{
  "cveId": "CVE-2026-23345",
  "url": "https://patchblox.com/security/cve/CVE-2026-23345",
  "summary": "CVE-2026-23345 is fixed in 23 products on 1 platform, first by DEBIAN-CVE-2026-23345, released March 25, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  arm64: gcs: Do not set PTE_SHARED on GCS mapping...",
  "description": "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\u002Bdeb13u1 11/08/2025   pstate: 03402005 (nzcv daif \u002BPAN -UAO \u002BTCO \u002BDIT -SSBS BTYPE=--)   pc : zap_huge_pmd\u002B0x168/0x468   lr : zap_huge_pmd\u002B0x2c/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\u002B0x168/0x468 (P)    unmap_page_range\u002B0xd70/0x1560    unmap_single_vma\u002B0x48/0x80    unmap_vmas\u002B0x90/0x180    unmap_region\u002B0x88/0xe4    vms_complete_munmap_vmas\u002B0xf8/0x1e0    do_vmi_align_munmap\u002B0x158/0x180    do_vmi_munmap\u002B0xac/0x160    __vm_munmap\u002B0xb0/0x138    vm_munmap\u002B0x14/0x20    gcs_free\u002B0x70/0x80    mm_release\u002B0x1c/0xc8    exit_mm_release\u002B0x28/0x38    do_exit\u002B0x190/0x8ec    do_group_exit\u002B0x34/0x90    get_signal\u002B0x794/0x858    arch_do_signal_or_restart\u002B0x11c/0x3e0    exit_to_user_mode_loop\u002B0x10c/0x17c    el0_da\u002B0x8c/0x9c    el0t_64_sync_handler\u002B0xd0/0xf0    el0t_64_sync\u002B0x198/0x19c   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.",
  "published": "2026-03-25T11:16:32Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00125,
  "epssPercentile": 0.02251,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "bpftool6.18",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.20-20.229.amzn2023",
      "fix": "ALAS2023-2026-1596",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1596",
      "released": "2026-04-27T09:00:00Z"
    },
    {
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      "product": "bpftool6.18-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.20-20.229.amzn2023",
      "fix": "ALAS2023-2026-1596",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1596",
      "released": "2026-04-27T09:00:00Z"
    },
    {
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      "release": "amzn 2023",
      "fixedVersion": "1:1.0-0.amzn2023",
      "fix": "ALAS2023-2026-1596",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1596",
      "released": "2026-04-27T09:00:00Z"
    },
    {
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      "release": "amzn 2023",
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      "fix": "ALAS2023-2026-1596",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1596",
      "released": "2026-04-27T09:00:00Z"
    },
    {
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      "fix": "ALAS2023-2026-1596",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1596",
      "released": "2026-04-27T09:00:00Z"
    },
    {
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      "product": "kernel6.18-debuginfo-common-aarch64",
      "release": "amzn 2023",
      "fixedVersion": "1:6.18.20-20.229.amzn2023",
      "fix": "ALAS2023-2026-1596",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1596",
      "released": "2026-04-27T09:00:00Z"
    },
    {
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      "fix": "ALAS2023-2026-1596",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1596",
      "released": "2026-04-27T09:00:00Z"
    },
    {
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      "fix": "ALAS2023-2026-1596",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1596",
      "released": "2026-04-27T09:00:00Z"
    },
    {
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      "product": "kernel6.18-headers",
      "release": "amzn 2023",
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      "fix": "ALAS2023-2026-1596",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1596",
      "released": "2026-04-27T09:00:00Z"
    },
    {
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      "fix": "ALAS2023-2026-1596",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1596",
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    },
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      "fix": "ALAS2023-2026-1596",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1596",
      "released": "2026-04-27T09:00:00Z"
    },
    {
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      "fix": "ALAS2023-2026-1596",
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      "released": "2026-04-27T09:00:00Z"
    },
    {
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      "fix": "ALAS2023-2026-1596",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1596",
      "released": "2026-04-27T09:00:00Z"
    },
    {
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      "fix": "ALAS2023-2026-1596",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1596",
      "released": "2026-04-27T09:00:00Z"
    },
    {
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      "fix": "ALAS2023-2026-1596",
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      "fix": "ALAS2023-2026-1596",
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      "fix": "ALAS2023-2026-1596",
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      "fix": "ALAS2023-2026-1596",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1596",
      "released": "2026-04-27T09:00:00Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "6.19.8-1",
      "fix": "DEBIAN-CVE-2026-23345",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-23345",
      "released": "2026-03-25T11:16:32Z"
    },
    {
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      "product": "perf6.18",
      "release": "amzn 2023",
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      "fix": "ALAS2023-2026-1596",
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    },
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      "url": "https://patchblox.com/security/fix/linux/alas2023-2026-1596",
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      "released": "2026-04-27T09:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}