In the Linux kernel, the following vulnerability has been resolved:
MIPS: ftrace: Fix memory corruption when kernel is located beyond 32 bits
Since commit e424054000878 ("MIPS: Tracing: Reduce the overhead of
dynamic Function Tracer"), the macro UASM_i_LA_mostly has been used,
and this macro can generate more than 2 instructions. At the same
time, the code in ftrace assumes that no more than 2 instructions can
be generated, which is why it stores them in an int[2] array. However,
as previously noted, the macro UASM_i_LA_mostly (and now UASM_i_LA)
causes a buffer overflow when _mcount is beyond 32 bits. This leads to
corruption of the variables located in the __read_mostly section.
This corruption was observed because the variable
__cpu_primary_thread_mask was corrupted, causing a hang very early
during boot.
This fix prevents the corruption by avoiding the generation of
instructions if they could exceed 2 instructions in
length. Fortunately, insn_la_mcount is only used if the instrumented
code is located outside the kernel code section, so dynamic ftrace can
still be used, albeit in a more limited scope. This is still
preferable to corrupting memory and/or crashing the kernel.
References
Configurations
Configuration 1 (hide)
|
History
25 Mar 2026, 19:32
| Type | Values Removed | Values Added |
|---|---|---|
| CWE | CWE-787 | |
| CPE | cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.19:rc8:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:2.6.35:-:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.19:rc7:*:*:*:*:*:* |
|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
| First Time |
Linux
Linux linux Kernel |
|
| References | () https://git.kernel.org/stable/c/36dac9a3dda1f2bae343191bc16b910c603cac25 - Patch | |
| References | () https://git.kernel.org/stable/c/7f39b9d0e86ed6236b9a5fb67616ab1f76c4f150 - Patch | |
| References | () https://git.kernel.org/stable/c/e3e33ac2eb69d595079a1a1e444c2fb98efdd42d - Patch |
14 Jan 2026, 15:15
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-01-14 15:15
Updated : 2026-03-25 19:32
NVD link : CVE-2025-71109
Mitre link : CVE-2025-71109
CVE.ORG link : CVE-2025-71109
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-787
Out-of-bounds Write