perf: Require kernel access for text poke events
In the Linux kernel, the following vulnerability has been resolved: perf: Require kernel access for text poke events Perf events with exclude_kernel=1 can be opened without kernel perf access. However, exclude_kernel does not suppress text-poke sideband records. Every PERF_RECORD_TEXT_POKE is marked PERF_RECORD_MISC_KERNEL and contains a raw kernel instruction address. An unprivileged task can therefore open and mmap a task-local software event with text_poke=1. Both opening a count-only tracepoint event and configuring UDP GRO for ESP-in-UDP cause updates to inline static calls; the observer receives the relocated addresses of the modified instructions. For a known kernel image, any such address reveals the runtime kernel text base despite KASLR. Call perf_allow_kernel() whenever attr.text_poke is set, regardless of exclude_kernel. Events that neither monitor kernel execution nor request text-poke records retain their existing permissions.
CVE-2026-98655
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-2026-98655
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": "e17d43b93e544f5016c0251d2074c15568d5d963",
"lessThan": "8c38cb055f6a9651198780e4e4d5283de4039f79",
"versionType": "git"
},
{
"status": "affected",
"version": "e17d43b93e544f5016c0251d2074c15568d5d963",
"lessThan": "8473f44db9f710ea6f8cafb22f2e3ba6cb8ca9a7",
"versionType": "git"
},
{
"status": "affected",
"version": "e17d43b93e544f5016c0251d2074c15568d5d963",
"lessThan": "e506333d1b9f42f1e402acebf1283af3c44a3809",
"versionType": "git"
},
{
"status": "affected",
"version": "e17d43b93e544f5016c0251d2074c15568d5d963",
"lessThan": "677d0b51ac1a0db55d768c4c6399210b3de0795b",
"versionType": "git"
},
{
"status": "affected",
"version": "e17d43b93e544f5016c0251d2074c15568d5d963",
"lessThan": "357e8a77a501d96c9517f01f4a211eed5e9c9184",
"versionType": "git"
}
],
"programFiles": [
"kernel/events/core.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.9"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.9",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.113",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.56",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.10",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"kernel/events/core.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-98655
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #48889 · Revision 1
- Added to Heist Feed
- Publisher date