CVE-2025-39866 (GCVE-0-2025-39866)

Vulnerability from cvelistv5 – Published: 2025-09-19 15:26 – Updated: 2026-10-15 22:02
VLAI
Title
fs: writeback: fix use-after-free in __mark_inode_dirty()
Summary
In the Linux kernel, the following vulnerability has been resolved: fs: writeback: fix use-after-free in __mark_inode_dirty() An use-after-free issue occurred when __mark_inode_dirty() get the bdi_writeback that was in the progress of switching. CPU: 1 PID: 562 Comm: systemd-random- Not tainted 6.6.56-gb4403bd46a8e #1 ...... pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __mark_inode_dirty+0x124/0x418 lr : __mark_inode_dirty+0x118/0x418 sp : ffffffc08c9dbbc0 ........ Call trace: __mark_inode_dirty+0x124/0x418 generic_update_time+0x4c/0x60 file_modified+0xcc/0xd0 ext4_buffered_write_iter+0x58/0x124 ext4_file_write_iter+0x54/0x704 vfs_write+0x1c0/0x308 ksys_write+0x74/0x10c __arm64_sys_write+0x1c/0x28 invoke_syscall+0x48/0x114 el0_svc_common.constprop.0+0xc0/0xe0 do_el0_svc+0x1c/0x28 el0_svc+0x40/0xe4 el0t_64_sync_handler+0x120/0x12c el0t_64_sync+0x194/0x198 Root cause is: systemd-random-seed kworker ---------------------------------------------------------------------- ___mark_inode_dirty inode_switch_wbs_work_fn spin_lock(&inode->i_lock); inode_attach_wb locked_inode_to_wb_and_lock_list get inode->i_wb spin_unlock(&inode->i_lock); spin_lock(&wb->list_lock) spin_lock(&inode->i_lock) inode_io_list_move_locked spin_unlock(&wb->list_lock) spin_unlock(&inode->i_lock) spin_lock(&old_wb->list_lock) inode_do_switch_wbs spin_lock(&inode->i_lock) inode->i_wb = new_wb spin_unlock(&inode->i_lock) spin_unlock(&old_wb->list_lock) wb_put_many(old_wb, nr_switched) cgwb_release old wb released wb_wakeup_delayed() accesses wb, then trigger the use-after-free issue Fix this race condition by holding inode spinlock until wb_wakeup_delayed() finished.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-15 21:54 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6993 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 0747259d13febfcc838980a63c414c9b920cea6f , < e2a14bbae5d8bacaa301362744a110e2be40a3a3 (git)
Affected: 0747259d13febfcc838980a63c414c9b920cea6f , < b187c976111960e6e54a6b1fff724f6e3d39406c (git)
Affected: 0747259d13febfcc838980a63c414c9b920cea6f , < 1edc2feb9c759a9883dfe81cb5ed231412d8b2e4 (git)
Affected: 0747259d13febfcc838980a63c414c9b920cea6f , < bf89b1f87c72df79cf76203f71fbf8349cd5c9de (git)
Affected: 0747259d13febfcc838980a63c414c9b920cea6f , < e63052921f1b25a836feb1500b841bff7a4a0456 (git)
Affected: 0747259d13febfcc838980a63c414c9b920cea6f , < c8c14adf80bd1a6e4a1d7ee9c2a816881c26d17a (git)
Affected: 0747259d13febfcc838980a63c414c9b920cea6f , < d02d2c98d25793902f65803ab853b592c7a96b29 (git)
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Linux Linux Affected: 4.2
Unaffected: 0 , < 4.2 (semver)
Unaffected: 5.10.247 , ≤ 5.10.* (semver)
Unaffected: 5.15.192 , ≤ 5.15.* (semver)
Unaffected: 6.1.151 , ≤ 6.1.* (semver)
Unaffected: 6.6.105 , ≤ 6.6.* (semver)
Unaffected: 6.12.46 , ≤ 6.12.* (semver)
Unaffected: 6.16.6 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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Siemens SIMATIC CN 4100 Affected: 0 , < V5.0 (custom)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.7 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.7 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.7 , < * (custom)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs: writeback: fix use-after-free in __mark_inode_dirty()\n\nAn use-after-free issue occurred when __mark_inode_dirty() get the\nbdi_writeback that was in the progress of switching.\n\nCPU: 1 PID: 562 Comm: systemd-random- Not tainted 6.6.56-gb4403bd46a8e #1\n......\npstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\npc : __mark_inode_dirty+0x124/0x418\nlr : __mark_inode_dirty+0x118/0x418\nsp : ffffffc08c9dbbc0\n........