CVE-2026-31498: In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix ERTM re-init and ze

Q: How do I fix CVE-2026-31498?

linux kernel: upgrade to 4.5, 4.10, 4.15, 4.20, 5.5, 5.10.253, 5.15.203, 6.1.168, 6.6.131, 6.12.80, 6.18.21, 6.19.11. Exact commands for each OS are on this page.

Q: Is CVE-2026-31498 being exploited?

CVE-2026-31498 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-31498 affect?

CVE-2026-31498 affects linux kernel. Severity is medium (CVSS 5.5). In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix ERTM re-init and zero pdu_len infinite loop l2cap_config_req() processes CONFIG_REQ for channels in BT_CONNECTED state to support L2CAP reconfigurat

Q: How urgent is CVE-2026-31498?

Priority 25/100. On your watchlist

Routine

MEDIUM 5.5WATCHLISTUPGRADE

CVE-2026-31498 is a medium-severity flaw (CVSS 5.5) affecting linux kernel. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix ERTM re-init and zero pdu_len infinite loop l2cap_config_req() processes CONFIG_REQ for channels in BT_CONNECTED state to support L2CAP reconfiguration (e.g. MTU changes). However, since both CONF_INPUT_DONE and CONF_OUTPUT_DONE are already set from the initial configuration, the reconfiguration path falls through to l2cap_ertm_init(), which re-initializes

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.1% (top 98%)
CISA exploited list	No
Weakness	CWE-835
Published	2026-04-22
Last modified	2026-06-17

Publisher (CNA): kernel.org · Vendor: linux

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-22 14:16 UTCPublished CVE record published
2026-06-17 10:33 UTCUpdated Record last modified

linux linux kernel UPGRADE

Affected: >= 4.4.238 and < 4.5 · >= 4.9.238 and < 4.10 · >= 4.14.200 and < 4.15 · >= 4.19.149 and < 4.20 · >= 5.4.69 and < 5.5 · >= 5.7.1 and < 5.10.253 · >= 5.11 and < 5.15.203 · >= 5.16 and < 6.1.168

Fixed in: 4.5, 4.10, 4.15, 4.20, 5.5, 5.10.253, 5.15.203, 6.1.168, 6.6.131, 6.12.80, 6.18.21, 6.19.11

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-31498?

linux kernel: upgrade to 4.5, 4.10, 4.15, 4.20, 5.5, 5.10.253, 5.15.203, 6.1.168, 6.6.131, 6.12.80, 6.18.21, 6.19.11. Exact commands for each OS are on this page.

Is CVE-2026-31498 being exploited?

CVE-2026-31498 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-31498 affect?

CVE-2026-31498 affects linux kernel. Severity is medium (CVSS 5.5). In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix ERTM re-init and zero pdu_len infinite loop l2cap_config_req() processes CONFIG_REQ for channels in BT_CONNECTED state to support L2CAP reconfigurat

How urgent is CVE-2026-31498?

Priority 25/100. On your watchlist

Software pages

Linux kernel vulnerabilities · Bluetooth vulnerabilities

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References

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