CVE-2026-93259: Linux kernel · powerpc/irq: Fix missing r2 clobber in PCREL inline assembly
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in dcc442a49c0f540193910dacdca7506bcadc7ec5 : patch Linux kernel soon.
Data as of 26 Oct 2026, 14:05 UTC
Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 8% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in dcc442a49c0f540193910dacdca7506bcadc7ec5, 602ee44415f3eaa7893f7fc488c7c1d4a0bdbd7a, 90d953002cf0b233dd053a0e7cb67ab79cebd0e3 +2
Exploitation evidence
Disclosed: evidence found.
CVE published 24 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: 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 26 Oct 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– |
AI-suggested
A fix is available and has been applied in the Linux kernel. The issue is resolved by adding r2 to the clobber list in call_do_irq() and call_do_softirq() functions. Users should update to the fixed kernel versions containing the patch identified by the provided commit hashes.
Description
A vulnerability in the Linux kernel's powerpc/irq code causes a kernel crash during interrupt handling due to a missing r2 register clobber in inline assembly. This leads to register corruption and kernel failure to boot when CONFIG_PPC_KERNEL_PCREL mode is enabled. The issue arises because call_do_irq() and call_do_softirq() do not list r2 in their clobber lists, causing the compiler to incorrectly assume r2 is preserved across calls. The bug is fixed by adding r2 to the clobber list in affected functions.
References
- git.kernel.org/stable/c/dcc442a49c0f540193910dacdca7506bcadc7ec5 (opens in a new tab)
- git.kernel.org/stable/c/602ee44415f3eaa7893f7fc488c7c1d4a0bdbd7a (opens in a new tab)
- git.kernel.org/stable/c/90d953002cf0b233dd053a0e7cb67ab79cebd0e3 (opens in a new tab)
- git.kernel.org/stable/c/7b0093b638c8f2b94b0778a69fd1ccad54299b29 (opens in a new tab)
- git.kernel.org/stable/c/00be69070d91d2be978e752bb117a0a4db0e1281 (opens in a new tab)