\nCall trace:\n __mark_inode_dirty+0x124/0x418\n generic_update_time+0x4c/0x60\n file_modified+0xcc/0xd0\n ext4_buffered_write_iter+0x58/0x124\n ext4_file_write_iter+0x54/0x704\n vfs_write+0x1c0/0x308\n ksys_write+0x74/0x10c\n __arm64_sys_write+0x1c/0x28\n invoke_syscall+0x48/0x114\n el0_svc_common.constprop.0+0xc0/0xe0\n do_el0_svc+0x1c/0x28\n el0_svc+0x40/0xe4\n el0t_64_sync_handler+0x120/0x12c\n el0t_64_sync+0x194/0x198\n\nRoot cause is:\n\nsystemd-random-seed                         kworker\n----------------------------------------------------------------------\n___mark_inode_dirty                     inode_switch_wbs_work_fn\n\n  spin_lock(\u0026inode-\u003ei_lock);\n  inode_attach_wb\n  locked_inode_to_wb_and_lock_list\n     get inode-\u003ei_wb\n     spin_unlock(\u0026inode-\u003ei_lock);\n     spin_lock(\u0026wb-\u003elist_lock)\n  spin_lock(\u0026inode-\u003ei_lock)\n  inode_io_list_move_locked\n  spin_unlock(\u0026wb-\u003elist_lock)\n  spin_unlock(\u0026inode-\u003ei_lock)\n                                    spin_lock(\u0026old_wb-\u003elist_lock)\n                                      inode_do_switch_wbs\n                                        spin_lock(\u0026inode-\u003ei_lock)\n                                        inode-\u003ei_wb = new_wb\n                                        spin_unlock(\u0026inode-\u003ei_lock)\n                                    spin_unlock(\u0026old_wb-\u003elist_lock)\n                                    wb_put_many(old_wb, nr_switched)\n                                      cgwb_release\n                                      old wb released\n  wb_wakeup_delayed() accesses wb,\n  then trigger the use-after-free\n  issue\n\nFix this race condition by holding inode spinlock until\nwb_wakeup_delayed() finished."
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            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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              "value": "AV:L - The vulnerable code is reached from an ordinary write(2) syscall (vfs_write \u2192 ext4_buffered_write_iter \u2192 file_modified \u2192 generic_update_time \u2192 __mark_inode_dirty), and the competing side requires local cgroup/writeback activity. No network protocol handler is involved.\nAC:L - The attacker drives both sides of the race \u2014 a multi-threaded write() loop dirties the inode while the attacker forces cgroup writeback switches by dirtying the file from a second memcg and tearing that cgroup down, making the old wb\u0027s last reference drop. Attempts are unlimited and the bug was observed occurring spontaneously during normal boot, and CONFIG_CGROUP_WRITEBACK is default-y on all mainstream kernels.\nPR:L - Only an unprivileged local account with write access to a file on a writeback-capable filesystem (ext4/xfs home or /tmp) is needed; cgroup manipulation used to widen the race is available to ordinary users through systemd\u0027s delegated per-user cgroup subtree.\nUI:N - The attacker triggers everything itself through its own write() syscalls and cgroup activity; no victim action or interaction is required.\nS:U - The use-after-free corrupts kernel heap memory within the same kernel security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - The freed bdi_writeback is dereferenced as `wb-\u003ebdi-\u003ecapabilities`, so a re-sprayed object yields an attacker-controlled pointer dereference and an arbitrary kernel-memory read primitive, enabling disclosure of arbitrary kernel data.\nI:H - wb_wakeup_delayed() writes into the freed object (spin_lock_irq on wb-\u003ework_lock) and inserts the freed `wb-\u003edwork` timer into the timer wheel, giving list-write primitives and an attacker-controlled `timer-\u003efunction` \u2014 a direct control-flow hijack path to arbitrary kernel code execution.\nA:H - The use-after-free reliably produces a kernel oops/panic as reported in the original crash trace (__mark_inode_dirty+0x124), and can be triggered repeatedly to crash the system."
