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CVE-2026-63975

HIGHCVSS 8.8/10EPSS 0.34%

Last modified

CVE-2026-63975 is a high-severity vulnerability rated 8.8/10 on the CVSS scale. 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 asynchronously.. EPSS estimates a 0.34% chance of exploitation in the next 30 days.

Description

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 asynchronously.

Metrics

CVSS 3.1
8.8/10

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

EPSS Probability
0.34%

27.1th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 15f02b91056253e8cdc592888f431da0731337b8, < 3c8eaa91eb433c450426539290be4ffe282e9f00; >= 15f02b91056253e8cdc592888f431da0731337b8, < ecfed1e0d8efecad6737a0d83e21d2fd021d8c48; >= 15f02b91056253e8cdc592888f431da0731337b8, < e6833e737a51db1e5ea0401322acf5e22abd8be6; >= 15f02b91056253e8cdc592888f431da0731337b8, < 6319b38fe69f56ed95680ade485b957a53fff642; >= 15f02b91056253e8cdc592888f431da0731337b8, < 291eec1041c918c460dc9702e44edd17794b4a4b; >= 15f02b91056253e8cdc592888f431da0731337b8, < 41e29548b5e8b5e5fcf708786b3bea67cab107fa; >= 15f02b91056253e8cdc592888f431da0731337b8, < d153b8898c0051eb8b6a083b35cbe304a5886bd5; >= 15f02b91056253e8cdc592888f431da0731337b8, < 41c2713b204e6cb6a94587bc6bf6935107df5479
LinuxLinux5.7

References

Timeline

Published
Last Modified
Status
Awaiting Analysis

Frequently Asked Questions

What is CVE-2026-63975?
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 asynchronously.
How severe is CVE-2026-63975?
CVE-2026-63975 has a CVSS score of 8.8/10 (HIGH severity). The EPSS model estimates a 0.34% probability of exploitation in the next 30 days.
How do I fix CVE-2026-63975?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST