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NVD / CVE Program· CNA Linux

CVE-2026-90088: Bluetooth: RFCOMM: Validate MTU in rfcomm_apply_pn() to prevent infinite loop

Noroxi assessment

Priority: Monitor (action score 0/100)

  • 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: 0.21% (FIRST EPSS).
  • Fixed version: Linux Linux 3988cbb1be501dbff909a2ee024670e3c955a66d, 44c98fd082eafd49d55a8a4077ff488175b2fe24, 9b2e5f1928c99224345a9ed8c5dae5fc74964d6d; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1.

Low priority for now. Upgrade to Linux Linux 3988cbb1be501dbff909a2ee024670e3c955a66d, 44c98fd082eafd49d55a8a4077ff488175b2fe24, 9b2e5f1928c99224345a9ed8c5dae5fc74964d6d; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1 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: Bluetooth: RFCOMM: Validate MTU in rfcomm_apply_pn() to prevent infinite loop rfcomm_apply_pn() accepts the MTU value from a remote PN (Parameter Negotiation) frame without checking for zero. When the remote peer sends an MTU of zero, d->mtu is set to 0. This causes the sendmsg path to enter an infinite loop when fragmenting data, as each fragment has size == min_t(size_t, len, 0) == 0, so the remaining length never decreases. The infinite allocation of zero-length skbs exhausts all system memory. Fix by clamping d->mtu to RFCOMM_DEFAULT_MTU when the negotiated value is zero, consistent with the initial value assigned in rfcomm_dlc_alloc().

—No exploit Fix available
Published
Sep 17, 2026
Updated
Oct 19, 2026
EPSS
0.2% · 12th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

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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

    • 2.6.12affected
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before e7c0aa45ae6c5a338661b23812bfcdef50bf3e96affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before cbc2962da99b6b89345267d3aa74b4b573340548affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 9b2e5f1928c99224345a9ed8c5dae5fc74964d6daffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before fc4851ff8dfb505e9a19efcc286712132bbd178daffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before f561e44261344adadf9d6a6dff31e3af9776d5c6affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before aeee917a4878af95f0c63e18c5f22eaf6299c7b8affected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 3988cbb1be501dbff909a2ee024670e3c955a66daffected · git
    • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 44c98fd082eafd49d55a8a4077ff488175b2fe24affected · git
    • before 2.6.12not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.6-17.2.6-1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSkernel-64kbbefore 5.14.21-150400.24.246.15.14.21-150400.24.246.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSkernel-docsbefore 5.14.21-150400.24.246.15.14.21-150400.24.246.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSkernel-obs-buildbefore 5.14.21-150400.24.246.15.14.21-150400.24.246.1
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOSkernel-symsbefore 5.14.21-150400.24.246.15.14.21-150400.24.246.1
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOSkernel-64kbbefore 5.14.21-150500.55.195.15.14.21-150500.55.195.1
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOSkernel-docsbefore 5.14.21-150500.55.195.15.14.21-150500.55.195.1
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOSkernel-obs-buildbefore 5.14.21-150500.55.195.15.14.21-150500.55.195.1
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOSkernel-symsbefore 5.14.21-150500.55.195.15.14.21-150500.55.195.1
SUSE:Linux Enterprise Live Patching 15 SP4kernel-livepatch-SLE15-SP4_Update_61before 1-150400.9.3.11-150400.9.3.1
SUSE:Linux Enterprise Live Patching 15 SP5kernel-livepatch-SLE15-SP5_Update_47before 1-150500.11.3.11-150500.11.3.1
SUSE:Linux Enterprise Micro 5.3kernel-defaultbefore 5.14.21-150400.24.246.15.14.21-150400.24.246.1
SUSE:Linux Enterprise Micro 5.3kernel-default-basebefore 5.14.21-150400.24.246.1.150400.24.124.15.14.21-150400.24.246.1.150400.24.124.1
SUSE:Linux Enterprise Micro 5.3kernel-sourcebefore 5.14.21-150400.24.246.15.14.21-150400.24.246.1
SUSE:Linux Enterprise Micro 5.4kernel-rtbefore 5.14.21-150400.15.192.25.14.21-150400.15.192.2
SUSE:Linux Enterprise Micro 5.4kernel-source-rtbefore 5.14.21-150400.15.192.25.14.21-150400.15.192.2
SUSE:Linux Enterprise Micro 5.5kernel-defaultbefore 5.14.21-150500.55.195.15.14.21-150500.55.195.1
SUSE:Linux Enterprise Micro 5.5kernel-default-basebefore 5.14.21-150500.55.195.1.150500.6.91.15.14.21-150500.55.195.1.150500.6.91.1
SUSE:Linux Enterprise Micro 5.5kernel-rtbefore 5.14.21-150500.13.167.25.14.21-150500.13.167.2
SUSE:Linux Enterprise Micro 5.5kernel-sourcebefore 5.14.21-150500.55.195.15.14.21-150500.55.195.1
SUSE:Linux Enterprise Micro 5.5kernel-source-rtbefore 5.14.21-150500.13.167.25.14.21-150500.13.167.2