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            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs: writeback: fix use-after-free in __mark_inode_dirty()\n\nAn use-after-free issue occurred when __mark_inode_dirty() get the\nbdi_writeback that was in the progress of switching.\n\nCPU: 1 PID: 562 Comm: systemd-random- Not tainted 6.6.56-gb4403bd46a8e #1\n......\npstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\npc : __mark_inode_dirty+0x124/0x418\nlr : __mark_inode_dirty+0x118/0x418\nsp : ffffffc08c9dbbc0\n........\nCall trace:\n __mark_inode_dirty+0x124/0x418\n generic_update_time+0x4c/0x60\n file_modified+0xcc/0xd0\n ext4_buffered_write_iter+0x58/0x124\n ext4_file_write_iter+0x54/0x704\n vfs_write+0x1c0/0x308\n ksys_write+0x74/0x10c\n __arm64_sys_write+0x1c/0x28\n invoke_syscall+0x48/0x114\n el0_svc_common.constprop.0+0xc0/0xe0\n do_el0_svc+0x1c/0x28\n el0_svc+0x40/0xe4\n el0t_64_sync_handler+0x120/0x12c\n el0t_64_sync+0x194/0x198\n\nRoot cause is:\n\nsystemd-random-seed                         kworker\n----------------------------------------------------------------------\n___mark_inode_dirty                     inode_switch_wbs_work_fn\n\n  spin_lock(\u0026inode-\u003ei_lock);\n  inode_attach_wb\n  locked_inode_to_wb_and_lock_list\n     get inode-\u003ei_wb\n     spin_unlock(\u0026inode-\u003ei_lock);\n     spin_lock(\u0026wb-\u003elist_lock)\n  spin_lock(\u0026inode-\u003ei_lock)\n  inode_io_list_move_locked\n  spin_unlock(\u0026wb-\u003elist_lock)\n  spin_unlock(\u0026inode-\u003ei_lock)\n                                    spin_lock(\u0026old_wb-\u003elist_lock)\n                                      inode_do_switch_wbs\n                                        spin_lock(\u0026inode-\u003ei_lock)\n                                        inode-\u003ei_wb = new_wb\n                                        spin_unlock(\u0026inode-\u003ei_lock)\n                                    spin_unlock(\u0026old_wb-\u003elist_lock)\n                                    wb_put_many(old_wb, nr_switched)\n                                      cgwb_release\n                                      old wb released\n  wb_wakeup_delayed() accesses wb,\n  then trigger the use-after-free\n  issue\n\nFix this race condition by holding inode spinlock until\nwb_wakeup_delayed() finished."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nfs: writeback: corrige uso despu\u00e9s de liberaci\u00f3n en __mark_inode_dirty()\n\nSe produjo un problema de uso despu\u00e9s de liberaci\u00f3n cuando __mark_inode_dirty() obtiene el bdi_writeback que estaba en proceso de cambio.\n\nCPU: 1 PID: 562 Comm: systemd-random- No contaminado 6.6.56-gb4403bd46a8e #1\n......\npstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)\npc : __mark_inode_dirty+0x124/0x418\nlr : __mark_inode_dirty+0x118/0x418\nsp : ffffffc08c9dbbc0\n........\nTraza de llamada:\n __mark_inode_dirty+0x124/0x418\n generic_update_time+0x4c/0x60\n file_modified+0xcc/0xd0\n ext4_buffered_write_iter+0x58/0x124\n ext4_file_write_iter+0x54/0x704\n vfs_write+0x1c0/0x308\n ksys_write+0x74/0x10c\n __arm64_sys_write+0x1c/0x28\n invoke_syscall+0x48/0x114\n el0_svc_common.constprop.0+0xc0/0xe0\n do_el0_svc+0x1c/0x28\n el0_svc+0x40/0xe4\n el0t_64_sync_handler+0x120/0x12c\n el0t_64_sync+0x194/0x198\n\nLa causa ra\u00edz es:\n\nsystemd-random-seed                         kworker\n----------------------------------------------------------------------\n___mark_inode_dirty                     inode_switch_wbs_work_fn\n\n  