CVE-2025-39775 (GCVE-0-2025-39775)

Vulnerability from cvelistv5 – Published: 2025-09-11 16:56 – Updated: 2026-10-30 12:22
VLAI
Title
mm/mremap: fix WARN with uffd that has remap events disabled
Summary
In the Linux kernel, the following vulnerability has been resolved: mm/mremap: fix WARN with uffd that has remap events disabled Registering userfaultd on a VMA that spans at least one PMD and then mremap()'ing that VMA can trigger a WARN when recovering from a failed page table move due to a page table allocation error. The code ends up doing the right thing (recurse, avoiding moving actual page tables), but triggering that WARN is unpleasant: WARNING: CPU: 2 PID: 6133 at mm/mremap.c:357 move_normal_pmd mm/mremap.c:357 [inline] WARNING: CPU: 2 PID: 6133 at mm/mremap.c:357 move_pgt_entry mm/mremap.c:595 [inline] WARNING: CPU: 2 PID: 6133 at mm/mremap.c:357 move_page_tables+0x3832/0x44a0 mm/mremap.c:852 Modules linked in: CPU: 2 UID: 0 PID: 6133 Comm: syz.0.19 Not tainted 6.17.0-rc1-syzkaller-00004-g53e760d89498 #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:move_normal_pmd mm/mremap.c:357 [inline] RIP: 0010:move_pgt_entry mm/mremap.c:595 [inline] RIP: 0010:move_page_tables+0x3832/0x44a0 mm/mremap.c:852 Code: ... RSP: 0018:ffffc900037a76d8 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 0000000032930007 RCX: ffffffff820c6645 RDX: ffff88802e56a440 RSI: ffffffff820c7201 RDI: 0000000000000007 RBP: ffff888037728fc0 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000032930007 R11: 0000000000000000 R12: 0000000000000000 R13: ffffc900037a79a8 R14: 0000000000000001 R15: dffffc0000000000 FS: 000055556316a500(0000) GS:ffff8880d68bc000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30863fff CR3: 0000000050171000 CR4: 0000000000352ef0 Call Trace: <TASK> copy_vma_and_data+0x468/0x790 mm/mremap.c:1215 move_vma+0x548/0x1780 mm/mremap.c:1282 mremap_to+0x1b7/0x450 mm/mremap.c:1406 do_mremap+0xfad/0x1f80 mm/mremap.c:1921 __do_sys_mremap+0x119/0x170 mm/mremap.c:1977 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f00d0b8ebe9 Code: ... RSP: 002b:00007ffe5ea5ee98 EFLAGS: 00000246 ORIG_RAX: 0000000000000019 RAX: ffffffffffffffda RBX: 00007f00d0db5fa0 RCX: 00007f00d0b8ebe9 RDX: 0000000000400000 RSI: 0000000000c00000 RDI: 0000200000000000 RBP: 00007ffe5ea5eef0 R08: 0000200000c00000 R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000002 R13: 00007f00d0db5fa0 R14: 00007f00d0db5fa0 R15: 0000000000000005 </TASK> The underlying issue is that we recurse during the original page table move, but not during the recovery move. Fix it by checking for both VMAs and performing the check before the pmd_none() sanity check. Add a new helper where we perform+document that check for the PMD and PUD level. Thanks to Harry for bisecting.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6637 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 310ac886d68de661c3a334198d8604b722d7fdf8 , < 1c15b4cd3a97aea013bdb18d9a55ca0384fbb8d4 (git)
Affected: 0cef0bb836e3cfe00f08f9606c72abd72fe78ca3 , < d70ca21f7bff162a5afae1ddd6f4107adf05ae23 (git)
Affected: 0cef0bb836e3cfe00f08f9606c72abd72fe78ca3 , < 772e5b4a5e8360743645b9a466842d16092c4f94 (git)
