CVE-2026-63808

CVE-2026-63808 (Linux kernel exFAT): The vulnerability is a potential use-after-free in exfat_find_dir_entry() where a buffer_head is freed before all reads on the TYPE_EXTEND path, leading to a read from invalid memory. The root cause is brelse(bh) occurring before ep is no longer dereferenced; ...

CVE-2026-63808

In the Linux kernel, the following vulnerability has been resolved: exfat: fix potential use-after-free in exfatfinddirentry In exfatfinddirentry, the bufferhead obtained from exfatgetdentry is released with brelsebh before the fall-through TYPEEXTEND branch reads the directory entry through ep...

CVE-2026-63808 exfat: fix potential use-after-free in exfat_find_dir_entry()

In the Linux kernel, the following vulnerability has been resolved: exfat: fix potential use-after-free in exfatfinddirentry In exfatfinddirentry, the bufferhead obtained from exfatgetdentry is released with brelsebh before the fall-through TYPEEXTEND branch reads the directory entry through ep...

PT-2026-61124

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description A use-after-free issue exists in the exfat find dir entry function. The problem occurs when a buffer head obtained from exfat get dentry is released using brelsebh before the TYPE EXTEND...

Linux Distros Unpatched Vulnerability : CVE-2026-63808

"The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - exfat: fix potential use-after-free in exfatfinddirentry In exfatfinddirentry, the bufferhead obtained from exfatgetdentry is released with brelsebh before the...

CVE-2026-6687

FatFs R0.16 and earlier contains a stack overflow bug in fgetlabel because exFAT label length XDIRNumLabel is trusted without enforcing spec maximums. This maps to CWE-121 Stack-based Buffer Overflow. Estimated CVSS v3.1 vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H 7.6, High. The estimate...

CVE-2026-6683

FatFs R0.16 and earlier contains a divide-by-zero in exFAT sync logic bug when crafted metadata causes nfatent - 2 to be zero during write/sync operations. This maps to CWE-369 Divide By Zero. Estimated CVSS v3.1 vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H 4.6, Medium. Network-delivered...

EUVD-2026-40999

FatFs R0.16 and earlier contains a stack overflow bug in fgetlabel because exFAT label length XDIRNumLabel is trusted without enforcing spec maximums. This maps to CWE-121 Stack-based Buffer Overflow. Estimated CVSS v3.1 vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H 7.6, High. The estimate...

CVE-2026-6687

FatFs R0.16 and earlier contains a stack overflow bug in fgetlabel because exFAT label length XDIRNumLabel is trusted without enforcing spec maximums. This maps to CWE-121 Stack-based Buffer Overflow. Estimated CVSS v3.1 vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H 7.6, High. The estimate...

CVE-2026-6687

CVE-2026-6687 affects FatFs R0.16 and earlier. Root cause: f_getlabel() trusts exFAT label length (XDIR_NumLabel) beyond the spec maximums, causing a stack-based buffer overflow (CWE-121). Documented impact per CVSS: high for confidentiality, integrity, and availability. Exploitation status is no...

EUVD-2026-40993

FatFs R0.16 and earlier contains a divide-by-zero in exFAT sync logic bug when crafted metadata causes nfatent - 2 to be zero during write/sync operations. This maps to CWE-369 Divide By Zero. Estimated CVSS v3.1 vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H 4.6, Medium. Network-delivered...

CVE-2026-6683

CVE-2026-6683 describes a divide-by-zero in FatFs exFAT sync for FatFs R0.16 and earlier. The bug arises when crafted metadata causes the expression n_fatent - 2 to be zero during write/sync, mapping to CWE-369 (Divide By Zero). The vulnerability is applicable to FatFs versions ending at R0.16 an...

PT-2026-54929

Name of the Vulnerable Software and Affected Versions FatFs versions R0.16 and earlier Description A stack-based buffer overflow occurs in the f getlabel function. This issue arises because the exFAT label length XDIR NumLabel is trusted without enforcing the maximum limits defined by the...

PT-2026-54925

Name of the Vulnerable Software and Affected Versions FatFs versions R0.16 and earlier Description A divide-by-zero issue exists in the exFAT sync logic. This occurs during write or sync operations when crafted metadata causes the calculation n fatent - 2 to result in zero. Divide-by-zero is a...

Important: kernel

Issue Overview: In the Linux kernel, the following vulnerability has been resolved: i40e: remove read access to debugfs files CVE-2025-39901 In the Linux kernel, the following vulnerability has been resolved: exfat: validate cluster allocation bits of the allocation bitmap CVE-2025-40307 In the...

Amazon Linux 2023 : bpftool, kernel, kernel-devel (ALAS2023-2026-1817)

It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2023-2026-1817 advisory. In the Linux kernel, the following vulnerability has been resolved: i40e: remove read access to debugfs files CVE-2025-39901 In the Linux kernel, the following vulnerability has been resolved:...

YKWriter

YKWriter 🔑💾 YKWriter is a lightweight Windows Forms utili...

USN-8296-2: Linux kernel (NVIDIA Tegra) 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; - x86 architecture; - Compute Acceleration Framework; - Drivers core; - Null block device drive...

Ubuntu 24.04 LTS : Linux kernel (FIPS) vulnerabilities (USN-8296-1)

The remote Ubuntu 24.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-8296-1 advisory. Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in...

Astra Linux – Vulnerability found in Linux 5.10, Linux 6.1, and Linux 5.15

In the Linux kernel, the following vulnerability has been resolved: exfat: fixed a potential deadlock in exfatgetdentryset When accessing a file with more entries than ESMAXENTRYNUM, the bh-array is allocated in exfatgetdentryset. The problem is that the bh-array is allocated using GFPKERNEL. Thi...