ftrace: Take trace_array reference before accessing its ftrace_ops
In the Linux kernel, the following vulnerability has been resolved: ftrace: Take trace_array reference before accessing its ftrace_ops The trace instance files set_ftrace_filter and set_ftrace_notrace was updated to work with specific trace instances (trace_arrays). The issue is that when these files are opened, there is a small race window where it will use the ftrace_ops from the inode->private pointer to get a reference to the trace_array and then take its reference. The problem is that the ftrace_ops itself could be freed. If the rmdir on the instance happens at the same time the set_ftrace_filter file is opened, the rmdir could have also freed the ftrace_ops and referencing it will cause a use-after-free bug and crash the kernel. Instead, pass in the trace_array as the file private data (NULL for the top level instance), and then pass both the trace_array and the ftrace_ops to the ftrace_regex_open() function. If the trace_array is NULL, then it just uses the ftrace_ops without the need to take its reference (like normal). If the ftrace_ops is NULL, that is only the case for the top level instance and the global_ops can be used. This allows the trace_array to have its reference incremented before touching the ftrace_ops that could also be freed when the instance is.
CVE-2026-90002
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-2026-90002
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": "591dffdade9f07692a7dd3ed16830ec24e901ece",
"lessThan": "29266da8ee1d9be656b1f22460c49538e1930658",
"versionType": "git"
},
{
"status": "affected",
"version": "591dffdade9f07692a7dd3ed16830ec24e901ece",
"lessThan": "177cd8966325f0ffffa3c9381f9e0422019a3973",
"versionType": "git"
},
{
"status": "affected",
"version": "591dffdade9f07692a7dd3ed16830ec24e901ece",
"lessThan": "83fd7eca5ab0d3ac3f23bff889175d847e21af06",
"versionType": "git"
},
{
"status": "affected",
"version": "591dffdade9f07692a7dd3ed16830ec24e901ece",
"lessThan": "cee8f286794df916553d8d445eac5c323ec5b0f8",
"versionType": "git"
},
{
"status": "affected",
"version": "591dffdade9f07692a7dd3ed16830ec24e901ece",
"lessThan": "9100191e5acb2e5ea2313f436667bb5fce129f47",
"versionType": "git"
}
],
"programFiles": [
"include/linux/ftrace.h",
"kernel/trace/ftrace.c",
"kernel/trace/trace.h",
"kernel/trace/trace_functions.c",
"kernel/trace/trace_stack.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.15"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.15",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.112",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.5",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"include/linux/ftrace.h",
"kernel/trace/ftrace.c",
"kernel/trace/trace.h",
"kernel/trace/trace_functions.c",
"kernel/trace/trace_stack.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-90002
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #48578 · Revision 1
- Added to Heist Feed
- Publisher date