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...

The vulnerability of the `ovl_verify_area()` function in the `fs/overlayfs/copy_up.c` component of the Linux kernel allows a hacker to trigger a service failure.

The vulnerability of the ovlverifyarea function in the fs/overlayfs/copyup.c component of the Linux kernel is related to the insufficient use of the assert function. Exploiting this vulnerability could allow an attacker to cause a system failure...

The vulnerability of the vfs_getattr() function in the overlayfs component of the Linux operating system allows a hacker to cause a service failure.

The vulnerability of the vfsgetattr function in the overlayfs component of the Linux operating system is related to pointer arithmetic errors. Exploiting this vulnerability can allow an attacker to cause a service failure...

VulnCheck KEV: CVE-2023-0386

Linux Kernel contains an improper ownership management vulnerability, where unauthorized access to the execution of the setuid file with capabilities was found in the Linux kernel’s OverlayFS subsystem in how a user copies a capable file from a nosuid mount into another mount. This uid mapping...

Linux Kernel Improper Ownership Management Vulnerability

Linux Kernel contains an improper ownership management vulnerability, where unauthorized access to the execution of the setuid file with capabilities was found in the Linux kernel’s OverlayFS subsystem in how a user copies a capable file from a nosuid mount into another mount. This uid mapping bu...

TencentOS Server 2: kernel (TSSA-2024:0144)

The version of Tencent Linux installed on the remote TencentOS Server 2 host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the TSSA-2024:0144 advisory. Package updates are available for TencentOS Server 2 that fix the following vulnerabilities...

UBUNTU-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...

CVE-2025-37863

CVE-2025-37863 affects the Linux kernel overlayfs (ovl). The issue arises when a data-only layer is pointed to by an upper layer, something not currently used but previously allowed only via the datadir+ feature, which could trigger an Oops. The documented fix disables datadir without a lowerdir,...

CVE-2025-37863 ovl: don't allow datadir only

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...

CVE-2025-37863 ovl: don't allow datadir only

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...

Linux kernel 安全漏洞

Linux kernel is the kernel used by Linux, the open source operating system of the Linux Foundation in the United States. A security vulnerability exists in the Linux kernel that stems from overlayfs not handling pure data directories correctly, which could cause the kernel to crash...

Important: kernel

Issue Overview: A race condition accessing file object in the Linux kernel OverlayFS subsystem was found in the way users do rename in specific way with OverlayFS. A local user could use this flaw to crash the system. CVE-2021-20321 A flaw was found in the Linux kernel. A memory leak in the ccp-o...

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...

SUSE 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-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...

AZL-59405 CVE-2025-21887 affecting package kernel for versions less than 5.15.180.1-1

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 CVE-2025-21887, the Linux kernel overlayfs (ovl) had a use-after-free in ovl_dentry_remote/ovl_dentry_update_reval caused by calling dput(upper) before upper is no longer safe to use; the fix moves dput(upper) to after its final use in ovl_link_up, preventing the UAF. The issue is addressed in...

Linux kernel 安全漏洞

Linux kernel is the kernel used by Linux, the open source operating system of the Linux Foundation in the United States. A security vulnerability exists in the Linux kernel that stems from overlayfs not properly handling tmpfile cleanup...

GHSA-265R-HFXG-FHMG vulnerabilities

Vulnerabilities for packages: ctop, docker-cli-buildx, cilium-cli, flux-helm-controller, neuvector-scanner, osv-scanner, kargo, cluster-api-helm-controller, envoy-gateway, k3s, melange, newrelic-infrastructure-agent, eksctl, kubevela, skaffold, helm-push, docker-compose, helm, grype,...

fuse-overlayfs bug fix and enhancement update

An update is available for fuse-overlayfs. This update affects Rocky Linux 9. A Common Vulnerability Scoring System CVSS base score, which gives a detailed severity rating, is available for each vulnerability from the CVE list For detailed information on changes in this release, see the Rocky Lin...