Linux Kernel up to 6.12.109/6.18.51/7.2.5 octeontx2-af tm_tree rvu_dbg_nix_tm_tree_display sq_ctx null pointer dereference

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CTI Interest Score
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4.0$0-$5k0.40

Summaryinfo

A vulnerability, which was classified as problematic, was found in Linux Kernel up to 6.12.109/6.18.51/7.2.5. Impacted is the function rvu_dbg_nix_tm_tree_display of the file /sys/kernel/debug/octeontx2/nix/tm_tree of the component octeontx2-af. Executing a manipulation of the argument sq_ctx can lead to null pointer dereference. This vulnerability is handled as CVE-2026-90085. It is possible to launch the attack on the local host. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in Linux Kernel up to 6.12.109/6.18.51/7.2.5. This vulnerability affects the function rvu_dbg_nix_tm_tree_display of the file /sys/kernel/debug/octeontx2/nix/tm_tree of the component octeontx2-af. The manipulation of the argument sq_ctx with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: octeontx2-af: fix NULL deref in NIX TM tree debugfs read path rvu_dbg_nix_tm_tree_display() dereferences pfvf->sq_ctx without checking whether the SQ context has been allocated. Reading /sys/kernel/debug/octeontx2/nix/tm_tree for a NIX LF whose transmit queues are not set up triggers a kernel oops. Guard the read path the same way rvu_dbg_nix_tm_tree_write() already does and return -EINVAL with a seq_file message when sq_ctx is NULL.

The advisory is shared for download at git.kernel.org. This vulnerability was named CVE-2026-90085 since 09/11/2026. The exploitation appears to be easy. The attack needs to be approached locally. The exploitation needs additional levels of successful authentication. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

Upgrading to version 6.12.110, 6.18.52, 7.2.6 or 7.3-rc1 eliminates this vulnerability. Applying the patch fb736d733b0a60377cf53010571c261886446fd5/537e11a1700f64dc6754108f0e1333ad63d4f548/fdf7358e2688f12eff41290bc45030b7aff0845e/ec65631bd5ec251cdf67a4919fac7a3149a6e235 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: 4.2
VulDB Meta Temp Score: 4.0

VulDB Base Score: 4.2
VulDB Temp Score: 4.0
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: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

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 6.12.110/6.18.52/7.2.6/7.3-rc1
Patch: fb736d733b0a60377cf53010571c261886446fd5/537e11a1700f64dc6754108f0e1333ad63d4f548/fdf7358e2688f12eff41290bc45030b7aff0845e/ec65631bd5ec251cdf67a4919fac7a3149a6e235

Timelineinfo

09/11/2026 CVE reserved
09/17/2026 +6 days Advisory disclosed
09/17/2026 +0 days VulDB entry created
09/17/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-90085 (🔒)
GCVE (CVE): GCVE-0-2026-90085
GCVE (VulDB): GCVE-100-406576

Entryinfo

Created: 09/17/2026 18:59
Changes: 09/17/2026 18:59 (61)
Complete: 🔍
Cache ID: 216::103

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