kernel: ovl: fix UAF in ovl_dentry_update_reval by moving dput() in ovl_link_up

A use after free vulnerability exists in the linux kernel such that dputupper is being called before ovldentryupdatereval, while upper-dflags was still accessed in ovldentryremote...

Exploit for Privilege Context Switching Error in Canonical Ubuntu_Linux

PoC exploit for CVE-2021-3493, an Ubuntu OverlayFS Local Privesc vulnerability. The target is the Linux kernel, specifically the overlayfs file system, which did not properly validate the application of file system capabilities with respect to user namespaces. A local attacker could use this to...

USN-7510-6 linux-aws-fips vulnerabilities

Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in the following subsystems: - ARM64 architecture; - PowerPC architecture; - x86 architecture; - Block layer subsystem; - Network block device...

kernel: Linux kernel OverlayFS: Kernel crash via null pointer dereference in ovl_get_acl_rcu()

A flaw was found in the OverlayFS ovl component of the Linux kernel. A local user can trigger a null pointer dereference by performing a specific sequence of file system operations. This vulnerability occurs when the ovlgetaclrcu function attempts to access a real inode that has been set to NULL...

kernel: ovl: fix null pointer dereference in ovl_permission()

In the Linux kernel, the following vulnerability has been resolved: ovl: fix null pointer dereference in ovlpermission Following process: P1 P2 pathlookupat linkpathwalk inodepermission ovlpermission ovlipathrealinode, &realpath path-dentry = ovlidentryupperinode dropcache dentrykillovldentry...

kernel: ovl: Filter invalid inodes with missing lookup function

In the Linux kernel, the following vulnerability has been resolved: ovl: Filter invalid inodes with missing lookup function Add a check to the ovldentryweird function to prevent the processing of directory inodes that lack the lookup function. This is important because such inodes can cause error...

DEBIAN-CVE-2025-37863

In the Linux kernel, the following vulnerability has been resolved: ovl: don't allow datadir only In theory overlayfs could support upper layer directly referring to a data layer, but there's no current use case for this. Originally, when data-only layers were introduced, this wasn't allowed, onl...

The vulnerability of the ovl component in the Linux operating system’s kernel allows a hacker to trigger a service failure.

The vulnerability of the ovl component in the Linux operating system’s kernel is related to improper validation of input data. Exploiting this vulnerability can allow an attacker to cause a service failure...

ovl: fix UAF in ovl_dentry_update_reval by moving dput() in ovl_link_up

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SUSE CVE-2025-21887

In the Linux kernel, the following vulnerability has been resolved: ovl: fix UAF in ovldentryupdatereval by moving dput in ovllinkup The issue was caused by dputupper being called before ovldentryupdatereval, while upper-dflags was still accessed in ovldentryremote. Move dputupper after its last...

DEBIAN-CVE-2023-53004

In the Linux kernel, the following vulnerability has been resolved: ovl: fix tmpfile leak Missed an error cleanup...

UBUNTU-CVE-2023-53004

In the Linux kernel, the following vulnerability has been resolved: ovl: fix tmpfile leak Missed an error cleanup...

UBUNTU-CVE-2022-49743

In the Linux kernel, the following vulnerability has been resolved: ovl: Use "buf" flexible array for memcpy destination The "buf" flexible array needs to be the memcpy destination to avoid false positive run-time warning from the recent FORTIFYSOURCE hardening: memcpy: detected field-spanning...

CVE-2022-49743

In the Linux kernel, the following vulnerability has been resolved: ovl: Use "buf" flexible array for memcpy destination The "buf" flexible array needs to be the memcpy destination to avoid false positive run-time warning from the recent FORTIFYSOURCE hardening: memcpy: detected field-spanning...

CVE-2022-49743 ovl: Use "buf" flexible array for memcpy() destination

In the Linux kernel, the following vulnerability has been resolved: ovl: Use "buf" flexible array for memcpy destination The "buf" flexible array needs to be the memcpy destination to avoid false positive run-time warning from the recent FORTIFYSOURCE hardening: memcpy: detected field-spanning...

CVE-2022-49743

In the Linux kernel, the following vulnerability has been resolved: ovl: Use "buf" flexible array for memcpy destination The "buf" flexible array needs to be the memcpy destination to avoid false positive run-time warning from the recent FORTIFYSOURCE hardening: memcpy: detected field-spanning...

DEBIAN-CVE-2025-21887

In the Linux kernel, the following vulnerability has been resolved: ovl: fix UAF in ovldentryupdatereval by moving dput in ovllinkup The issue was caused by dputupper being called before ovldentryupdatereval, while upper-dflags was still accessed in ovldentryremote. Move dputupper after its last...

CVE-2025-21887

In the Linux kernel, the following vulnerability has been resolved: ovl: fix UAF in ovldentryupdatereval by moving dput in ovllinkup The issue was caused by dputupper being called before ovldentryupdatereval, while upper-dflags was still accessed in ovldentryremote. Move dputupper after its last...

UBUNTU-CVE-2025-21887

In the Linux kernel, the following vulnerability has been resolved: ovl: fix UAF in ovldentryupdatereval by moving dput in ovllinkup The issue was caused by dputupper being called before ovldentryupdatereval, while upper-dflags was still accessed in ovldentryremote. Move dputupper after its last...

CVE-2025-21887 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 ovldentryupdatereval by moving dput in ovllinkup The issue was caused by dputupper being called before ovldentryupdatereval, while upper-dflags was still accessed in ovldentryremote. Move dputupper after its last...