Affected: 96fed9f20481d07eba8a7fe93bc77abef178198c (git)
Affected: 8e2f6ba256dd1e590addc48e6e9577bf39c482f2 (git)
Affected: 6.12.11 , < 6.12.114 (semver)
Affected: 6.1.191 , < 6.2 (semver)
Affected: 6.6.160 , < 6.7 (semver)
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Linux Linux Affected: 6.13
Unaffected: 0 , < 6.13 (semver)
Unaffected: 6.12.114 , ≤ 6.12.* (semver)
Unaffected: 6.16.4 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm/mremap: fix WARN with uffd that has remap events disabled\n\nRegistering userfaultd on a VMA that spans at least one PMD and then\nmremap()\u0027ing that VMA can trigger a WARN when recovering from a failed\npage table move due to a page table allocation error.\n\nThe code ends up doing the right thing (recurse, avoiding moving actual\npage tables), but triggering that WARN is unpleasant:\n\nWARNING: CPU: 2 PID: 6133 at mm/mremap.c:357 move_normal_pmd mm/mremap.c:357 [inline]\nWARNING: CPU: 2 PID: 6133 at mm/mremap.c:357 move_pgt_entry mm/mremap.c:595 [inline]\nWARNING: CPU: 2 PID: 6133 at mm/mremap.c:357 move_page_tables+0x3832/0x44a0 mm/mremap.c:852\nModules linked in:\nCPU: 2 UID: 0 PID: 6133 Comm: syz.0.19 Not tainted 6.17.0-rc1-syzkaller-00004-g53e760d89498 #0 PREEMPT(full)\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014\nRIP: 0010:move_normal_pmd mm/mremap.c:357 [inline]\nRIP: 0010:move_pgt_entry mm/mremap.c:595 [inline]\nRIP: 0010:move_page_tables+0x3832/0x44a0 mm/mremap.c:852\nCode: ...\nRSP: 0018:ffffc900037a76d8 EFLAGS: 00010293\nRAX: 0000000000000000 RBX: 0000000032930007 RCX: ffffffff820c6645\nRDX: ffff88802e56a440 RSI: ffffffff820c7201 RDI: 0000000000000007\nRBP: ffff888037728fc0 R08: 0000000000000007 R09: 0000000000000000\nR10: 0000000032930007 R11: 0000000000000000 R12: 0000000000000000\nR13: ffffc900037a79a8 R14: 0000000000000001 R15: dffffc0000000000\nFS:  000055556316a500(0000) GS:ffff8880d68bc000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000001b30863fff CR3: 0000000050171000 CR4: 0000000000352ef0\nCall Trace:\n \u003cTASK\u003e\n copy_vma_and_data+0x468/0x790 mm/mremap.c:1215\n move_vma+0x548/0x1780 mm/mremap.c:1282\n mremap_to+0x1b7/0x450 mm/mremap.c:1406\n do_mremap+0xfad/0x1f80 mm/mremap.c:1921\n __do_sys_mremap+0x119/0x170 mm/mremap.c:1977\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7f00d0b8ebe9\nCode: ...\nRSP: 002b:00007ffe5ea5ee98 EFLAGS: 00000246 ORIG_RAX: 0000000000000019\nRAX: ffffffffffffffda RBX: 00007f00d0db5fa0 RCX: 00007f00d0b8ebe9\nRDX: 0000000000400000 RSI: 0000000000c00000 RDI: 0000200000000000\nRBP: 00007ffe5ea5eef0 R08: 0000200000c00000 R09: 0000000000000000\nR10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000002\nR13: 00007f00d0db5fa0 R14: 00007f00d0db5fa0 R15: 0000000000000005\n \u003c/TASK\u003e\n\nThe underlying issue is that we recurse during the original page table\nmove, but not during the recovery move.\n\nFix it by checking for both VMAs and performing the check before the\npmd_none() sanity check.\n\nAdd a new helper where we perform+document that check for the PMD and PUD\nlevel.\n\nThanks to Harry for bisecting."
