Linux Kernel up to 6.12.110/6.18.52/7.2.6/7.3-rc1 BPF JIT fixups.c jit_subprogs input validation

CVSS Meta Temp Score
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CTI Interest Score
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7.8$0-$5k0.00+

Summaryinfo

A vulnerability labeled as very critical has been found in Linux Kernel up to 6.12.110/6.18.52/7.2.6/7.3-rc1. This affects the function jit_subprogs of the file fixups.c of the component BPF JIT. The manipulation results in input validation. This vulnerability is known as CVE-2026-98075. Attacking locally is a requirement. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.12.110/6.18.52/7.2.6/7.3-rc1. It has been classified as very critical. Affected is the function jit_subprogs of the file fixups.c of the component BPF JIT. The manipulation with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: bpf: reject BPF_PSEUDO_FUNC reference to the main program fixups.c:jit_subprogs() rewrites BPF_PSEUDO_FUNC loads to contain real function addresses. This function is invoked from bpf_jit_subprogs() only when env->subprog_cnt > 1. Meaning that for any program like below: int main(void *ctx) { void *ptr = main; ... bpf_timer_set_callback(..., ptr); ... } The 'ptr' won't be ever converted to contain an address. In combination with e.g. bpf_timer_set_callback() this would lead to a function call at a bogus address. Instead of complicating the implementation, just assume that no useful program needs main to be a sync or async callback and reject BPF_PSEUDO_FUNC loads for the main subprogram.

The advisory is shared for download at git.kernel.org. This vulnerability is traded as CVE-2026-98075 since 09/25/2026. The exploitability is told to be easy. The attack needs to be approached locally. The exploitation requires an enhanced level of successful authentication. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 09/25/2026).

Upgrading to version 6.12.111, 6.18.53, 7.2.7 or 7.3-rc2 eliminates this vulnerability. Applying the patch 118212417ba0120d99f84154799f8880f07411f4/d6c39774ae093c9f7009cc4ae918f18fc1af7ae7/92f0bd0e2b632c6565ac2214a4d7d2ed37e5b9f6/374b2c5561db80fcdd7cdce44af37a49416f61c7 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.2
VulDB Meta Temp Score: 7.8

VulDB Base Score: 8.2
VulDB Temp Score: 7.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.12.111/6.18.53/7.2.7/7.3-rc2
Patch: 118212417ba0120d99f84154799f8880f07411f4/d6c39774ae093c9f7009cc4ae918f18fc1af7ae7/92f0bd0e2b632c6565ac2214a4d7d2ed37e5b9f6/374b2c5561db80fcdd7cdce44af37a49416f61c7

Timelineinfo

09/25/2026 Advisory disclosed
09/25/2026 +0 days CVE reserved
09/25/2026 +0 days VulDB entry created
09/25/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-98075 (🔒)
GCVE (CVE): GCVE-0-2026-98075
GCVE (VulDB): GCVE-100-410280

Entryinfo

Created: 09/25/2026 16:23
Changes: 09/25/2026 16:23 (60)
Complete: 🔍
Cache ID: 216::103

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