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NVD / CVE Program· CNA Linux

CVE-2026-99236: tracing: Reject incomplete event filter expressions

Noroxi assessment

Priority: Monitor (action score 31/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.12% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 1008e9e0b8280d47f1ab5e9c113f666a023a9697, 15ff3cc7f2beecc3f95d66358f20ad7b057466aa, 1fdc4164e488916402badddbb1f51e9380dabb91.

Low priority for now. Upgrade to Linux Linux 1008e9e0b8280d47f1ab5e9c113f666a023a9697, 15ff3cc7f2beecc3f95d66358f20ad7b057466aa, 1fdc4164e488916402badddbb1f51e9380dabb91 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: tracing: Reject incomplete event filter expressions A non-empty expression normally finishes in predicate_parse()'s inner loop, which resolves the pending logical operators before jumping to finalization. If the input ends after an operator, possibly followed by unary '!' tokens, the outer loop instead falls through with unresolved operator state. For example, "common_pid == 1 || common_pid == 2 &&" leaves prog[0].target equal to -1. The second pass then reads prog[-1] before the forward-jump check can reject it. Depending on adjacent slab contents, it can also copy an out-of-bounds word into a branch target that passes the forward-only check. A self-targeted perf tracepoint counting event can reach this path through PERF_EVENT_IOC_SET_FILTER. Reject the outer-loop fallthrough when a predicate has already been parsed. This ensures that non-empty expressions only reach finalization after the inner loop has resolved their operators. Keep the existing no-filter error for input that has no predicates. Add a regression test for trailing logical operators and unary negations.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Nov 2, 2026
Updated
Nov 3, 2026
EPSS
0.1% · 2th percentile
CWE
—

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CNA vs NVD score

NVD
—
CNA · Linux
7.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 4.17affected
    • 80765597bc587feae8dbc8ce97a0f32e12a6e625 and later · before 4a1a6d35359991c5d47f4bf101cfbe1475c94093affected · git
    • 80765597bc587feae8dbc8ce97a0f32e12a6e625 and later · before 2a98f5d4913ec081e08e1075512cb7ec313d9f72affected · git
    • 80765597bc587feae8dbc8ce97a0f32e12a6e625 and later · before 15ff3cc7f2beecc3f95d66358f20ad7b057466aaaffected · git
    • 80765597bc587feae8dbc8ce97a0f32e12a6e625 and later · before b205ff58e02922ac324f931cf9eb238a3acdb048affected · git
    • 80765597bc587feae8dbc8ce97a0f32e12a6e625 and later · before 5a999b5a16530898f0dbe5f8c50fd45ea72e110baffected · git
    • 80765597bc587feae8dbc8ce97a0f32e12a6e625 and later · before 1008e9e0b8280d47f1ab5e9c113f666a023a9697affected · git
    • 80765597bc587feae8dbc8ce97a0f32e12a6e625 and later · before 64993d970dde2a2da353e9e99595a4fa88ec27d9affected · git
    • 80765597bc587feae8dbc8ce97a0f32e12a6e625 and later · before 5bcdf3c18c3471122ee9652b0e2f5cdb718d9a46affected · git
    • 80765597bc587feae8dbc8ce97a0f32e12a6e625 and later · before 1fdc4164e488916402badddbb1f51e9380dabb91affected · git

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
Debian:13linuxbefore 6.12.115-16.12.115-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-99234Nov 2, 2026 · tracing: Unregister field variable histograms when the command fails
    0Monitor
  • ← EarlierCVE-2026-99235Nov 2, 2026 · tracing: Save the event file instead of the compatible histogram
    31Monitor
  • Later →CVE-2026-99237Nov 2, 2026 · tracing: Hold trace_types_lock when resetting last boot data from readers
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux1008e9e0b8280d47f1ab5e9c113f666a023a9697Vendor (CNA)
Linux Linux15ff3cc7f2beecc3f95d66358f20ad7b057466aaVendor (CNA)
Linux Linux1fdc4164e488916402badddbb1f51e9380dabb91Vendor (CNA)
Linux Linux2a98f5d4913ec081e08e1075512cb7ec313d9f72Vendor (CNA)
Linux Linux4a1a6d35359991c5d47f4bf101cfbe1475c94093Vendor (CNA)
Linux Linux5a999b5a16530898f0dbe5f8c50fd45ea72e110bVendor (CNA)
Linux Linux5bcdf3c18c3471122ee9652b0e2f5cdb718d9a46Vendor (CNA)
Linux Linux64993d970dde2a2da353e9e99595a4fa88ec27d9Vendor (CNA)
Linux Linuxb205ff58e02922ac324f931cf9eb238a3acdb048Vendor (CNA)
debian:linux6.12.115-1 · Debian:13Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 5, 2026+3 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓
  2. Exploit maturity— → none

For records you follow, these changes also arrive as notifications. →

References

Show all references (8 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records