CVE-2026-97934
UnknownSummary
A vulnerability in the Linux kernel tracing subsystem allows memory corruption via a "STACKTRACE" histogram key. The field is passed as non-NULL to create_hist_field(), causing an untrusted offset and length to be read and an unbounded memcpy to occur. This can result in a general protection fault and kernel panic.
Risk Assessment
A local attacker able to write to tracefs files can trigger kernel memory corruption and a system panic, leading to denial of service.
Recommendation
Update the Linux kernel to a version containing the fix that leaves the field NULL. Restrict access to tracefs/ftrace interfaces for unprivileged users.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: tracing: Fix memory corruption from a "STACKTRACE" histogram key "cpu", "CPU", "stacktrace" and "STACKTRACE" are generic fields, defined with an offset and a size of zero so that the filter code can match them by name. parse_field() maps them onto their common_* equivalents for backward compatibility, but unlike the common_* names it hands the placeholder back to the caller instead of NULL. create_hist_field() takes a non-NULL field as a promise that the record carries a stacktrace and picks HIST_FIELD_FN_STACK, so the __data_loc word is read from offset 0, that is from common_type, and its low 16 bits are followed as an offset into the record. What is found there becomes the length of an unbounded memcpy. Pick an event whose id is small enough that the offset stays inside its own record and the length is a kernel text address: # cd /sys/kernel/tracing # echo 'hist:keys=STACKTRACE' > events/ftrace/print/trigger # echo hello > trace_marker Oops: general protection fault, probably for non-canonical address RIP: 0010:rb_next+0x23/0x60 </IRQ> RIP: 0010:memcpy+0xc/0x30 event_hist_trigger+0x2e7/0x12c0 Kernel panic - not syncing: Fatal exception in interrupt Leave the field NULL, which is what the comment above the branch says the code does and what common_stacktrace already does. FILTER_CPU and FILTER_COMM are left alone, their create_hist_field() branches never look at the field.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS