CVE-2026-31513
published 2026-04-22CVE-2026-31513: 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…
PriorityP344high8.1CVSS 3.1
AVAACLPRNUINSUCHINAH
EPSS
0.25%
16.7th percentile
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.
Affected
11 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linux | linux | >= 6.12.75 < 6.12.80 | 6.12.80 |
| linux | linux | >= 6.18.16 < 6.18.21 | 6.18.21 |
| linux | linux | >= 6.19.6 < 6.19.11 | 6.19.11 |
| linux | linux | >= 935f324e4b2461df2cf7f02b4195082b4304c708 < c8e1a27edb8b4e5afb56b384acd7b6c2dec1b7cc | c8e1a27edb8b4e5afb56b384acd7b6c2dec1b7cc |
| linux | linux | >= c28d2bff70444a85b3b86aaf241ece9408c7858c < 9d87cb22195b2c67405f5485d525190747ad5493 | 9d87cb22195b2c67405f5485d525190747ad5493 |
| linux | linux | >= e981a9392800ce2c5bca196a6ab2c55e9370efaa < 5b35f8211a913cfe7ab9d54fa36a272d2059a588 | 5b35f8211a913cfe7ab9d54fa36a272d2059a588 |
| linux | linux | >= f3fdf2e7276a3edc5df55454275da20eac186970 < a3d9c50d69785ae02e153f000da1b5fd6dbfdf1b | a3d9c50d69785ae02e153f000da1b5fd6dbfdf1b |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 6.12.75 < 6.12.80 | 6.12.80 |
| linux | linux_kernel | >= 6.18.16 < 6.18.21 | 6.18.21 |
| linux | linux_kernel | >= 6.19.6 < 6.19.11 | 6.19.11 |
CVSS provenance
nvdv3.18.1HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
vendor_redhat7.0MEDIUM
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Red Hat
kernel: Bluetooth: L2CAP: Fix stack-out-of-bounds read in l2cap_ecred_conn_req
vendor_redhat·2026-04-22·CVSS 7.0
CVE-2026-31513 [MEDIUM] CWE-125 kernel: Bluetooth: L2CAP: Fix stack-out-of-bounds read in l2cap_ecred_conn_req
kernel: Bluetooth: L2CAP: Fix stack-out-of-bounds read in l2cap_ecred_conn_req
A flaw was found in the Linux kernel's Bluetooth L2CAP (Logical Link Control and Adaptation Protocol) component. A remote attacker can send a specially crafted Enhanced Credit Based Connection Request with an excessive number of Source Channel IDs (SCIDs). This can cause a stack-out-of-bounds read when processing the malformed request, leading to a kernel panic and a Denial of Service (DoS) on the affected system.
Package: kernel (Red Hat Enterprise Linux 10) - Affected
Package: kernel (Red Hat Enterprise Linux 6) - Not affected
Package: kernel (Red Hat Enterprise Linux 7) - Affected
Package: kernel-rt (Red Hat Enterprise Linux 7) - Affected
Package: kernel (Red Hat Enterprise Linux 8) - Affected
Package:
GHSA
GHSA-8h97-6438-987h: In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: L2CAP: Fix stack-out-of-bounds read in l2cap_ecred_conn_req
Syzbot re
ghsa_unreviewed·2026-04-22
CVE-2026-31513 GHSA-8h97-6438-987h: In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: L2CAP: Fix stack-out-of-bounds read in l2cap_ecred_conn_req
Syzbot re
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
a
No detection rules found.
No public exploits indexed.
2026-04-22
Published