VulnerabilityPublished 18 Oct 2026Updated 21 Oct 2026

CVE-2026-98655: Linux kernel · perf: Require kernel access for text poke events

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in e506333d1b9f42f1e402acebf1283af3c44a3809 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:07 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 7% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in e506333d1b9f42f1e402acebf1283af3c44a3809, 8473f44db9f710ea6f8cafb22f2e3ba6cb8ca9a7, 677d0b51ac1a0db55d768c4c6399210b3de0795b +2

Exploitation evidence

Disclosed: evidence found.
CVE published 18 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ e17d43b93e544f5016c0251d2074c15568d5d963, < e506333d1b9f42f1e402acebf1283af3c44a3809	Fixed in e506333d1b9f42f1e402acebf1283af3c44a3809
LinuxLinux	Affected ≥ e17d43b93e544f5016c0251d2074c15568d5d963, < 8473f44db9f710ea6f8cafb22f2e3ba6cb8ca9a7	Fixed in 8473f44db9f710ea6f8cafb22f2e3ba6cb8ca9a7
LinuxLinux	Affected ≥ e17d43b93e544f5016c0251d2074c15568d5d963, < 677d0b51ac1a0db55d768c4c6399210b3de0795b	Fixed in 677d0b51ac1a0db55d768c4c6399210b3de0795b
LinuxLinux	Affected ≥ e17d43b93e544f5016c0251d2074c15568d5d963, < 357e8a77a501d96c9517f01f4a211eed5e9c9184	Fixed in 357e8a77a501d96c9517f01f4a211eed5e9c9184
LinuxLinux	Affected ≥ e17d43b93e544f5016c0251d2074c15568d5d963, < 8c38cb055f6a9651198780e4e4d5283de4039f79	Fixed in 8c38cb055f6a9651198780e4e4d5283de4039f79
LinuxLinux	Affected =5.9	Fixed in–

Description

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.

References

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