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          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nmm/mremap: solucionar WARN con uffd que tiene los eventos de reasignaci\u00f3n deshabilitados\n\nRegistrar userfaultd en un VMA que abarca al menos un PMD y luego hacer mremap() de ese VMA puede activar un WARN al recuperarse de un movimiento fallido de la tabla de p\u00e1ginas debido a un error de asignaci\u00f3n de la tabla de p\u00e1ginas.\n\nEl c\u00f3digo termina haciendo lo correcto (recurrir, evitando mover las tablas de p\u00e1ginas reales), pero activar ese WARN es desagradable:\n\nWARNING: CPU: 2 PID: 6133 at mm/mremap.c:357 move_normal_pmd mm/mremap.c:357 [inline]\nWARNING: CPU: 2 PID: 6133 at mm/mremap.c:357 move_pgt_entry mm/mremap.c:595 [inline]\nWARNING: CPU: 2 PID: 6133 at mm/mremap.c:357 move_page_tables+0x3832/0x44a0 mm/mremap.c:852\nModules linked in:\nCPU: 2 UID: 0 PID: 6133 Comm: syz.0.19 Not tainted 6.17.0-rc1-syzkaller-00004-g53e760d89498 #0 PREEMPT(full)\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014\nRIP: 0010:move_normal_pmd mm/mremap.c:357 [inline]\nRIP: 0010:move_pgt_entry mm/mremap.c:595 [inline]\nRIP: 0010:move_page_tables+0x3832/0x44a0 mm/mremap.c:852\nCode: ...\nRSP: 0018:ffffc900037a76d8 EFLAGS: 00010293\nRAX: 0000000000000000 RBX: 0000000032930007 RCX: ffffffff820c6645\nRDX: ffff88802e56a440 RSI: ffffffff820c7201 RDI: 0000000000000007\nRBP: ffff888037728fc0 R08: 0000000000000007 R09: 0000000000000000\nR10: 0000000032930007 R11: 0000000000000000 R12: 0000000000000000\nR13: ffffc900037a79a8 R14: 0000000000000001 R15: dffffc0000000000\nFS:  000055556316a500(0000) GS:ffff8880d68bc000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 0000001b30863fff CR3: 0000000050171000 CR4: 0000000000352ef0\nCall Trace:\n \u003cTASK\u003e\n copy_vma_and_data+0x468/0x790 mm/mremap.c:1215\n move_vma+0x548/0x1780 mm/mremap.c:1282\n mremap_to+0x1b7/0x450 mm/mremap.c:1406\n do_mremap+0xfad/0x1f80 mm/mremap.c:1921\n __do_sys_mremap+0x119/0x170 mm/mremap.c:1977\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7f00d0b8ebe9\nCode: ...\nRSP: 002b:00007ffe5ea5ee98 EFLAGS: 00000246 ORIG_RAX: 0000000000000019\nRAX: ffffffffffffffda RBX: 00007f00d0db5fa0 RCX: 00007f00d0b8ebe9\nRDX: 0000000000400000 RSI: 0000000000c00000 RDI: 0000200000000000\nRBP: 00007ffe5ea5eef0 R08: 0000200000c00000 R09: 0000000000000000\nR10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000002\nR13: 00007f00d0db5fa0 R14: 00007f00d0db5fa0 R15: 0000000000000005\n \u003c/TASK\u003e\n\nEl problema subyacente es que recurrimos durante el movimiento original de la tabla de p\u00e1ginas, pero no durante el movimiento de recuperaci\u00f3n.\n\nSolucionarlo comprobando ambos VMAs y realizando la comprobaci\u00f3n antes de la verificaci\u00f3n de cordura pmd_none().\n\nA\u00f1adir una nueva funci\u00f3n auxiliar donde realizamos y documentamos esa comprobaci\u00f3n para el nivel PMD y PUD.\n\nGracias a Harry por hacer la bisecci\u00f3n."
          }
        ],
        "id": "CVE-2025-39775",
        "lastModified": "2026-10-30T13:18:09.563",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 5.5,
                "baseSeverity": "MEDIUM",
                "confidentialityImpact": "NONE",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 3.6,
              "source": "nvd@nist.gov",
              "type": "Primary"
            }
          ]
        },
        "published": "2025-09-11T17:15:43.320",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/1c15b4cd3a97aea013bdb18d9a55ca0384fbb8d4"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/772e5b4a5e8360743645b9a466842d16092c4f94"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/d70ca21f7bff162a5afae1ddd6f4107adf05ae23"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "NVD-CWE-noinfo"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-05T15:11:17+00:00",
      "cve": "CVE-2025-39775",
      "id": "CVE-2025-39775",
      "initial_release_date": "2025-09-11T00:00:00+00:00",
      "product_status:known_affected": "124",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: mremap local denial of service",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39775.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-11-04T01:46:53Z",
      "cve": "CVE-2025-39775",
      "id": "CVE-2025-39775",
      "initial_release_date": "2025-09-11T23:23:56Z",
      "product_status:known_affected": "223",
      "product_status:known_not_affected": "0",
      "product_status:recommended": "185",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-39775",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2025/cve-2025-39775.json",
      "version": "36"
    }
  }
}



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