CVE-2026-43363 (GCVE-0-2026-43363)
Vulnerability from cvelistv5 – Published: 2026-05-08 14:21 – Updated: 2026-05-08 14:21
VLAI?
Title
x86/apic: Disable x2apic on resume if the kernel expects so
Summary
In the Linux kernel, the following vulnerability has been resolved:
x86/apic: Disable x2apic on resume if the kernel expects so
When resuming from s2ram, firmware may re-enable x2apic mode, which may have
been disabled by the kernel during boot either because it doesn't support IRQ
remapping or for other reasons. This causes the kernel to continue using the
xapic interface, while the hardware is in x2apic mode, which causes hangs.
This happens on defconfig + bare metal + s2ram.
Fix this in lapic_resume() by disabling x2apic if the kernel expects it to be
disabled, i.e. when x2apic_mode = 0.
The ACPI v6.6 spec, Section 16.3 [1] says firmware restores either the
pre-sleep configuration or initial boot configuration for each CPU, including
MSR state:
When executing from the power-on reset vector as a result of waking from an
S2 or S3 sleep state, the platform firmware performs only the hardware
initialization required to restore the system to either the state the
platform was in prior to the initial operating system boot, or to the
pre-sleep configuration state. In multiprocessor systems, non-boot
processors should be placed in the same state as prior to the initial
operating system boot.
(further ahead)
If this is an S2 or S3 wake, then the platform runtime firmware restores
minimum context of the system before jumping to the waking vector. This
includes:
CPU configuration. Platform runtime firmware restores the pre-sleep
configuration or initial boot configuration of each CPU (MSR, MTRR,
firmware update, SMBase, and so on). Interrupts must be disabled (for
IA-32 processors, disabled by CLI instruction).
(and other things)
So at least as per the spec, re-enablement of x2apic by the firmware is
allowed if "x2apic on" is a part of the initial boot configuration.
[1] https://uefi.org/specs/ACPI/6.6/16_Waking_and_Sleeping.html#initialization
[ bp: Massage. ]
Severity ?
No CVSS data available.
Assigner
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Linux | Linux |
Affected:
6e1cb38a2aef7680975e71f23de187859ee8b158 , < a6ad6f2e31b524cbb66b2f370bad0cf17d327e6c
(git)
Affected: 6e1cb38a2aef7680975e71f23de187859ee8b158 , < 3dd0812a7c764cd8f3b0182441ac22da0a7f3b09 (git) Affected: 6e1cb38a2aef7680975e71f23de187859ee8b158 , < 965289b120cc68cca886c75219c68b8c15751d73 (git) Affected: 6e1cb38a2aef7680975e71f23de187859ee8b158 , < f591938072115bf08730b8530c67fab189cc6308 (git) Affected: 6e1cb38a2aef7680975e71f23de187859ee8b158 , < 1a85f84214f9d790216547ac6086bf8033cd9e5a (git) Affected: 6e1cb38a2aef7680975e71f23de187859ee8b158 , < 11712c4eb384098db4cb08792e223c818b908c1a (git) Affected: 6e1cb38a2aef7680975e71f23de187859ee8b158 , < 1d8440c1e7c49715f937416ac90cf260f1f1712c (git) Affected: 6e1cb38a2aef7680975e71f23de187859ee8b158 , < 8cc7dd77a1466f0ec58c03478b2e735a5b289b96 (git) |
|||||||
|
|||||||||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"arch/x86/kernel/apic/apic.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "a6ad6f2e31b524cbb66b2f370bad0cf17d327e6c",
"status": "affected",
"version": "6e1cb38a2aef7680975e71f23de187859ee8b158",
"versionType": "git"
},
{
"lessThan": "3dd0812a7c764cd8f3b0182441ac22da0a7f3b09",
"status": "affected",
"version": "6e1cb38a2aef7680975e71f23de187859ee8b158",
"versionType": "git"
},
{
"lessThan": "965289b120cc68cca886c75219c68b8c15751d73",
"status": "affected",
"version": "6e1cb38a2aef7680975e71f23de187859ee8b158",
"versionType": "git"
},
{
"lessThan": "f591938072115bf08730b8530c67fab189cc6308",
"status": "affected",
"version": "6e1cb38a2aef7680975e71f23de187859ee8b158",
"versionType": "git"
},
{
"lessThan": "1a85f84214f9d790216547ac6086bf8033cd9e5a",
"status": "affected",
"version": "6e1cb38a2aef7680975e71f23de187859ee8b158",
"versionType": "git"
},
