{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/powerpc/include/asm/entry-common.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "95cd316a896f1c1aa4ee4a817ba3d4691103c81b",
              "status": "affected",
              "version": "334f3f6d7a1660fd65597bad9960bfa33a716d35",
              "versionType": "git"
            },
            {
              "lessThan": "63a7531ca31f9f097d9cc1cc3fe86ae683cdabdd",
              "status": "affected",
              "version": "334f3f6d7a1660fd65597bad9960bfa33a716d35",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/powerpc/include/asm/entry-common.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.2"
            },
            {
              "lessThan": "7.2",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.7",
                  "versionStartIncluding": "7.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "7.2",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/entry: Fix irq_soft_mask corruption on replayed interrupt exit\n\nWhen __replay_soft_interrupts() replays a pending interrupt (e.g.\nPACA_IRQ_DEC -\u003e timer_interrupt), it calls the handler directly with a\nsynthetic pt_regs. The DEFINE_INTERRUPT_HANDLER_ASYNC wrapper around\neach handler calls arch_interrupt_async_exit_prepare() on the way out,\nwhich calls arch_interrupt_exit_prepare() -\u003e local_irq_disable() -\u003e\narch_local_irq_disable(), which does:\n\n    irq_soft_mask_set(IRQS_DISABLED)   /* 0x1 */\n\nThis unconditionally overwrites irq_soft_mask with IRQS_DISABLED (0x1),\nstripping the IRQS_PMI_DISABLED (0x2) bit. The result is that\nirq_soft_mask is 0x1 instead of IRQS_ALL_DISABLED (0x3) when the\nhandler returns to __replay_soft_interrupts().\n\nFor a normally-taken interrupt this is harmless: the next interrupt\nalways enters through arch_interrupt_enter_prepare() which\nunconditionally sets irq_soft_mask to IRQS_ALL_DISABLED. But during\nreplay, next_interrupt() is called directly between replayed handlers\nwithout going back through arch_interrupt_enter_prepare(), so the\nstripped bit is never restored. next_interrupt() then fires a WARNING:\n\n    WARNING: arch/powerpc/kernel/irq_64.c:75\n    WARN_ON(irq_soft_mask_return() != IRQS_ALL_DISABLED)\n\nThe warning was observed early in boot on a POWER10 pseries guest\nduring kmem_cache_init_late(), where a spinlock release triggers\ninterrupt replay that processes a pending timer interrupt.\n\nDebugger state confirming the bug:\n  Before timer_interrupt(\u0026regs):\n    irq_soft_mask = 0x3 (IRQS_ALL_DISABLED)   correct\n    irq_happened  = 0x41 (HARD_DIS|REPLAYING)  correct\n  After timer_interrupt(\u0026regs) returns:\n    irq_soft_mask = 0x1 (IRQS_DISABLED)        WRONG - PMI bit stripped\n    irq_happened  = 0x41                        unchanged\n\nThe fix is to replace local_irq_disable() with hard_irq_disable().\n\nhard_irq_disable() is the right primitive here for two reasons:\n\n1. On PPC64 (hw_irq.h:301) it calls irq_soft_mask_set_return(IRQS_ALL_DISABLED),\n   setting the soft mask to 0x3 (both IRQS_DISABLED and IRQS_PMI_DISABLED),\n   which preserves the PMI bit and fixes the WARNING. The additional\n   work it does (__hard_irq_disable(), PACA_IRQ_HARD_DIS |=) is\n   redundant but safe since both are already set at this point in the\n   exit path; the trace_hardirqs_off() inside is guarded by\n   if (!arch_irqs_disabled_flags(flags)) so it will not double-fire.\n\n2. On PPC32 (hw_irq.h:467) hard_irq_disable() maps to\n   arch_local_irq_disable() -\u003e __hard_irq_disable(), which clears\n   MSR[EE] in hardware. This is exactly correct: PPC32 has no soft-mask\n   PACA mechanism, so the hardware disable is the right way to satisfy\n   irqentry_exit()\u0027s requirement. This also fixes a build error on PPC32\n   where irq_soft_mask_set() is only defined under CONFIG_PPC64:\n\n       arch/powerpc/include/asm/entry-common.h:273: error: implicit\n       declaration of function \u0027irq_soft_mask_set\u0027\n\n   Using hard_irq_disable() requires no #ifdef and is consistent with\n   how the rest of the entry code (e.g. entry-common.h:463) handles the\n   same PPC32/PPC64 split."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:18:48.849Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/95cd316a896f1c1aa4ee4a817ba3d4691103c81b"
        },
        {
          "url": "https://git.kernel.org/stable/c/63a7531ca31f9f097d9cc1cc3fe86ae683cdabdd"
        }
      ],
      "title": "powerpc/entry: Fix irq_soft_mask corruption on replayed interrupt exit",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98395",
    "datePublished": "2026-10-14T13:25:57.887Z",
    "dateReserved": "2026-09-25T10:25:14.346Z",
    "dateUpdated": "2026-10-19T09:18:48.849Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}