check both do. Add kfree_skb() to the first error path so all three are consistent, and remove the now-redundant frees in callers (ath9k, mt76, mac80211_hwsim) to avoid double-free. Document the skb ownership guarantee in the function's kdoc.
Severity
MEDIUM
CVSS score
5.5
(v3.1)
Vulnerability status
Modified
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-04-03 16:16:28.810000
Last modified
2026-10-19 19:17:48.407000
View original CVE JSON
{
"id": "CVE-2026-23444",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"published": "2026-04-03T16:16:28.810",
"lastModified": "2026-10-19T19:17:48.407",
"vulnStatus": "Modified",
"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 comprobación de fragmentación sí lo hacen.\n\nAñadir 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 liberación.\n\nDocumentar la garantía de propiedad del skb en el kdoc de la función."
}
],
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"drivers/net/wireless/mediatek/mt76/scan.c",
"drivers/net/wireless/virtual/mac80211_hwsim.c",
"include/net/mac80211.h",
"net/mac80211/tx.c"
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"drivers/net/wireless/mediatek/mt76/scan.c",
"drivers/net/wireless/virtual/mac80211_hwsim.c",
"include/net/mac80211.h",
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"affectedData": [
{
"vendor": "Siemens",
"product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem",
"defaultStatus": "unknown",
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"lessThan": "*",
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"metrics": {
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{
"source": "[email protected]",
"type": "Primary",
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"ssvcData": {
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"id": "CVE-2026-23444",
"options": [
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"weaknesses": [
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"source": "[email protected]",
"type": "Primary",
"description": [
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"value": "CWE-401"
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{
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"configurations": [
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