CVE-2025-21887

Description

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: <TASK> __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 ... </TASK>

Reserved 2024-12-29 | Published 2025-03-27 | Updated 2025-05-04 | Assigner Linux

Product status

Default status
unaffected

62f29ca45f832e281fc14966ac25f6ff3bd121ca before 4b49d939b5a79117f939b77cc67efae2694d9799
affected

e4f2a1feebb3f209a0fca82aa53507a5b8be4d53 before a7c41830ffcd17b2177a95a9b99b270302090c35
affected

b07d5cc93e1b28df47a72c519d09d0a836043613 before 64455c8051c3aedc71abb7ec8d47c80301f99f00
affected

b07d5cc93e1b28df47a72c519d09d0a836043613 before 3594aad97e7be2557ca9fa9c931b206b604028c8
affected

b07d5cc93e1b28df47a72c519d09d0a836043613 before 60b4b5c1277fc491da9e1e7abab307bfa39c2db7
affected

b07d5cc93e1b28df47a72c519d09d0a836043613 before c84e125fff2615b4d9c259e762596134eddd2f27
affected

714ba10a6dd19752a349e59aa875f3288ccb59b9
affected

33ab4dd6202f359558a0a2678b94d1b9994c17e5
affected

1ecdc55e5cd9f70f8d7513802971d4cffb9f77af
affected

Default status
affected

6.5
affected

Any version before 6.5
unaffected

5.15.179
unaffected

6.1.130
unaffected

6.6.81
unaffected

6.12.18
unaffected

6.13.6
unaffected

6.14
unaffected

References

git.kernel.org/...c/4b49d939b5a79117f939b77cc67efae2694d9799

git.kernel.org/...c/a7c41830ffcd17b2177a95a9b99b270302090c35

git.kernel.org/...c/64455c8051c3aedc71abb7ec8d47c80301f99f00

git.kernel.org/...c/3594aad97e7be2557ca9fa9c931b206b604028c8

git.kernel.org/...c/60b4b5c1277fc491da9e1e7abab307bfa39c2db7

git.kernel.org/...c/c84e125fff2615b4d9c259e762596134eddd2f27

cve.org (CVE-2025-21887)

nvd.nist.gov (CVE-2025-21887)

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