CVE-2026-43216
Vulnérabilité non évaluée dans Linux (Linux)
Description
In the Linux kernel, the following vulnerability has been resolved: net: Drop the lock in skb_may_tx_timestamp() skb_may_tx_timestamp() may acquire sock::sk_callback_lock. The lock must not be taken in IRQ context, only softirq is okay. A few drivers receive the timestamp via a dedicated interrupt and complete the TX timestamp from that handler. This will lead to a deadlock if the lock is already write-locked on the same CPU. Taking the lock can be avoided. The socket (pointed by the skb) will remain valid until the skb is released. The ->sk_socket and ->file member will be set to NULL once the user closes the socket which may happen before the timestamp arrives. If we happen to observe the pointer while the socket is closing but before the pointer is set to NULL then we may use it because both pointer (and the file's cred member) are RCU freed. Drop the lock. Use READ_ONCE() to obtain the individual pointer. Add a matching WRITE_ONCE() where the pointer are cleared.
Gravité et risque d'exploitation
CVE-2026-43216 obtient un score CVSS de 0.0/10, soit une gravité non évaluée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.14 %, ce qui la place devant 2.8 % des CVE référencées.
Que faire ?
- Vérifiez si Linux (versions <=6.1.*, <=6.12.*, <f3e4cceafad27c9363c33622732f86722846ec6f, 0, <4839cbda8f13e99ce2bb3b593f5cc3288415684b, 7.0, <4.0, 6.1.178, <=5.10.*, <=6.6.*, 6.12.95, 4.0, <=6.19.*, <e4c6efb3b70ff87f1df99efce2f8893717695718, <c770217044d9cbe16a1f7c385cf080ed06a2fc04, <=6.18.*, 5.15.212, 6.6.145, b245be1f4db1a0394e4b6eb66059814b46670ac3, 5.10.261, 6.19.6, <983512f3a87fd8dc4c94dfa6b596b6e57df5aad7, <3709d73ace37e9aaebb688f5a5cf706d74350b64, 6.18.16, <=*, <=5.15.*, <cd2463ec60f0d6e460078037c86f9d0947ee1ff6, <cf7599116c4c0082fd25cb1bf0254631da0ed06e) est présent sur votre parc.
- Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
- À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
- Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.
Références
- https://git.kernel.org/stable/c/4839cbda8f13e99ce2bb3b593f5cc3288415684b
- https://git.kernel.org/stable/c/3709d73ace37e9aaebb688f5a5cf706d74350b64
- https://git.kernel.org/stable/c/cf7599116c4c0082fd25cb1bf0254631da0ed06e
- https://git.kernel.org/stable/c/cd2463ec60f0d6e460078037c86f9d0947ee1ff6
- https://git.kernel.org/stable/c/c770217044d9cbe16a1f7c385cf080ed06a2fc04
- https://git.kernel.org/stable/c/f3e4cceafad27c9363c33622732f86722846ec6f
- https://git.kernel.org/stable/c/e4c6efb3b70ff87f1df99efce2f8893717695718
- https://git.kernel.org/stable/c/983512f3a87fd8dc4c94dfa6b596b6e57df5aad7