tracing: Keep the entry count when the histogram stats allocation fails
In the Linux kernel, the following vulnerability has been resolved: tracing: Keep the entry count when the histogram stats allocation fails print_entries() uses n_entries both as the number of sort entries and as its own return value, so the -ENOMEM it stores when the stats allocation fails overwrites the count that the cleanup still needs: n_entries = tracing_map_sort_entries(map, ...); if (n_entries < 0) return n_entries; ... if (!stats) { n_entries = -ENOMEM; goto out; } ... out: tracing_map_destroy_sort_entries(sort_entries, n_entries); tracing_map_destroy_sort_entries() takes an unsigned int and loops up to it, so -ENOMEM arrives as 4294967284. It walks an array of at most map->max_elts pointers and calls destroy_sort_entry(), which dereferences and frees, on whatever lies past the end. Reading the hist file of a trigger with a .percent value, with that allocation forced to fail: BUG: KASAN: vmalloc-out-of-bounds in tracing_map_destroy_sort_entries+0xa0/0xb0 Read of size 8 at addr ffffc90000045000 by task init/1 tracing_map_destroy_sort_entries+0xa0/0xb0 hist_show+0x6f7/0x1df0 seq_read_iter+0x2b8/0x1190 vfs_read+0x176/0xa40 The buggy address belongs to a 4-page vmalloc region starting at ffffc90000041000 allocated at tracing_map_sort_entries+0x5c/0xd50 A few pages further the fault is fatal. The registers at the oops confirm the bound: the loop's end pointer less the array start, over the pointer size, is 4294967284. Return the error in a separate variable and leave n_en
CVE-2026-97920
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-2026-97920
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": "93454d1a306ea975294b861d32ffa1e44b20c733",
"lessThan": "89c978d67ad01ce28223944cc58e95feea177b35",
"versionType": "git"
},
{
"status": "affected",
"version": "abaa5258ce5e5887a9de049f50a85dc023391a1c",
"lessThan": "fe05eeed27128e17d38dbc0af02e4470bcecda89",
"versionType": "git"
},
{
"status": "affected",
"version": "abaa5258ce5e5887a9de049f50a85dc023391a1c",
"lessThan": "9bd8321f5370295d1ae96dd17d43be3c9edd441b",
"versionType": "git"
},
{
"status": "affected",
"version": "abaa5258ce5e5887a9de049f50a85dc023391a1c",
"lessThan": "c80b2a8067d58ff7d268ceef781c68b37a16c321",
"versionType": "git"
},
{
"status": "affected",
"version": "abaa5258ce5e5887a9de049f50a85dc023391a1c",
"lessThan": "17e87ce55f877efff1b08fe509e8bf91378cbbc9",
"versionType": "git"
},
{
"status": "affected",
"version": "abaa5258ce5e5887a9de049f50a85dc023391a1c",
"lessThan": "06f5634ec5584954177f9a22e36b3bfb398a971b",
"versionType": "git"
},
{
"status": "affected",
"version": "6.1.23",
"lessThan": "6.1.189",
"versionType": "semver"
}
],
"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": "6.2"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.2",
"versionType": "semver"
},
{
"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_events_hist.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-97920
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #38070 · Revision 1
- Added to Heist Feed
- Publisher date