{
"lessThan": "11712c4eb384098db4cb08792e223c818b908c1a",
"status": "affected",
"version": "6e1cb38a2aef7680975e71f23de187859ee8b158",
"versionType": "git"
},
{
"lessThan": "1d8440c1e7c49715f937416ac90cf260f1f1712c",
"status": "affected",
"version": "6e1cb38a2aef7680975e71f23de187859ee8b158",
"versionType": "git"
},
{
"lessThan": "8cc7dd77a1466f0ec58c03478b2e735a5b289b96",
"status": "affected",
"version": "6e1cb38a2aef7680975e71f23de187859ee8b158",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"arch/x86/kernel/apic/apic.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.28"
},
{
"lessThan": "2.6.28",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.253",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.203",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.167",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.130",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.78",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.19",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"version": "6.19.9",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.253",
"versionStartIncluding": "2.6.28",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.203",
"versionStartIncluding": "2.6.28",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.167",
"versionStartIncluding": "2.6.28",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.130",
"versionStartIncluding": "2.6.28",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.78",
"versionStartIncluding": "2.6.28",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.19",
"versionStartIncluding": "2.6.28",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.19.9",
"versionStartIncluding": "2.6.28",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.0",
"versionStartIncluding": "2.6.28",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/apic: Disable x2apic on resume if the kernel expects so\n\nWhen resuming from s2ram, firmware may re-enable x2apic mode, which may have\nbeen disabled by the kernel during boot either because it doesn\u0027t support IRQ\nremapping or for other reasons. This causes the kernel to continue using the\nxapic interface, while the hardware is in x2apic mode, which causes hangs.\nThis happens on defconfig + bare metal + s2ram.\n\nFix this in lapic_resume() by disabling x2apic if the kernel expects it to be\ndisabled, i.e. when x2apic_mode = 0.\n\nThe ACPI v6.6 spec, Section 16.3 [1] says firmware restores either the\npre-sleep configuration or initial boot configuration for each CPU, including\nMSR state:\n\n When executing from the power-on reset vector as a result of waking from an\n S2 or S3 sleep state, the platform firmware performs only the hardware\n initialization required to restore the system to either the state the\n platform was in prior to the initial operating system boot, or to the\n pre-sleep configuration state. In multiprocessor systems, non-boot\n processors should be placed in the same state as prior to the initial\n operating system boot.\n\n (further ahead)\n\n If this is an S2 or S3 wake, then the platform runtime firmware restores\n minimum context of the system before jumping to the waking vector. This\n includes:\n\n\tCPU configuration. Platform runtime firmware restores the pre-sleep\n\tconfiguration or initial boot configuration of each CPU (MSR, MTRR,\n\tfirmware update, SMBase, and so on). Interrupts must be disabled (for\n\tIA-32 processors, disabled by CLI instruction).\n\n\t(and other things)\n\nSo at least as per the spec, re-enablement of x2apic by the firmware is\nallowed if \"x2apic on\" is a part of the initial boot configuration.\n\n [1] https://uefi.org/specs/ACPI/6.6/16_Waking_and_Sleeping.html#initialization\n\n [ bp: Massage. ]"
}
],
"providerMetadata": {
"dateUpdated": "2026-05-08T14:21:16.986Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/a6ad6f2e31b524cbb66b2f370bad0cf17d327e6c"
},
{
"url": "https://git.kernel.org/stable/c/3dd0812a7c764cd8f3b0182441ac22da0a7f3b09"
