# CVE-2026-93254: linux: In the Linux kernel, the following vulnerability has been resolved:  arm64: entry: Avoid unnecessary local_irq_disabl...

CVE-2026-93254 is fixed in linux on 1 platform by DEBIAN-CVE-2026-93254 (version 7.2.6-1), released September 24, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-93254
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 24, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:  arm64: entry: Avoid unnecessary local_irq_disable() on kernel exit  Currently, when exiting to kernel mode, we attempt involuntary preemption. The preemption logic expects IRQs to be disabled, which is why we call local_irq_disable() before attempting preemption.  However, depending on the context, local_irq_disable() may be unnecessary:  - __el1_irq(), the non-NMI EL1 IRQ path, already has IRQs disabled, so   local_irq_disable() is redundant.  - irqentry_exit_to_kernel_mode_preempt() immediately returns when   exiting from an NMI-like context, so calling local_irq_disable()   beforehand is unnecessary work.  Furthermore, it confuses the pNMI state tracking when we are in a context with interrupts disabled and the GIC_PRIO_PSR_I_SET bit is set in the PMR, leading to a warning when CONFIG_ARM64_DEBUG_PRIORITY_MASKING=y:       WARNING: ./arch/arm64/include/asm/irqflags.h:63 at arm64_exit_to_kernel_mode+0xb8/0xc0, CPU#40: retsnoop/31805      CPU: 40 UID: 0 PID: 31805 Comm: retsnoop Not tainted 7.2.0-rc6-next-20260805 #7 PREEMPTLAZY      pstate: 234013c9 (nzCv DAIF +PAN -UAO +TCO +DIT +SSBS BTYPE=--)      pc : arm64_exit_to_kernel_mode (arch/arm64/kernel/entry-common.c:63)      lr : el1_abort (arch/arm64/kernel/entry-common.c:323)      pmr: 000000f0      Call trace:       arm64_exit_to_kernel_mode (arch/arm64/kernel/entry-common.c:63) (P)       el1_abort (arch/arm64/kernel/entry-common.c:323)       el1h_64_sync_handler (arch/arm64/kernel/entry-common.c:449)       el1h_64_sync (arch/arm64/kernel/entry.S:589)       [...]  Split arm64_exit_to_kernel_mode() into preempt, non-preempt, and dispatch parts so that we can avoid this extra work where it is not needed and avoid breaking the pNMI tracking logic.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 7.2.6-1 | [DEBIAN-CVE-2026-93254](https://patchblox.com/security/data/fix/linux/debian-cve-2026-93254.md) | Sep 24, 2026 |

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Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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