Security vulnerabilities and automated fixes for linux kernel issues
6 posts found
A critical buffer overflow vulnerability was discovered in the Linux kernel's Kconfig build system where `strcpy()` copied user-controlled symbol values into a fixed-size buffer without bounds checking. This flaw in `scripts/kconfig/symbol.c` could allow attackers to overwrite adjacent memory when processing malicious Kconfig files. The fix replaces the unsafe `strcpy()` with `memcpy()` using explicit length calculations.
A series of unsafe `sprintf()` calls in the Qualcomm USB network kernel driver (`qcom_usbnet_main.c`) created buffer overflow conditions that, when combined with other memory corruption primitives in the same file, could allow an attacker with physical USB access to escalate privileges to root. The fix replaces unbounded `sprintf()` and `snprintf()` misuse with properly bounded `snprintf()` and `scnprintf()` calls that respect actual buffer sizes. This is a textbook example of how a seemingly mi
A heap buffer overflow vulnerability was discovered in `scripts/kconfig/symbol.c`, where `strcpy()` was used to copy a configuration symbol value into a heap-allocated buffer without verifying that the source string fit within the allocated size. This CWE-120 flaw could allow an attacker or malformed build configuration to corrupt heap memory, potentially leading to arbitrary code execution during the kernel build process. The fix replaces `strcpy()` with a bounds-aware `memcpy()` and replaces u
A high-severity out-of-bounds access vulnerability was discovered and patched in the `py32ioexp` Linux GPIO expander driver. The `py32io_gpio_direction_input()` function failed to validate a user-supplied pin offset against the chip's declared GPIO count, opening the door to memory corruption via the GPIO character device interface. A two-line bounds check now closes the vulnerability cleanly and efficiently.
A critical buffer overflow vulnerability (CWE-120) was discovered and patched in `module/x86/bpf_x86_native_lab.c`, where a bounds check on BPF blob length was only performed inside an `emit` conditional branch — leaving a window for kernel memory corruption when `emit` was false. The fix relocates the length validation before any branching logic, ensuring no code path can proceed with an oversized blob. This type of kernel-level vulnerability is particularly dangerous because successful exploit
A critical memory safety vulnerability was discovered and fixed in the Linux kernel's SSDFS filesystem driver, where directly assigning the return value of krealloc() to the original pointer could cause use-after-free conditions or NULL pointer dereferences when memory allocation fails. This well-known dangerous pattern, explicitly warned against in Linux kernel coding guidelines, could allow attackers to trigger memory corruption under low-memory conditions. The fix implements the safe temporar