CVE-2026-23444 (GCVE-0-2026-23444)
Vulnerability from cvelistv5 – Published: 2026-04-03 15:15 – Updated: 2026-04-27 14:02
VLAI?
Title
wifi: mac80211: always free skb on ieee80211_tx_prepare_skb() failure
Summary
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 ?
7.8 (High)
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Affected:
06be6b149f7e406bcf16098567f5a6c9f042bced , < f77b51bcee7be2bb686b5f7a2d4a1921e4bdb9f4
(git)
Affected: 06be6b149f7e406bcf16098567f5a6c9f042bced , < 3b4d27acafaeab478fd24f79ad6e593a892828b9 (git) Affected: 06be6b149f7e406bcf16098567f5a6c9f042bced , < 06e769dddcbeb3baf2ce346273b53dd61fdbecf4 (git) Affected: 06be6b149f7e406bcf16098567f5a6c9f042bced , < 50f1b690b4868923fbd242298def2fb88662f108 (git) Affected: 06be6b149f7e406bcf16098567f5a6c9f042bced , < d5ad6ab61cbd89afdb60881f6274f74328af3ee9 (git) |
||
{
"containers": {
"cna": {
"affected": [
{
"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"
],
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"vendor": "Linux",
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{
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"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"
],
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"version": "0",
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},
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"status": "unaffected",
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},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.84",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.20",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.19.10",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix"
}
]
}
],
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"descriptions": [
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"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\u0027s kdoc."
}
],
"metrics": [
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-04-27T14:02:26.358Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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},
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},
{
"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": {
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}
}
},
"cveMetadata": {
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"assignerShortName": "Linux",
"cveId": "CVE-2026-23444",
"datePublished": "2026-04-03T15:15:28.464Z",
"dateReserved": "2026-01-13T15:37:46.019Z",
"dateUpdated": "2026-04-27T14:02:26.358Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-23444",
"date": "2026-05-06",
"epss": "0.00015",
"percentile": "0.03376"
},
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}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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