Answer in brief
CVE-2026-23444 records a High severity (CVSS 7.8) vulnerability in wifi: mac80211: always free skb on ieee80211_tx_prepare_skb() failure. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=06be6b149f7e406bcf16098567f5a6c9f042bced <905ef207d5ed99ca64adfe39fba9ac46e434327a || >=06be6b149f7e406bcf16098567f5a6c9f042bced <5ef8ca1c164786da24169af155c1ca1ff1353cf8 || >=06be6b149f7e406bcf16098567f5a6c9f042bced <9a779d1f480e83720b5384adf165604e7ee226bd || >=06be6b149f7e406bcf16098567f5a6c9f042bced <f77b51bcee7be2bb686b5f7a2d4a1921e4bdb9f4 || >=06be6b149f7e406bcf16098567f5a6c9f042bced <3b4d27acafaeab478fd24f79ad6e593a892828b9 || >=06be6b149f7e406bcf16098567f5a6c9f042bced <06e769dddcbeb3baf2ce346273b53dd61fdbecf4 || >=06be6b149f7e406bcf16098567f5a6c9f042bced <50f1b690b4868923fbd242298def2fb88662f108 || >=06be6b149f7e406bcf16098567f5a6c9f042bced <d5ad6ab61cbd89afdb60881f6274f74328af3ee9 | 905ef207d5ed99ca64adfe39fba9ac46e434327a, 5ef8ca1c164786da24169af155c1ca1ff1353cf8, 9a779d1f480e83720b5384adf165604e7ee226bd, f77b51bcee7be2bb686b5f7a2d4a1921e4bdb9f4, 3b4d27acafaeab478fd24f79ad6e593a892828b9, 06e769dddcbeb3baf2ce346273b53dd61fdbecf4, 50f1b690b4868923fbd242298def2fb88662f108, d5ad6ab61cbd89afdb60881f6274f74328af3ee9 |
| Linux/Linuxgeneric | 3.13 | Not reported |
| Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystemgeneric | >=0 <* | * |
Published upstream
Apr 3, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 15, 2026
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.
Quoted source text, attributed separately from HOL analysis.