tracing/probes: Fix use-after-free on field name/type of events with multiple probes
In the Linux kernel, the following vulnerability has been resolved: tracing/probes: Fix use-after-free on field name/type of events with multiple probes The fields of a probe-based dynamic event (kprobe, uprobe, eprobe and fprobe events) are created in traceprobe_define_arg_fields() by handing the probe_arg name/type strings to trace_define_field(), which only stores the pointers without copying. Those strings are owned by the trace_probe and are freed when that probe is removed. An event can have several probes attached. The field list is defined only once, by the first probe that registers the event, but it is kept alive by any surviving sibling probe. Deleting just that first probe by symbol - # primary A: fields are defined from A's args echo 'p:kprobes/ev vfs_read a1=$arg1' > kprobe_events # append B: shares A's event call echo 'p:kprobes/ev vfs_write a1=$arg1' >> kprobe_events # delete only A (matched by symbol), B survives echo '-:kprobes/ev vfs_read' >> kprobe_events frees A's args (trace_probe_cleanup() -> traceprobe_free_probe_arg()), but trace_probe_unlink() keeps the trace_probe_event because the probe list is not empty. The event call stays registered via B while its fields now reference freed memory. Any field lookup then reads it, e.g. echo 'a1 == 1' > events/kprobes/ev/filter BUG: KASAN: slab-use-after-free in strcmp+0xa7/0xb0 Call Trace: strcmp trace_find_event_field parse_pred process_preds create_filter apply_event_filter event_filter_write field->name refe
CVE-2026-98076
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-2026-98076
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": "ca89bc071d5e4e981dcc52e0ca90f4500d332e42",
"lessThan": "38305e1b8b1ec27eef8f2d4e461e3b6c8624d494",
"versionType": "git"
},
{
"status": "affected",
"version": "ca89bc071d5e4e981dcc52e0ca90f4500d332e42",
"lessThan": "6d6118c17bc791594cbfd9cc4936ee21073b894a",
"versionType": "git"
},
{
"status": "affected",
"version": "ca89bc071d5e4e981dcc52e0ca90f4500d332e42",
"lessThan": "a2510fcaad92b09b34574c97e8356234c6a84a9a",
"versionType": "git"
},
{
"status": "affected",
"version": "ca89bc071d5e4e981dcc52e0ca90f4500d332e42",
"lessThan": "9379e193826f23876daccb3351fab89c87084ba3",
"versionType": "git"
},
{
"status": "affected",
"version": "ca89bc071d5e4e981dcc52e0ca90f4500d332e42",
"lessThan": "68ae584169c7a41fc9bc4677c1d368983cf44b21",
"versionType": "git"
},
{
"status": "affected",
"version": "ca89bc071d5e4e981dcc52e0ca90f4500d332e42",
"lessThan": "411c9080a776577664531b4f7d3ee53b7a747ba8",
"versionType": "git"
},
{
"status": "affected",
"version": "ca89bc071d5e4e981dcc52e0ca90f4500d332e42",
"lessThan": "178ff2e011e21fbebdf57f5d58a408fe59136d82",
"versionType": "git"
},
{
"status": "affected",
"version": "ca89bc071d5e4e981dcc52e0ca90f4500d332e42",
"lessThan": "86b7a239ec6b14a7544200ede85474c6f5526049",
"versionType": "git"
}
],
"programFiles": [
"kernel/trace/trace_probe.c",
"kernel/trace/trace_probe.h"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.4"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.4",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.271",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.222",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.189",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"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_probe.c",
"kernel/trace/trace_probe.h"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98076
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38184 · Revision 1
- Added to Heist Feed
- Publisher date