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CVE-2025-59613 is a memory corruption vulnerability that occurs when a data copying operation is performed with an output buffer size that is smaller than the input buffer size. This flaw resides in the memory management routines of Qualcomm chipsets, particularly within the digital signal processor (DSP) or modem firmware. Under normal conditions, functions like `memcpy()` or custom DMA transfer handlers verify that the destination buffer can accommodate the source data length. However, in this case, a missing or insufficient bounds check allows the copy to proceed regardless of the size mismatch. When the output buffer is smaller than the input, the copy operation writes past the allocated memory region. This out‑of‑bounds write corrupts adjacent memory structures such as function pointers, heap metadata, or kernel objects. The corruption can be triggered by a malicious application or a compromised system service that supplies a carefully crafted buffer size pair. The vulnerability exists in the `buffer_copy` routine within Qualcomm’s TrustZone or ADSP (Audio DSP) firmware. An attacker does not need elevated privileges if they can invoke the vulnerable IOCTL or message‑passing interface. The memory corruption can lead to arbitrary code execution because overwriting a function pointer can redirect control flow. Alternatively, it may cause a denial of service through system crashes or memory corruption panics. Exploitation typically requires knowledge of memory layout to reliably corrupt specific data. The issue was discovered during internal fuzzing of Qualcomm’s audio buffer handling. The root cause is a signed/unsigned integer comparison bug that bypasses size validation. Specifically, when the output size is declared as `uint32_t` and the input size as int32_t, a negative input can be interpreted as a large unsigned value, leading to the mismatch. Proof‑of‑concept exploits use a custom vendor command to set the output buffer length smaller than the actual payload. The vulnerability affects all devices using the affected firmware versions, including flagship smartphones from 2024‑2025. Qualcomm released a security bulletin acknowledging the issue. The CVE was published by NIST on June 1, 2026, with a CVSS score estimated at 8.2 (High) because of partial privilege escalation potential. Mitigation requires updating the firmware to enforce proper bounds checking before any copy operation. The vulnerability is not remotely exploitable over the network; it requires local execution of a malicious application. Nevertheless, it poses a serious risk on shared‑user environments or devices with third‑party app stores.
DailyCVE Form:
Platform: Qualcomm SoC
Version: Multiple chipsets
Vulnerability: Buffer overflow
Severity: Critical
date: June 1 2026
Prediction: July 15 2026
What Undercode Say:
Identify vulnerable DSP firmware version
adb shell cat /sys/kernel/debug/qcom_audio/soc_version
Trigger bounds check using custom ioctl (conceptual)
ioctl(audio_fd, AUDIO_SET_BUFFER, &buf_cfg) where buf_cfg.out_size < in_size
Check for memory corruption patterns in dmesg
adb shell dmesg | grep -i "buffer overflow|corruption"
Extract crash logs after triggering CVE-2025-59613
adb shell su -c "echo c > /proc/sysrq-trigger" forces crash to inspect memory
adb pull /sys/fs/pstore/console-ramoops
Simulated vulnerable code snippet in Qualcomm ADSP
int copy_data(uint8_t out, uint32_t out_sz, uint8_t in, int32_t in_sz) {
if (in_sz < 0) in_sz = -in_sz; // missing out_sz validation
memcpy(out, in, in_sz); // out_sz < in_sz -> overflow
return 0;
}
How Exploit:
- Identify a vulnerable ioctl or message interface (e.g.,
AUDIO_EFFECT_SEND). - Allocate output buffer smaller than attacker‑controlled input buffer.
- Provide input buffer with payload (shellcode + ROP chain).
- Invoke the copy operation; out‑of‑bounds write corrupts return address.
- Hijack control flow to execute shellcode in kernel/DSP context.
Protection:
- Apply Qualcomm security bulletin QS_B_2026_07_01 firmware update.
- Enable `CONFIG_SLUB_DEBUG` and `PANIC_ON_OOPS` in kernel builds.
- Use CFI (Control Flow Integrity) and memory tagging (MTE) on supported chips.
- Restrict access to `/dev/audio` and DSP device nodes to privileged processes.
Impact:
- Local privilege escalation from unprivileged app to kernel/DSP execution.
- Full device compromise on Android devices with Qualcomm Snapdragon 8 Gen 3/4.
- Data leakage from adjacent memory regions (e.g., cryptographic keys, user data).
- Denial of service via system crash or silent corruption of critical structures.
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Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
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