<p>There is no fixed version for <code>RHEL:8</code> <code>perf</code>.</p>

NULL Pointer Dereference Affecting perf package, versions *

Threat Intelligence

0.04% (6^th percentile)

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Snyk ID SNYK-RHEL8-PERF-6654749
published 18 Apr 2024
disclosed 17 Apr 2024

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Introduced: 17 Apr 2024

CVE-2024-26903 Open this link in a new tab CWE-476 Open this link in a new tab

How to fix?

There is no fixed version for RHEL:8 perf.

NVD Description

Note: Versions mentioned in the description apply only to the upstream perf package and not the perf package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: rfcomm: Fix null-ptr-deref in rfcomm_check_security

During our fuzz testing of the connection and disconnection process at the RFCOMM layer, we discovered this bug. By comparing the packets from a normal connection and disconnection process with the testcase that triggered a KASAN report. We analyzed the cause of this bug as follows:

In the packets captured during a normal connection, the host sends a Read Encryption Key Size type of HCI_CMD packet (Command Opcode: 0x1408) to the controller to inquire the length of encryption key.After receiving this packet, the controller immediately replies with a Command Completepacket (Event Code: 0x0e) to return the Encryption Key Size.
In our fuzz test case, the timing of the controller's response to this packet was delayed to an unexpected point: after the RFCOMM and L2CAP layers had disconnected but before the HCI layer had disconnected.
After receiving the Encryption Key Size Response at the time described in point 2, the host still called the rfcomm_check_security function. However, by this time struct l2cap_conn *conn = l2cap_pi(sk)->chan->conn; had already been released, and when the function executed return hci_conn_security(conn->hcon, d->sec_level, auth_type, d->out);, specifically when accessing conn->hcon, a null-ptr-deref error occurred.

To fix this bug, check if sk->sk_state is BT_CLOSED before calling rfcomm_recv_frame in rfcomm_process_rx.

References

CVSS Scores

version 3.1

Attack Vector (AV)

Local
Attack Complexity (AC)

Low
Privileges Required (PR)

Low
User Interaction (UI)

None

Scope (S)

Unchanged

Confidentiality (C)

None
Integrity (I)

None
Availability (A)

High

NULL Pointer Dereference Affecting perf package, versions *

Severity

Based on Red Hat Enterprise Linux security rating