CVE-2025-39866 (GCVE-0-2025-39866)
Vulnerability from cvelistv5
Published
2025-09-19 15:26
Modified
2025-09-19 15:26
Severity ?
VLAI Severity ?
EPSS score ?
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.
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| ▼ | Linux | Linux |
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 |
||||||
|
|||||||||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"fs/fs-writeback.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "b187c976111960e6e54a6b1fff724f6e3d39406c",
"status": "affected",
"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
"versionType": "git"
},
{
"lessThan": "1edc2feb9c759a9883dfe81cb5ed231412d8b2e4",
"status": "affected",
"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
"versionType": "git"
},
{
"lessThan": "bf89b1f87c72df79cf76203f71fbf8349cd5c9de",
"status": "affected",
"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
"versionType": "git"
},
{
"lessThan": "e63052921f1b25a836feb1500b841bff7a4a0456",
"status": "affected",
"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
"versionType": "git"
},
{
"lessThan": "c8c14adf80bd1a6e4a1d7ee9c2a816881c26d17a",
"status": "affected",
"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
"versionType": "git"
},
{
"lessThan": "d02d2c98d25793902f65803ab853b592c7a96b29",
"status": "affected",
"version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"fs/fs-writeback.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.192",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.151",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.105",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.46",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.16.*",
"status": "unaffected",
"version": "6.16.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.17-rc3",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.192",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.151",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.105",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.46",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.16.6",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.17-rc3",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"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."
}
],
"providerMetadata": {
"dateUpdated": "2025-09-19T15:26:35.725Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/b187c976111960e6e54a6b1fff724f6e3d39406c"
},
{
"url": "https://git.kernel.org/stable/c/1edc2feb9c759a9883dfe81cb5ed231412d8b2e4"
},
{
"url": "https://git.kernel.org/stable/c/bf89b1f87c72df79cf76203f71fbf8349cd5c9de"
},
{
"url": "https://git.kernel.org/stable/c/e63052921f1b25a836feb1500b841bff7a4a0456"
},
{
"url": "https://git.kernel.org/stable/c/c8c14adf80bd1a6e4a1d7ee9c2a816881c26d17a"
},
{
"url": "https://git.kernel.org/stable/c/d02d2c98d25793902f65803ab853b592c7a96b29"
}
],
"title": "fs: writeback: fix use-after-free in __mark_inode_dirty()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2025-39866",
"datePublished": "2025-09-19T15:26:35.725Z",
"dateReserved": "2025-04-16T07:20:57.143Z",
"dateUpdated": "2025-09-19T15:26:35.725Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2025-39866\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-19T16:15:45.657\",\"lastModified\":\"2025-09-19T16:15:45.657\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/1edc2feb9c759a9883dfe81cb5ed231412d8b2e4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b187c976111960e6e54a6b1fff724f6e3d39406c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bf89b1f87c72df79cf76203f71fbf8349cd5c9de\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c8c14adf80bd1a6e4a1d7ee9c2a816881c26d17a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d02d2c98d25793902f65803ab853b592c7a96b29\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e63052921f1b25a836feb1500b841bff7a4a0456\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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