What is CVE-2026-31513?

CVE-2026-31513 is a High severity Linux kernel vulnerability with a CVSS score of 8.1 out of 10, classified as a Out-of-bounds Read flaw (CWE-125), affecting Linux kernel versions from 6.12.75 onward and patched in 6.12.80, 6.18.21 and 6.19.11. CVE-2026-31513 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2026-31513?

CVE-2026-31513 has a CVSS score of 8.1 out of 10, rated High severity. The vector string is CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.

Is there a patch available for CVE-2026-31513?

Yes, CVE-2026-31513 has been patched. Fixed versions include 6.12.80, 6.18.21 and 6.19.11. If you are running Linux kernel 6.12.75 or later up to the fix versions, apply the relevant patch for your kernel branch.

Is CVE-2026-31513 actively exploited?

CVE-2026-31513 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is Out-of-bounds Read (CWE-125)?

The product reads data past the end or before the beginning of the intended buffer. See MITRE CWE for full details: https://cwe.mitre.org/data/definitions/125.html

CVE-2026-31513

High

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix stack-out-of-bounds read in l2cap_ecred_conn_req Syzbot reported a KASAN stack-out-of-bounds read in l2cap_build_cmd() that is triggered by a malformed Enhanced Credit Based Connection Request. The vulnerability stems from l2cap_ecred_conn_req(). The function allocates a local stack buffer (`pdu`) designed to hold a maximum of 5 Source Channel IDs (SCIDs), totaling 18 bytes. When an attacker sends a request with more than 5 SCIDs, the function calculates `rsp_len` based on this unvalidated `cmd_len` before checking if the number of SCIDs exceeds L2CAP_ECRED_MAX_CID. If the SCID count is too high, the function correctly jumps to the `response` label to reject the packet, but `rsp_len` retains the attacker's oversized value. Consequently, l2cap_send_cmd() is instructed to read past the end of the 18-byte `pdu` buffer, triggering a KASAN panic. Fix this by moving the assignment of `rsp_len` to after the `num_scid` boundary check. If the packet is rejected, `rsp_len` will safely remain 0, and the error response will only read the 8-byte base header from the stack.

Package Linux Kernel

Published 2026-04-22

Last modified 2026-04-28

CVSS version 3.1

Patch available

Yes

CVSS 3.1 score

8.1

out of 10

High

Attack Vector

Adjacent

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

High

Vector string

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

Weakness type

CWE-125

CVE-2026-31513 is a Out-of-bounds Read vulnerability

What is Out-of-bounds Read?

The product reads data past the end or before the beginning of the intended buffer. Learn more on MITRE CWE

Affected versions

Linux kernel versions 6.12.75, 6.18.16, 6.19.6 and later are affected. Fixed in 6.12.80, 6.18.21, 6.19.11 and their respective stable series.

Affected from

≥ 6.12.75 ≥ 6.18.16 ≥ 6.19.6

Fixed in

✓ 6.12.80 6.12.x ✓ 6.18.21 6.18.x ✓ 6.19.11 6.19.x

References

4 total

Kernel Git
https://git.kernel.org/stable/c/5b35f8211a913cfe7ab9d54fa36a272d2059a588

Patch
Kernel Git
https://git.kernel.org/stable/c/9d87cb22195b2c67405f5485d525190747ad5493

Patch
Kernel Git
https://git.kernel.org/stable/c/a3d9c50d69785ae02e153f000da1b5fd6dbfdf1b

Patch
Kernel Git
https://git.kernel.org/stable/c/c8e1a27edb8b4e5afb56b384acd7b6c2dec1b7cc

Patch

Details

CVE ID CVE-2026-31513

Severity High

CVSS score 8.1 / 10

CVSS version 3.1

Published 2026-04-22

Modified 2026-04-28

KEV No

Patch

Yes

Package linux

Frequently asked questions

What is CVE-2026-31513?

CVE-2026-31513 is a High severity Linux kernel vulnerability with a CVSS score of 8.1 out of 10 , classified as an Out-of-bounds Read flaw (CWE-125) . It affects Linux kernel versions from 6.12.75 onward and has been patched in 6.12.80, 6.18.21 and 6.19.11. CVE-2026-31513 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2026-31513?

CVE-2026-31513 has a CVSS score of 8.1 out of 10, rated High severity (CVSS 3.1). The vector string is CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.
Is there a patch available for CVE-2026-31513?

Yes. CVE-2026-31513 has been patched. Fixed versions include 6.12.80, 6.18.21 and 6.19.11. If you are running Linux kernel 6.12.75 or later up to the fix versions, apply the relevant patch for your kernel branch.
Is CVE-2026-31513 actively exploited?

No. CVE-2026-31513 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.