ovl: fix UAF in ovl_dentry_update_reval by moving dput() in ovl_link_up
In the Linux kernel, the following vulnerability has been resolved: ovl: fix UAF in ovl_dentry_update_reval by moving dput() in ovl_link_up The issue was caused by dput(upper) being called before ovl_dentry_update_reval(), while upper->d_flags was still accessed in ovl_dentry_remote(). Move dput(upper) after its last use to prevent use-after-free. BUG: KASAN: slab-use-after-free in ovl_dentry_remote fs/overlayfs/util.c:162 [inline] BUG: KASAN: slab-use-after-free in ovl_dentry_update_reval+0xd2/0xf0 fs/overlayfs/util.c:167 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 print_address_description mm/kasan/report.c:377 [inline] print_report+0xc3/0x620 mm/kasan/report.c:488 kasan_report+0xd9/0x110 mm/kasan/report.c:601 ovl_dentry_remote fs/overlayfs/util.c:162 [inline] ovl_dentry_update_reval+0xd2/0xf0 fs/overlayfs/util.c:167 ovl_link_up fs/overlayfs/copy_up.c:610 [inline] ovl_copy_up_one+0x2105/0x3490 fs/overlayfs/copy_up.c:1170 ovl_copy_up_flags+0x18d/0x200 fs/overlayfs/copy_up.c:1223 ovl_rename+0x39e/0x18c0 fs/overlayfs/dir.c:1136 vfs_rename+0xf84/0x20a0 fs/namei.c:4893 ...
CVE-2025-21887
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-2025-21887
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": "714ba10a6dd19752a349e59aa875f3288ccb59b9",
"lessThan": "f77618291836168eca99e89cd175256f928f5e64",
"versionType": "git"
},
{
"status": "affected",
"version": "62f29ca45f832e281fc14966ac25f6ff3bd121ca",
"lessThan": "4b49d939b5a79117f939b77cc67efae2694d9799",
"versionType": "git"
},
{
"status": "affected",
"version": "e4f2a1feebb3f209a0fca82aa53507a5b8be4d53",
"lessThan": "a7c41830ffcd17b2177a95a9b99b270302090c35",
"versionType": "git"
},
{
"status": "affected",
"version": "b07d5cc93e1b28df47a72c519d09d0a836043613",
"lessThan": "64455c8051c3aedc71abb7ec8d47c80301f99f00",
"versionType": "git"
},
{
"status": "affected",
"version": "b07d5cc93e1b28df47a72c519d09d0a836043613",
"lessThan": "3594aad97e7be2557ca9fa9c931b206b604028c8",
"versionType": "git"
},
{
"status": "affected",
"version": "b07d5cc93e1b28df47a72c519d09d0a836043613",
"lessThan": "60b4b5c1277fc491da9e1e7abab307bfa39c2db7",
"versionType": "git"
},
{
"status": "affected",
"version": "b07d5cc93e1b28df47a72c519d09d0a836043613",
"lessThan": "c84e125fff2615b4d9c259e762596134eddd2f27",
"versionType": "git"
},
{
"status": "affected",
"version": "33ab4dd6202f359558a0a2678b94d1b9994c17e5",
"versionType": "git"
},
{
"status": "affected",
"version": "1ecdc55e5cd9f70f8d7513802971d4cffb9f77af",
"versionType": "git"
},
{
"status": "affected",
"version": "5.10.188",
"lessThan": "5.10.247",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.15.121",
"lessThan": "5.15.179",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.1.39",
"lessThan": "6.1.130",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.3.13",
"lessThan": "6.4",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.4.4",
"lessThan": "6.5",
"versionType": "semver"
}
],
"programFiles": [
"fs/overlayfs/copy_up.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.5"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.5",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.247",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.179",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.130",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.81",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.18",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.13.6",
"versionType": "semver",
"lessThanOrEqual": "6.13.*"
},
{
"status": "unaffected",
"version": "6.14",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/overlayfs/copy_up.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-21887
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #26968 · Revision 1
- Added to Heist Feed
- Publisher date