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The vulnerability (CVE-2025-59610) resides in the Qualcomm MSM (Mobile Station Modem) driver’s IOCTL (Input/Output Control) handler. When a user-space application issues an IOCTL request to the driver, it typically includes an API version number to ensure compatibility between user and kernel components. In vulnerable versions, the driver does not properly validate this API version before processing the request. An attacker can craft an IOCTL call with a mismatched or deliberately malformed API version, triggering a code path where the driver attempts to read or write a user-space buffer that is simultaneously being modified by another thread.
The core issue is a race condition: while the driver kernel thread is copying data from the user-supplied buffer, a second user-space thread modifies the same buffer’s content, length, or metadata. Because the driver lacks proper locking or validation for concurrent access, it may dereference stale pointers or calculate incorrect buffer boundaries. This leads to memory corruption—specifically, an out‑of‑bounds write or a use‑after‑free condition. An attacker can exploit this to overwrite critical kernel structures (e.g., function pointers, reference counters) and achieve arbitrary code execution with kernel privileges. The vulnerability is reachable via standard device file handles (e.g., /dev/msm_) without special privileges on many Android and embedded Linux systems using Qualcomm chipsets. The attack complexity is moderate, requiring the ability to run unprivileged code and precise timing to win the race. Successful exploitation completely compromises the device, allowing persistent rootkits, data exfiltration, or denial of service.
DailyCVE Form:
Platform: Qualcomm MSM driver
Version: Various Snapdragon builds
Vulnerability: Race‑condition memory corruption
Severity: Critical
date: 2026-06-01
Prediction: 2026-06-22 (expected)
What Undercode Say:
Check API version mismatches in IOCTL logs dmesg | grep -i "ioctl.version mismatch" List vulnerable IOCTL codes (example for msm_sdio driver) grep -r "0x4008" /proc/config.gz | zcat Extract driver version modinfo msm_sdio | grep version Monitor concurrent buffer modifications strace -e ioctl -p $(pidof vulnerable_app) 2>&1 | grep "API_VER"
// Pseudo-code: Trigger race condition
int trigger_race(int fd, char user_buf, size_t len) {
pthread_t t1, t2;
pthread_create(&t1, NULL, ioctl_writer, (void)&fd);
pthread_create(&t2, NULL, buffer_modifier, (void)user_buf);
pthread_join(t1, NULL);
pthread_join(t2, NULL);
return 0;
}
Exploit:
1. Open target device node (e.g., `/dev/msm_ipc`).
- Spawn two threads: one repeatedly issues `IOCTL_CMD` with mismatched API version; the other continuously modifies the user‑space buffer (changing size or overwriting with garbage).
- Use `futex` or `nanosleep` to align window where kernel reads buffer length while second thread updates it.
- Trigger out‑of‑bounds write to overwrite `modprobe_path` or `core_pattern` for privilege escalation.
Protection:
- Apply Qualcomm patch (ID QCSEC-2026-003) updating IOCTL validation and adding `copy_from_user` with `access_ok` checks.
- Enable `CONFIG_SLUB_DEBUG` and `CONFIG_DEBUG_PAGEALLOC` to detect corruption early.
- Restrict unprivileged access to `/dev/msm_` via SELinux policy.
- Use IOMMU to isolate user buffers from kernel address space.
Impact:
- Full kernel compromise (privilege escalation to root).
- Bypass of Android SELinux and verified boot.
- Permanent denial of service (kernel panic).
- Remote code execution if combined with a vector to deliver IOCTL calls (e.g., malicious app or web‑based driver interaction).
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Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
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