},
{
"url": "https://git.kernel.org/stable/c/965289b120cc68cca886c75219c68b8c15751d73"
},
{
"url": "https://git.kernel.org/stable/c/f591938072115bf08730b8530c67fab189cc6308"
},
{
"url": "https://git.kernel.org/stable/c/1a85f84214f9d790216547ac6086bf8033cd9e5a"
},
{
"url": "https://git.kernel.org/stable/c/11712c4eb384098db4cb08792e223c818b908c1a"
},
{
"url": "https://git.kernel.org/stable/c/1d8440c1e7c49715f937416ac90cf260f1f1712c"
},
{
"url": "https://git.kernel.org/stable/c/8cc7dd77a1466f0ec58c03478b2e735a5b289b96"
}
],
"title": "x86/apic: Disable x2apic on resume if the kernel expects so",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-43363",
"datePublished": "2026-05-08T14:21:16.986Z",
"dateReserved": "2026-05-01T14:12:56.005Z",
"dateUpdated": "2026-05-08T14:21:16.986Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-43363",
"date": "2026-05-09",
"epss": "0.00024",
"percentile": "0.07036"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-43363\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-08T15:16:47.247\",\"lastModified\":\"2026-05-08T15:16:47.247\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nx86/apic: Disable x2apic on resume if the kernel expects so\\n\\nWhen resuming from s2ram, firmware may re-enable x2apic mode, which may have\\nbeen disabled by the kernel during boot either because it doesn\u0027t support IRQ\\nremapping or for other reasons. This causes the kernel to continue using the\\nxapic interface, while the hardware is in x2apic mode, which causes hangs.\\nThis happens on defconfig + bare metal + s2ram.\\n\\nFix this in lapic_resume() by disabling x2apic if the kernel expects it to be\\ndisabled, i.e. when x2apic_mode = 0.\\n\\nThe ACPI v6.6 spec, Section 16.3 [1] says firmware restores either the\\npre-sleep configuration or initial boot configuration for each CPU, including\\nMSR state:\\n\\n When executing from the power-on reset vector as a result of waking from an\\n S2 or S3 sleep state, the platform firmware performs only the hardware\\n initialization required to restore the system to either the state the\\n platform was in prior to the initial operating system boot, or to the\\n pre-sleep configuration state. In multiprocessor systems, non-boot\\n processors should be placed in the same state as prior to the initial\\n operating system boot.\\n\\n (further ahead)\\n\\n If this is an S2 or S3 wake, then the platform runtime firmware restores\\n minimum context of the system before jumping to the waking vector. This\\n includes:\\n\\n\\tCPU configuration. Platform runtime firmware restores the pre-sleep\\n\\tconfiguration or initial boot configuration of each CPU (MSR, MTRR,\\n\\tfirmware update, SMBase, and so on). Interrupts must be disabled (for\\n\\tIA-32 processors, disabled by CLI instruction).\\n\\n\\t(and other things)\\n\\nSo at least as per the spec, re-enablement of x2apic by the firmware is\\nallowed if \\\"x2apic on\\\" is a part of the initial boot configuration.\\n\\n [1] https://uefi.org/specs/ACPI/6.6/16_Waking_and_Sleeping.html#initialization\\n\\n [ bp: Massage. ]\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/11712c4eb384098db4cb08792e223c818b908c1a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1a85f84214f9d790216547ac6086bf8033cd9e5a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1d8440c1e7c49715f937416ac90cf260f1f1712c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3dd0812a7c764cd8f3b0182441ac22da0a7f3b09\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8cc7dd77a1466f0ec58c03478b2e735a5b289b96\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/965289b120cc68cca886c75219c68b8c15751d73\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a6ad6f2e31b524cbb66b2f370bad0cf17d327e6c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f591938072115bf08730b8530c67fab189cc6308\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Loading…
Loading…