[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"repo-stars":3,"vuln-DEBIAN-CVE-2025-21887":6},{"stargazers_count":4,"fetched_at":5},7,"2026-06-04T08:53:30.047Z",{"id":7,"descriptions":8,"cisa":9,"weaknesses":10,"exploits":11,"aliases":12,"duplicate_of":9,"upstream":13,"downstream":16,"duplicates":21,"related":22,"reserved_at":9,"published_at":23,"modified_at":24,"state":9,"summary":25,"references_raw":27,"kevs":34,"epss":9,"epss_history":35,"metrics":36,"affected":43},"DEBIAN-CVE-2025-21887","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:  \u003CTASK>  __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 ...  \u003C/TASK>",null,[],[],[],[14],{"_key":15},"CVE-2025-21887",[17,19],{"_key":18},"DLA-4193-1",{"_key":20},"DSA-5900-1",[],[],"2025-03-27T15:15:56.603Z","2026-04-28T20:29:35.630958Z",{"cisa_kev":26,"cisa_ransomware":26,"cisa_vendor":9,"epss_severity":9,"epss_score":9,"severity":9,"severity_score":9,"severity_version":9,"severity_source":9,"severity_vector":9,"severity_status":9},false,[28],{"url":29,"sources":30,"tags":32},"https://security-tracker.debian.org/tracker/CVE-2025-21887",[31],"osv_debian",[33],"Advisory",[],[],[37],{"source":31,"cvss_v2_0":9,"cvss_v3_0":9,"cvss_v3_1":38,"cvss_v4_0":9},{"baseScore":39,"baseSeverity":9,"vectorString":40,"impactScore":41,"exploitabilityScore":42},7.8,"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",9.8,4.6,[44,63],{"ecosystem":45,"name":46,"vendor":47,"product":46,"cpe_part":9,"purl_type":48,"purl_namespace":47,"purl_name":46,"source":9,"versions":49},"Debian","linux","debian","deb",[50,56,59,62],{"version":51,"is_range":52,"range_type":53,"version_start":9,"version_start_type":9,"version_end":54,"version_end_type":55,"fixed_in":9},"lt5_10_247_1",true,"ecosystem","5.10.247-1","excluding",{"version":57,"is_range":52,"range_type":53,"version_start":9,"version_start_type":9,"version_end":58,"version_end_type":55,"fixed_in":9},"lt6_1_133_1","6.1.133-1",{"version":60,"is_range":52,"range_type":53,"version_start":9,"version_start_type":9,"version_end":61,"version_end_type":55,"fixed_in":9},"lt6_12_19_1","6.12.19-1",{"version":60,"is_range":52,"range_type":53,"version_start":9,"version_start_type":9,"version_end":61,"version_end_type":55,"fixed_in":9},{"ecosystem":45,"name":64,"vendor":47,"product":64,"cpe_part":9,"purl_type":48,"purl_namespace":47,"purl_name":64,"source":9,"versions":65},"linux-6.1",[66],{"version":67,"is_range":52,"range_type":53,"version_start":9,"version_start_type":9,"version_end":68,"version_end_type":55,"fixed_in":9},"lt6_1_137_1~deb11u1","6.1.137-1~deb11u1"]