CVE-2026-23345 (GCVE-0-2026-23345)
Vulnerability from cvelistv5 – Published: 2026-03-25 10:27 – Updated: 2026-03-25 10:27
VLAI?
Title
arm64: gcs: Do not set PTE_SHARED on GCS mappings if FEAT_LPA2 is enabled
Summary
In the Linux kernel, the following vulnerability has been resolved:
arm64: gcs: Do not set PTE_SHARED on GCS mappings if FEAT_LPA2 is enabled
When FEAT_LPA2 is enabled, bits 8-9 of the PTE replace the
shareability attribute with bits 50-51 of the output address. The
_PAGE_GCS{,_RO} definitions include the PTE_SHARED bits as 0b11 (this
matches the other _PAGE_* definitions) but using this macro directly
leads to the following panic when enabling GCS on a system/model with
LPA2:
Unable to handle kernel paging request at virtual address fffff1ffc32d8008
Mem abort info:
ESR = 0x0000000096000004
EC = 0x25: DABT (current EL), IL = 32 bits
SET = 0, FnV = 0
EA = 0, S1PTW = 0
FSC = 0x04: level 0 translation fault
Data abort info:
ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000
CM = 0, WnR = 0, TnD = 0, TagAccess = 0
GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0
swapper pgtable: 4k pages, 52-bit VAs, pgdp=0000000060f4d000
[fffff1ffc32d8008] pgd=100000006184b003, p4d=0000000000000000
Internal error: Oops: 0000000096000004 [#1] SMP
CPU: 0 UID: 0 PID: 513 Comm: gcs_write_fault Tainted: G M 7.0.0-rc1 #1 PREEMPT
Tainted: [M]=MACHINE_CHECK
Hardware name: QEMU QEMU Virtual Machine, BIOS 2025.02-8+deb13u1 11/08/2025
pstate: 03402005 (nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)
pc : zap_huge_pmd+0x168/0x468
lr : zap_huge_pmd+0x2c/0x468
sp : ffff800080beb660
x29: ffff800080beb660 x28: fff00000c2058180 x27: ffff800080beb898
x26: fff00000c2058180 x25: ffff800080beb820 x24: 00c800010b600f41
x23: ffffc1ffc30af1a8 x22: fff00000c2058180 x21: 0000ffff8dc00000
x20: fff00000c2bc6370 x19: ffff800080beb898 x18: ffff800080bebb60
x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000007
x14: 000000000000000a x13: 0000aaaacbbbffff x12: 0000000000000000
x11: 0000ffff8ddfffff x10: 00000000000001fe x9 : 0000ffff8ddfffff
x8 : 0000ffff8de00000 x7 : 0000ffff8da00000 x6 : fff00000c2bc6370
x5 : 0000ffff8da00000 x4 : 000000010b600000 x3 : ffffc1ffc0000000
x2 : fff00000c2058180 x1 : fffff1ffc32d8000 x0 : 000000c00010b600
Call trace:
zap_huge_pmd+0x168/0x468 (P)
unmap_page_range+0xd70/0x1560
unmap_single_vma+0x48/0x80
unmap_vmas+0x90/0x180
unmap_region+0x88/0xe4
vms_complete_munmap_vmas+0xf8/0x1e0
do_vmi_align_munmap+0x158/0x180
do_vmi_munmap+0xac/0x160
__vm_munmap+0xb0/0x138
vm_munmap+0x14/0x20
gcs_free+0x70/0x80
mm_release+0x1c/0xc8
exit_mm_release+0x28/0x38
do_exit+0x190/0x8ec
do_group_exit+0x34/0x90
get_signal+0x794/0x858
arch_do_signal_or_restart+0x11c/0x3e0
exit_to_user_mode_loop+0x10c/0x17c
el0_da+0x8c/0x9c
el0t_64_sync_handler+0xd0/0xf0
el0t_64_sync+0x198/0x19c
Code: aa1603e2 d34cfc00 cb813001 8b011861 (f9400420)
Similarly to how the kernel handles protection_map[], use a
gcs_page_prot variable to store the protection bits and clear PTE_SHARED
if LPA2 is enabled.
Also remove the unused PAGE_GCS{,_RO} macros.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Affected:
6497b66ba6945f142902c7e8fce86e47016ead1c , < ca1684dd297bf0725c1d487cff80e615497accf6
(git)
Affected: 6497b66ba6945f142902c7e8fce86e47016ead1c , < 1df3ef7e612d6ccbae5a48e1121553c47c2123d6 (git) Affected: 6497b66ba6945f142902c7e8fce86e47016ead1c , < 8a85b3131225a8c8143ba2ae29c0eef8c1f9117f (git) |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"arch/arm64/include/asm/pgtable-prot.h",
"arch/arm64/mm/mmap.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "ca1684dd297bf0725c1d487cff80e615497accf6",
"status": "affected",
"version": "6497b66ba6945f142902c7e8fce86e47016ead1c",
"versionType": "git"
},
{
"lessThan": "1df3ef7e612d6ccbae5a48e1121553c47c2123d6",
"status": "affected",
"version": "6497b66ba6945f142902c7e8fce86e47016ead1c",
"versionType": "git"
},
{
"lessThan": "8a85b3131225a8c8143ba2ae29c0eef8c1f9117f",
"status": "affected",
"version": "6497b66ba6945f142902c7e8fce86e47016ead1c",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"arch/arm64/include/asm/pgtable-prot.h",
"arch/arm64/mm/mmap.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.13"
},
{
"lessThan": "6.13",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.17",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"version": "6.19.7",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.0-rc2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.17",
"versionStartIncluding": "6.13",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.19.7",
"versionStartIncluding": "6.13",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.0-rc2",
"versionStartIncluding": "6.13",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64: gcs: Do not set PTE_SHARED on GCS mappings if FEAT_LPA2 is enabled\n\nWhen FEAT_LPA2 is enabled, bits 8-9 of the PTE replace the\nshareability attribute with bits 50-51 of the output address. The\n_PAGE_GCS{,_RO} definitions include the PTE_SHARED bits as 0b11 (this\nmatches the other _PAGE_* definitions) but using this macro directly\nleads to the following panic when enabling GCS on a system/model with\nLPA2:\n\n Unable to handle kernel paging request at virtual address fffff1ffc32d8008\n Mem abort info:\n ESR = 0x0000000096000004\n EC = 0x25: DABT (current EL), IL = 32 bits\n SET = 0, FnV = 0\n EA = 0, S1PTW = 0\n FSC = 0x04: level 0 translation fault\n Data abort info:\n ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000\n CM = 0, WnR = 0, TnD = 0, TagAccess = 0\n GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0\n swapper pgtable: 4k pages, 52-bit VAs, pgdp=0000000060f4d000\n [fffff1ffc32d8008] pgd=100000006184b003, p4d=0000000000000000\n Internal error: Oops: 0000000096000004 [#1] SMP\n CPU: 0 UID: 0 PID: 513 Comm: gcs_write_fault Tainted: G M 7.0.0-rc1 #1 PREEMPT\n Tainted: [M]=MACHINE_CHECK\n Hardware name: QEMU QEMU Virtual Machine, BIOS 2025.02-8+deb13u1 11/08/2025\n pstate: 03402005 (nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)\n pc : zap_huge_pmd+0x168/0x468\n lr : zap_huge_pmd+0x2c/0x468\n sp : ffff800080beb660\n x29: ffff800080beb660 x28: fff00000c2058180 x27: ffff800080beb898\n x26: fff00000c2058180 x25: ffff800080beb820 x24: 00c800010b600f41\n x23: ffffc1ffc30af1a8 x22: fff00000c2058180 x21: 0000ffff8dc00000\n x20: fff00000c2bc6370 x19: ffff800080beb898 x18: ffff800080bebb60\n x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000007\n x14: 000000000000000a x13: 0000aaaacbbbffff x12: 0000000000000000\n x11: 0000ffff8ddfffff x10: 00000000000001fe x9 : 0000ffff8ddfffff\n x8 : 0000ffff8de00000 x7 : 0000ffff8da00000 x6 : fff00000c2bc6370\n x5 : 0000ffff8da00000 x4 : 000000010b600000 x3 : ffffc1ffc0000000\n x2 : fff00000c2058180 x1 : fffff1ffc32d8000 x0 : 000000c00010b600\n Call trace:\n zap_huge_pmd+0x168/0x468 (P)\n unmap_page_range+0xd70/0x1560\n unmap_single_vma+0x48/0x80\n unmap_vmas+0x90/0x180\n unmap_region+0x88/0xe4\n vms_complete_munmap_vmas+0xf8/0x1e0\n do_vmi_align_munmap+0x158/0x180\n do_vmi_munmap+0xac/0x160\n __vm_munmap+0xb0/0x138\n vm_munmap+0x14/0x20\n gcs_free+0x70/0x80\n mm_release+0x1c/0xc8\n exit_mm_release+0x28/0x38\n do_exit+0x190/0x8ec\n do_group_exit+0x34/0x90\n get_signal+0x794/0x858\n arch_do_signal_or_restart+0x11c/0x3e0\n exit_to_user_mode_loop+0x10c/0x17c\n el0_da+0x8c/0x9c\n el0t_64_sync_handler+0xd0/0xf0\n el0t_64_sync+0x198/0x19c\n Code: aa1603e2 d34cfc00 cb813001 8b011861 (f9400420)\n\nSimilarly to how the kernel handles protection_map[], use a\ngcs_page_prot variable to store the protection bits and clear PTE_SHARED\nif LPA2 is enabled.\n\nAlso remove the unused PAGE_GCS{,_RO} macros."
