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… (CVE-2026-43216)
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.
AI Analysis
Technical Summary
This vulnerability, tracked as CVE-2026-43216, involves the dropping of a lock in the skb_may_tx_timestamp() function within Microsoft product version 3.0. The exact technical implications or exploitation methods are not detailed in the provided information. No known exploits are reported in the wild, and no patch or remediation details are available from the vendor advisory or other sources.
Potential Impact
Due to the lack of detailed technical information and absence of known exploits, the impact cannot be precisely determined from the available data. The vulnerability may affect the stability or security of the affected Microsoft product version 3.0, but specific consequences are not described.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or mitigation steps are provided in the available information.
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… (CVE-2026-43216)
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.
CVSS v3.1
Score 5.5medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability, tracked as CVE-2026-43216, involves the dropping of a lock in the skb_may_tx_timestamp() function within Microsoft product version 3.0. The exact technical implications or exploitation methods are not detailed in the provided information. No known exploits are reported in the wild, and no patch or remediation details are available from the vendor advisory or other sources.
Potential Impact
Due to the lack of detailed technical information and absence of known exploits, the impact cannot be precisely determined from the available data. The vulnerability may affect the stability or security of the affected Microsoft product version 3.0, but specific consequences are not described.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or mitigation steps are provided in the available information.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_vex
- Csaf Version
- 2.0
- Publisher
- Microsoft Security Response Center
- Advisory Id
- msrc_CVE-2026-43216
- Cve Count
- 1
- Additional Cves
- []
- Cvss Version
- 3.1
Threat ID: 6a42ed8c27e9c79719960b9e
Added to database: 06/29/2026, 22:11:24 UTC
Last enriched: 06/29/2026, 22:52:53 UTC
Last updated: 07/31/2026, 19:24:47 UTC
Views: 8
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