The (1) real_lookup and (2) __lookup_hash functions in fs/namei.c in the vfs implementation in the Linux kernel before 2.6.25.15 do not prevent creation of a child dentry for a deleted (aka S_DEAD) directory, which allows local users to cause a denial of service ("overflow" of the UBIFS orphan area) via a series of attempted file creations within deleted directories.
http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.25.15
http://lists.opensuse.org/opensuse-security-announce/2008-10/msg00001.html
http://lists.opensuse.org/opensuse-security-announce/2008-10/msg00003.html
http://lkml.org/lkml/2008/7/2/83
http://secunia.com/advisories/31551
http://secunia.com/advisories/31614
http://secunia.com/advisories/31836
http://secunia.com/advisories/31881
http://secunia.com/advisories/32023
http://secunia.com/advisories/32104
http://secunia.com/advisories/32190
http://secunia.com/advisories/32344
http://secunia.com/advisories/33201
http://secunia.com/advisories/33280
http://secunia.com/advisories/33556
http://www.debian.org/security/2008/dsa-1630
http://www.debian.org/security/2008/dsa-1636
http://www.mandriva.com/security/advisories?name=MDVSA-2008:220
http://www.redhat.com/support/errata/RHSA-2008-0787.html
http://www.redhat.com/support/errata/RHSA-2008-0857.html
http://www.redhat.com/support/errata/RHSA-2008-0885.html
http://www.redhat.com/support/errata/RHSA-2008-0973.html
http://www.redhat.com/support/errata/RHSA-2009-0014.html
http://www.securityfocus.com/bid/30647
http://www.securitytracker.com/id?1020739
http://www.vupen.com/english/advisories/2008/2430
https://bugzilla.redhat.com/show_bug.cgi?id=457858
https://exchange.xforce.ibmcloud.com/vulnerabilities/44410
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10744
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6551
Source: MITRE
Published: 2008-08-12
Updated: 2020-08-14
Type: CWE-120
Base Score: 4.9
Vector: AV:L/AC:L/Au:N/C:N/I:N/A:C
Impact Score: 6.9
Exploitability Score: 3.9
Severity: MEDIUM
Base Score: 5.5
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Impact Score: 3.6
Exploitability Score: 1.8
Severity: MEDIUM