CVE-2026-23287: Linux kernel · irqchip/sifive-plic: Fix frozen interrupt due to affinity setting
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in f611791a927141d05d7030607dea6372311c1413 : update Linux kernel when convenient.
Data as of 10 Nov 2026, 13:02 UTC
Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA
Thin evidence
One scorer or none- Patch
- Available – fixed in f611791a927141d05d7030607dea6372311c1413, 1072020685f4b81f6efad3b412cdae0bd62bb043, 1883332bf21feb8871af09daf604fc4836a76925 +3
Exploitation evidence
Disclosed: evidence found.
CVE published 25 Mar 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 10 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 commits identified by the fixedVersions hashes. Users should update to a Linux kernel version that includes these fixes to resolve the frozen interrupt issue caused by affinity setting changes.
Description
A vulnerability in the Linux kernel's irqchip/sifive-plic component caused interrupts to freeze when the interrupt affinity setting was changed during handling. The issue arose because the PLIC hardware ignored completion messages for disabled interrupts, leading to a frozen UART port under certain conditions. The problem was fixed by changing the check to verify the PLIC's enable bit before sending the completion message.
References
- git.kernel.org/stable/c/8942fb1a5bc2dcbd88f7e656d109d42f778f298f (opens in a new tab)
- git.kernel.org/stable/c/2edbd173309165d103be6c73bd83e459dc45ae7b (opens in a new tab)
- git.kernel.org/stable/c/686eb378a4a51aa967e08337dd59daade16aec0f (opens in a new tab)
- git.kernel.org/stable/c/1883332bf21feb8871af09daf604fc4836a76925 (opens in a new tab)
- git.kernel.org/stable/c/f611791a927141d05d7030607dea6372311c1413 (opens in a new tab)
- git.kernel.org/stable/c/1072020685f4b81f6efad3b412cdae0bd62bb043 (opens in a new tab)
- cert-portal.siemens.com/productcert/html/ssa-082556.html (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)