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fs: writeback: fix use-after-free in __mark_inode_dirty()

Type: advisorySource: Official CVE List1 source record

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_

Announced Source revision 1
Original source ↗

CVE-2025-39866

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2025-39866

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "0747259d13febfcc838980a63c414c9b920cea6f",
        "lessThan": "e2a14bbae5d8bacaa301362744a110e2be40a3a3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0747259d13febfcc838980a63c414c9b920cea6f",
        "lessThan": "b187c976111960e6e54a6b1fff724f6e3d39406c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0747259d13febfcc838980a63c414c9b920cea6f",
        "lessThan": "1edc2feb9c759a9883dfe81cb5ed231412d8b2e4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0747259d13febfcc838980a63c414c9b920cea6f",
        "lessThan": "bf89b1f87c72df79cf76203f71fbf8349cd5c9de",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0747259d13febfcc838980a63c414c9b920cea6f",
        "lessThan": "e63052921f1b25a836feb1500b841bff7a4a0456",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0747259d13febfcc838980a63c414c9b920cea6f",
        "lessThan": "c8c14adf80bd1a6e4a1d7ee9c2a816881c26d17a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "0747259d13febfcc838980a63c414c9b920cea6f",
        "lessThan": "d02d2c98d25793902f65803ab853b592c7a96b29",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "fs/fs-writeback.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.2"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.2",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.247",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.192",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.151",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.105",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.46",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.16.6",
        "versionType": "semver",
        "lessThanOrEqual": "6.16.*"
      },
      {
        "status": "unaffected",
        "version": "6.17",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/fs-writeback.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2025-39866

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#30634 · Revision 1
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Publisher date
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