tracing: Fix memory corruption from the histogram stacktrace modifier
In the Linux kernel, the following vulnerability has been resolved: tracing: Fix memory corruption from the histogram stacktrace modifier parse_field() sets HIST_FIELD_FL_STACKTRACE from the ".stacktrace" modifier before it looks the field name up, and nothing afterwards checks that the name resolved to a field which holds a stacktrace. create_hist_field() picks HIST_FIELD_FN_STACK on the strength of the field pointer alone, which reads a __data_loc word from the record and follows its low 16 bits as an offset into the same record. event_hist_trigger() takes the first word there as an entry count and copies that many longs into a 31 entry array: n_entries = *stack; memcpy(entries, ++stack, n_entries * sizeof(unsigned long)); Neither end of that copy is bounded, and the count is whatever the event holds at the offset, so any field will do: # cd /sys/kernel/tracing/events/sched/sched_process_fork # echo 'hist:keys=parent_pid.stacktrace' > trigger # (true) BUG: kernel NULL pointer dereference, address: 0000000000000008 RIP: 0010:rb_insert_color+0x18/0x130 timerqueue_linked_add+0x7e/0xd0 enqueue_hrtimer+0x39/0xb0 __hrtimer_run_queues+0x10f/0x1f0 RIP: 0010:memcpy+0xc/0x30 event_hist_trigger+0x165/0x690 The timer interrupt landed on the rbtree the copy had already run over. No debug options are needed for this; KASAN reports the same write as an out-of-bounds read of 13835058055416381440 bytes. Documentation/trace/histogram.rst already states the rule, "must be a long[] type", so e
CVE-2026-97936
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-97936
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "cc5fc8bfc961eeb99b7e8dffbeff7a3f6995d314",
"lessThan": "98da3379cdee343f671dac89b9afbd8b071f2591",
"versionType": "git"
},
{
"status": "affected",
"version": "cc5fc8bfc961eeb99b7e8dffbeff7a3f6995d314",
"lessThan": "e183b84968d4a6ea476d806ea97668405aa56880",
"versionType": "git"
},
{
"status": "affected",
"version": "cc5fc8bfc961eeb99b7e8dffbeff7a3f6995d314",
"lessThan": "57bfc2a17954d173d2a4182f3b582ffbb23aff64",
"versionType": "git"
},
{
"status": "affected",
"version": "cc5fc8bfc961eeb99b7e8dffbeff7a3f6995d314",
"lessThan": "55caaf25da2c2bb9b75307e4c868726cb954b1d6",
"versionType": "git"
},
{
"status": "affected",
"version": "cc5fc8bfc961eeb99b7e8dffbeff7a3f6995d314",
"lessThan": "a5e70ba87ca8ebc79b4e63de302d03b0625fe153",
"versionType": "git"
}
],
"programFiles": [
"kernel/trace/trace_events_hist.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.3"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.3",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.158",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.111",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.53",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.7",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"kernel/trace/trace_events_hist.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-97936
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38081 · Revision 1
- Added to Heist Feed
- Publisher date