+9

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-2026-90086Sep 17, 2026 · xsk: honor XDP_TX_METADATA in zero-copy path
    0Monitor
  • ← EarlierCVE-2026-90087Sep 17, 2026 · Bluetooth: do not leak an hci_conn when a second LE connect is rejected
    0Monitor
  • Later →CVE-2026-90089Sep 17, 2026 · Bluetooth: btnxpuart: Validate the FW dump header length
    28Monitor

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 Linux3988cbb1be501dbff909a2ee024670e3c955a66dVendor (CNA)
Linux Linux44c98fd082eafd49d55a8a4077ff488175b2fe24Vendor (CNA)
Linux Linux9b2e5f1928c99224345a9ed8c5dae5fc74964d6dVendor (CNA)
Linux Linuxaeee917a4878af95f0c63e18c5f22eaf6299c7b8Vendor (CNA)
Linux Linuxcbc2962da99b6b89345267d3aa74b4b573340548Vendor (CNA)
Linux Linuxe7c0aa45ae6c5a338661b23812bfcdef50bf3e96Vendor (CNA)
Linux Linuxf561e44261344adadf9d6a6dff31e3af9776d5c6Vendor (CNA)
Linux Linuxfc4851ff8dfb505e9a19efcc286712132bbd178dVendor (CNA)
azl3 kernel 6.6.150.1-1 on Azure Linux 3.0—Microsoft (MSRC)
azl3 kernel 6.6.152.1-1 on Azure Linux 3.06.6.157.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package registry (OSV)
suse:kernel-64kb5.14.21-150500.55.195.1 · SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOSPackage registry (OSV)
suse:kernel-default3.0.101-108.223.1 · SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME COREPackage registry (OSV)
suse:kernel-default-base5.14.21-150500.55.195.1.150500.6.91.1 · SUSE:Linux Enterprise Micro 5.5Package registry (OSV)
suse:kernel-docs3.0.101-108.223.1 · SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME COREPackage registry (OSV)
suse:kernel-ec23.0.101-108.223.1 · SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME COREPackage registry (OSV)
suse:kernel-livepatch-SLE15-SP5_Update_471-150500.11.3.1 · SUSE:Linux Enterprise Live Patching 15 SP5Package registry (OSV)
suse:kernel-obs-build5.14.21-150500.55.195.1 · SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOSPackage registry (OSV)
suse:kernel-source3.0.101-108.223.1 · SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME COREPackage registry (OSV)
suse:kernel-syms3.0.101-108.223.1 · SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME COREPackage registry (OSV)
suse:kernel-trace3.0.101-108.223.1 · SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME COREPackage registry (OSV)
suse:kernel-xen3.0.101-108.223.1 · SUSE:Linux Enterprise Server 11 SP4 LTSS EXTREME COREPackage registry (OSV)
suse:kernel-zfcpdump5.14.21-150500.55.195.1 · SUSE:Linux Enterprise Server 15 SP5-LTSSPackage 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.

No dated events beyond publication.

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

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

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✗ → ✓

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

References

Show all references (7 more)

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

All records