122 lines
7.9 KiB
JSON
122 lines
7.9 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-98395",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-09-25T10:25:14.346Z",
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"datePublished": "2026-10-14T13:25:57.887Z",
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"dateUpdated": "2026-10-19T09:18:48.849Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-19T09:18:48.849Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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 -> 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() -> local_irq_disable() ->\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(®s):\n irq_soft_mask = 0x3 (IRQS_ALL_DISABLED) correct\n irq_happened = 0x41 (HARD_DIS|REPLAYING) correct\n After timer_interrupt(®s) 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() -> __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()'s 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 'irq_soft_mask_set'\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."
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"arch/powerpc/include/asm/entry-common.h"
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],
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"versions": [
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{
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"version": "334f3f6d7a1660fd65597bad9960bfa33a716d35",
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"lessThan": "95cd316a896f1c1aa4ee4a817ba3d4691103c81b",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "334f3f6d7a1660fd65597bad9960bfa33a716d35",
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"lessThan": "63a7531ca31f9f097d9cc1cc3fe86ae683cdabdd",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"arch/powerpc/include/asm/entry-common.h"
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],
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"versions": [
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{
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"version": "7.2",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "7.2",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2.7",
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"lessThanOrEqual": "7.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.3",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "7.2",
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"versionEndExcluding": "7.2.7"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "7.2",
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"versionEndExcluding": "7.3"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/95cd316a896f1c1aa4ee4a817ba3d4691103c81b"
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},
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{
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"url": "https://git.kernel.org/stable/c/63a7531ca31f9f097d9cc1cc3fe86ae683cdabdd"
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}
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],
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"title": "powerpc/entry: Fix irq_soft_mask corruption on replayed interrupt exit",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |