{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2026-23345", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-23345", "idYear": 2026, "status": "PUBLISHED", "publishedAt": "2026-03-25T10:27:32.432Z", "updatedAt": "2026-05-11T22:05:02.929Z", "importedAt": "2026-10-24T01:58:02.025Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "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:\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.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "6497b66ba6945f142902c7e8fce86e47016ead1c", "status": "affected", "versionType": "git", "lessThan": "ca1684dd297bf0725c1d487cff80e615497accf6" }, { "version": "6497b66ba6945f142902c7e8fce86e47016ead1c", "status": "affected", "versionType": "git", "lessThan": "1df3ef7e612d6ccbae5a48e1121553c47c2123d6" }, { "version": "6497b66ba6945f142902c7e8fce86e47016ead1c", "status": "affected", "versionType": "git", "lessThan": "8a85b3131225a8c8143ba2ae29c0eef8c1f9117f" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "6.13", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "6.13" }, { "version": "6.18.17", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.18.*" }, { "version": "6.19.7", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.19.*" }, { "version": "7.0", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }