CVE-2026-43216: Linux kernel · net: Drop the lock in skb_may_tx_timestamp()
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in f3e4cceafad27c9363c33622732f86722846ec6f : patch Linux kernel soon.
Data as of 6 Nov 2026, 15:50 UTC
Rated High by Threat Radar's AI analysis · No CVSS score from NVD or the CNA
Thin evidence
One scorer or none- CISA SSVC
- Exploitation
- No evidence of active exploitation and no public proof of concept
- Automatable
- Attackers cannot reliably automate steps 1–4 of the kill chain
- Technical impact
- Limited control over the software or limited information exposure
CISA SSVC assessment, 2026-11-06.
- Patch
- Available – fixed in f3e4cceafad27c9363c33622732f86722846ec6f, e4c6efb3b70ff87f1df99efce2f8893717695718, cf7599116c4c0082fd25cb1bf0254631da0ed06e +5
Exploitation evidence
Disclosed: evidence found.
CVE published 6 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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AI-suggested
A fix is available and has been applied in the Linux kernel source code as indicated by the listed fixed commit versions. Users and administrators should update to a kernel version that includes these fixes to prevent deadlocks caused by this issue.
Description
A deadlock vulnerability in the Linux kernel's skb_may_tx_timestamp() function was resolved by removing a lock that could be taken in an IRQ context, which is unsafe. The issue involved acquiring the sk_callback_lock in contexts where it should not be held, potentially causing deadlocks on the same CPU. The fix involves dropping the lock and using atomic pointer operations to safely access socket pointers without risking deadlocks.
References
- git.kernel.org/stable/c/4839cbda8f13e99ce2bb3b593f5cc3288415684b (opens in a new tab)
- git.kernel.org/stable/c/3709d73ace37e9aaebb688f5a5cf706d74350b64 (opens in a new tab)
- git.kernel.org/stable/c/cf7599116c4c0082fd25cb1bf0254631da0ed06e (opens in a new tab)
- git.kernel.org/stable/c/cd2463ec60f0d6e460078037c86f9d0947ee1ff6 (opens in a new tab)
- git.kernel.org/stable/c/c770217044d9cbe16a1f7c385cf080ed06a2fc04 (opens in a new tab)
- git.kernel.org/stable/c/f3e4cceafad27c9363c33622732f86722846ec6f (opens in a new tab)
- git.kernel.org/stable/c/e4c6efb3b70ff87f1df99efce2f8893717695718 (opens in a new tab)
- git.kernel.org/stable/c/983512f3a87fd8dc4c94dfa6b596b6e57df5aad7 (opens in a new tab)
- cert-portal.siemens.com/productcert/html/ssa-019113.html (opens in a new tab)
- cert-portal.siemens.com/productcert/html/ssa-457936.html (opens in a new tab)