spin_lock(\u0026inode-\u003ei_lock);\n  inode_attach_wb\n  locked_inode_to_wb_and_lock_list\n     obtiene inode-\u003ei_wb\n     spin_unlock(\u0026inode-\u003ei_lock);\n     spin_lock(\u0026wb-\u003elist_lock)\n  spin_lock(\u0026inode-\u003ei_lock)\n  inode_io_list_move_locked\n  spin_unlock(\u0026wb-\u003elist_lock)\n  spin_unlock(\u0026inode-\u003ei_lock)\n                                    spin_lock(\u0026old_wb-\u003elist_lock)\n                                      inode_do_switch_wbs\n                                        spin_lock(\u0026inode-\u003ei_lock)\n                                        inode-\u003ei_wb = new_wb\n                                        spin_unlock(\u0026inode-\u003ei_lock)\n                                    spin_unlock(\u0026old_wb-\u003elist_lock)\n                                    wb_put_many(old_wb, nr_switched)\n                                      cgwb_release\n                                      old wb liberado\n  wb_wakeup_delayed() accede a wb,\n  luego activa el uso despu\u00e9s de liberaci\u00f3n\n  problema\n\nCorrige esta condici\u00f3n de carrera manteniendo el spinlock del inodo hasta que wb_wakeup_delayed() finalice."
          }
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        "id": "CVE-2025-39866",
        "lastModified": "2026-10-19T21:10:00.160",
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            "url": "https://git.kernel.org/stable/c/bf89b1f87c72df79cf76203f71fbf8349cd5c9de"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/c8c14adf80bd1a6e4a1d7ee9c2a816881c26d17a"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/d02d2c98d25793902f65803ab853b592c7a96b29"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/e2a14bbae5d8bacaa301362744a110e2be40a3a3"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "tags": [
              "Patch"
            ],
            "url": "https://git.kernel.org/stable/c/e63052921f1b25a836feb1500b841bff7a4a0456"
          },
          {
            "source": "af854a3a-2127-422b-91ae-364da2661108",
            "tags": [
              "Third Party Advisory"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
          },
          {
            "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
          },
          {
            "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-032379.html"
          },
          {
            "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"
          },
          {
            "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-416"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-15T14:41:14+00:00",
      "cve": "CVE-2025-39866",
      "id": "CVE-2025-39866",
      "initial_release_date": "2025-09-19T00:00:00+00:00",
      "product_status:fixed": "612",
      "product_status:known_affected": "98",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: fs: writeback: fix use-after-free in __mark_inode_dirty()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39866.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-15T16:31:52Z",
      "cve": "CVE-2025-39866",
      "id": "CVE-2025-39866",
      "initial_release_date": "2025-09-19T23:23:38Z",
      "product_status:known_affected": "731",
      "product_status:recommended": "532",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-39866",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2025/cve-2025-39866.json",
      "version": "58"
    }
  }
}



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