}
],
"providerMetadata": {
"dateUpdated": "2026-03-25T10:27:32.432Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/ca1684dd297bf0725c1d487cff80e615497accf6"
},
{
"url": "https://git.kernel.org/stable/c/1df3ef7e612d6ccbae5a48e1121553c47c2123d6"
},
{
"url": "https://git.kernel.org/stable/c/8a85b3131225a8c8143ba2ae29c0eef8c1f9117f"
}
],
"title": "arm64: gcs: Do not set PTE_SHARED on GCS mappings if FEAT_LPA2 is enabled",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-23345",
"datePublished": "2026-03-25T10:27:32.432Z",
"dateReserved": "2026-01-13T15:37:45.999Z",
"dateUpdated": "2026-03-25T10:27:32.432Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2026-23345\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-03-25T11:16:32.610\",\"lastModified\":\"2026-03-25T15:41:33.977\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\narm64: gcs: Do not set PTE_SHARED on GCS mappings if FEAT_LPA2 is enabled\\n\\nWhen FEAT_LPA2 is enabled, bits 8-9 of the PTE replace the\\nshareability attribute with bits 50-51 of the output address. The\\n_PAGE_GCS{,_RO} definitions include the PTE_SHARED bits as 0b11 (this\\nmatches the other _PAGE_* definitions) but using this macro directly\\nleads to the following panic when enabling GCS on a system/model with\\nLPA2:\\n\\n Unable to handle kernel paging request at virtual address fffff1ffc32d8008\\n Mem abort info:\\n ESR = 0x0000000096000004\\n EC = 0x25: DABT (current EL), IL = 32 bits\\n SET = 0, FnV = 0\\n EA = 0, S1PTW = 0\\n FSC = 0x04: level 0 translation fault\\n Data abort info:\\n ISV = 0, ISS = 0x00000004, ISS2 = 0x00000000\\n CM = 0, WnR = 0, TnD = 0, TagAccess = 0\\n GCS = 0, Overlay = 0, DirtyBit = 0, Xs = 0\\n swapper pgtable: 4k pages, 52-bit VAs, pgdp=0000000060f4d000\\n [fffff1ffc32d8008] pgd=100000006184b003, p4d=0000000000000000\\n Internal error: Oops: 0000000096000004 [#1] SMP\\n CPU: 0 UID: 0 PID: 513 Comm: gcs_write_fault Tainted: G M 7.0.0-rc1 #1 PREEMPT\\n Tainted: [M]=MACHINE_CHECK\\n Hardware name: QEMU QEMU Virtual Machine, BIOS 2025.02-8+deb13u1 11/08/2025\\n pstate: 03402005 (nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--)\\n pc : zap_huge_pmd+0x168/0x468\\n lr : zap_huge_pmd+0x2c/0x468\\n sp : ffff800080beb660\\n x29: ffff800080beb660 x28: fff00000c2058180 x27: ffff800080beb898\\n x26: fff00000c2058180 x25: ffff800080beb820 x24: 00c800010b600f41\\n x23: ffffc1ffc30af1a8 x22: fff00000c2058180 x21: 0000ffff8dc00000\\n x20: fff00000c2bc6370 x19: ffff800080beb898 x18: ffff800080bebb60\\n x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000007\\n x14: 000000000000000a x13: 0000aaaacbbbffff x12: 0000000000000000\\n x11: 0000ffff8ddfffff x10: 00000000000001fe x9 : 0000ffff8ddfffff\\n x8 : 0000ffff8de00000 x7 : 0000ffff8da00000 x6 : fff00000c2bc6370\\n x5 : 0000ffff8da00000 x4 : 000000010b600000 x3 : ffffc1ffc0000000\\n x2 : fff00000c2058180 x1 : fffff1ffc32d8000 x0 : 000000c00010b600\\n Call trace:\\n zap_huge_pmd+0x168/0x468 (P)\\n unmap_page_range+0xd70/0x1560\\n unmap_single_vma+0x48/0x80\\n unmap_vmas+0x90/0x180\\n unmap_region+0x88/0xe4\\n vms_complete_munmap_vmas+0xf8/0x1e0\\n do_vmi_align_munmap+0x158/0x180\\n do_vmi_munmap+0xac/0x160\\n __vm_munmap+0xb0/0x138\\n vm_munmap+0x14/0x20\\n gcs_free+0x70/0x80\\n mm_release+0x1c/0xc8\\n exit_mm_release+0x28/0x38\\n do_exit+0x190/0x8ec\\n do_group_exit+0x34/0x90\\n get_signal+0x794/0x858\\n arch_do_signal_or_restart+0x11c/0x3e0\\n exit_to_user_mode_loop+0x10c/0x17c\\n el0_da+0x8c/0x9c\\n el0t_64_sync_handler+0xd0/0xf0\\n el0t_64_sync+0x198/0x19c\\n Code: aa1603e2 d34cfc00 cb813001 8b011861 (f9400420)\\n\\nSimilarly to how the kernel handles protection_map[], use a\\ngcs_page_prot variable to store the protection bits and clear PTE_SHARED\\nif LPA2 is enabled.\\n\\nAlso remove the unused PAGE_GCS{,_RO} macros.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1df3ef7e612d6ccbae5a48e1121553c47c2123d6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8a85b3131225a8c8143ba2ae29c0eef8c1f9117f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ca1684dd297bf0725c1d487cff80e615497accf6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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Sightings
| Author | Source | Type | Date |
|---|
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.
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