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Review reviewHigh

CVE-2026-63975

Linux

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix possible crash on l2cap_ecred_conn_rsp If dcid is received for an already-assigned destination CID the spec requires that both channels to be discarded, but calling l2cap_chan_del may invalidate the tmp cursor created by list_for_each_entry_safe and in fact it is the wrong procedure as the chan->dcid may be assigned previously it really needs to be disconnected. Calling l2cap_chan_clone directly may still lead to l2cap_chan_del so instead schedule l2cap_chan_timeout with delay 0 to close the channel as...

CVSS
8.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.07.20
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 8.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix possible crash on l2cap_ecred_conn_rsp If dcid is received for an already-assigned destination CID the spec requires that both channels to be discarded, but calling l2cap_chan_del may invalidate the tmp cursor created by list_for_each_entry_safe and in fact it is the wrong procedure as the chan->dcid may be assigned previously it really needs to be disconnected. Calling l2cap_chan_clone directly may still lead to l2cap_chan_del so instead schedule l2cap_chan_timeout with delay 0 to close the channel as...

Affected product and versions

Product
Linux
Affected versions
>= 15f02b91056253e8cdc592888f431da0731337b8 < 3c8eaa91eb433c450426539290be4ffe282e9f00, >= 15f02b91056253e8cdc592888f431da0731337b8 < ecfed1e0d8efecad6737a0d83e21d2fd021d8c48, >= 15f02b91056253e8cdc592888f431da0731337b8 < e6833e737a51db1e5ea0401322acf5e22abd8be6, >= 15f02b91056253e8cdc592888f431da0731337b8 < 6319b38fe69f56ed95680ade485b957a53fff642, >= 15f02b91056253e8cdc592888f431da0731337b8 < 291eec1041c918c460dc9702e44edd17794b4a4b, >= 15f02b91056253e8cdc592888f431da0731337b8 < 41e29548b5e8b5e5fcf708786b3bea67cab107fa, >= 15f02b91056253e8cdc592888f431da0731337b8 < d153b8898c0051eb8b6a083b35cbe304a5886bd5, >= 15f02b91056253e8cdc592888f431da0731337b8 < 41c2713b204e6cb6a94587bc6bf6935107df5479, >= 5.7
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
Not available
CVE-2026-63975 — Linux | SECUFOCUS NOW