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Advisory severityHigh7.0Vendor: MediumRed Hat Linux

High [CVE-2026-63975] Fix possible crash on l2cap_ecred_conn_rsp

This high-severity Red Hat Linux advisory covers CVE-2026-63975 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-63975 Source published Source updated

VulniPulse record published Record updated

CVE-2026-63975
Affected products & platforms
Red Hat LinuxLinux Kernel
Open source advisory

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Summary

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. A flaw was found in the Bluetooth L2CAP (Logical Link Control and Adaptation Protocol) component of the Linux kernel.

When a device receives a connection response with an already-assigned destination Channel Identifier (CID), the system may crash. This occurs because the kernel's procedure for discarding both channels in this scenario can lead to incorrect channel deletion, causing instability.

This vulnerability can be triggered by a remote attacker sending a specially crafted Bluetooth L2CAP packet, potentially leading to a denial of service. Red Hat severity: Moderate — CVSS 7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H).

Weakness: CWE-825. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9.

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.

Official advisory · high-confidence parse· fetched 7 days ago·verify at source

Fixed versions
  • kernel-0:6.12.0-211.53.1.el10_2
  • kernel-rt-0:4.18.0-553.166.1.rt7.507.el8_10
  • kernel-0:4.18.0-553.166.1.el8_10
  • kernel-0:5.14.0-687.47.1.el9_8
  • RHSA-2026:65334
  • RHSA-2026:70403
  • RHSA-2026:70402
  • RHSA-2026:67150

Official advisory · high-confidence parse· fetched 7 days ago·verify at source

Mitigation

Upgrade to a fixed release: kernel-0:6.12.0-211.53.1.el10_2, kernel-rt-0:4.18.0-553.166.1.rt7.507.el8_10, kernel-0:4.18.0-553.166.1.el8_10, kernel-0:5.14.0-687.47.1.el9_8, RHSA-2026:65334, RHSA-2026:70403. That is the remediation for this advisory.

The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.

Official advisory · high-confidence parse· fetched 7 days ago·verify at source

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