In the Linux kernel, the following vulnerability has been resolved: drivers: core: synchronize really_probe() and dev_uevent() Synchronize the dev->driver usage in really_probe() and dev_uevent(). These can run in different threads, what can result in the following race condition for dev->driver uninitialization: Thread #1: ========== really_probe() { ... probe_failed: ... device_unbind_cleanup(dev) { ... dev->driver = NULL; // <= Failed probe sets dev->driver to NULL ... } ... } Thread #2: ========== dev_uevent() { ... if (dev->driver) // If dev->driver is NULLed from really_probe() from here on, // after above check, the system crashes add_uevent_var(env, "DRIVER=%s", dev->driver->name); ... } really_probe() holds the lock, already. So nothing needs to be done there. dev_uevent() is called with lock held, often, too. But not always. What implies that we can't add any locking in dev_uevent() itself. So fix this race by adding the lock to the non-protected path. This is the path where above race is observed: dev_uevent+0x235/0x380 uevent_show+0x10c/0x1f0 <= Add lock here dev_attr_show+0x3a/0xa0 sysfs_kf_seq_show+0x17c/0x250 kernfs_seq_show+0x7c/0x90 seq_read_iter+0x2d7/0x940 kernfs_fop_read_iter+0xc6/0x310 vfs_read+0x5bc/0x6b0 ksys_read+0xeb/0x1b0 __x64_sys_read+0x42/0x50 x64_sys_call+0x27ad/0x2d30 do_syscall_64+0xcd/0x1d0 entry_SYSCALL_64_after_hwframe+0x77/0x7f Similar cases are reported by syzkaller in https://syzkaller.appspot.com/bug?extid=ffa8143439596313a85a But these are regarding the *initialization* of dev->driver dev->driver = drv; As this switches dev->driver to non-NULL these reports can be considered to be false-positives (which should be "fixed" by this commit, as well, though). The same issue was reported and tried to be fixed back in 2015 in https://lore.kernel.org/lkml/[email protected]/ already.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity High

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact partial

Affected Vendors & Products

Vendors Products
Redhat
  • Enterprise Linux

No data.

Package CPE Advisory Released Date
Red Hat Enterprise Linux 8
kernel-rt-0:4.18.0-553.22.1.rt7.363.el8_10 cpe:/a:redhat:enterprise_linux:8::nfv RHSA-2024:7001 2024-09-24T00:00:00Z
kernel-0:4.18.0-553.22.1.el8_10 cpe:/o:redhat:enterprise_linux:8 RHSA-2024:7000 2024-09-24T00:00:00Z
Red Hat Enterprise Linux 9
kernel-0:5.14.0-503.11.1.el9_5 cpe:/a:redhat:enterprise_linux:9 RHSA-2024:9315 2024-11-12T00:00:00Z
kernel-0:5.14.0-503.11.1.el9_5 cpe:/o:redhat:enterprise_linux:9 RHSA-2024:9315 2024-11-12T00:00:00Z
References
Link Providers
https://git.kernel.org/stable/c/08891eeaa97c079b7f95d60b62dcf0e3ce034b69 cve-icon cve-icon
https://git.kernel.org/stable/c/13d25e82b6d00d743c7961dcb260329f86bedf7c cve-icon cve-icon
https://git.kernel.org/stable/c/760603e30bf19d7b4c28e9d81f18b54fa3b745ad cve-icon cve-icon
https://git.kernel.org/stable/c/95d03d369ea647b89e950667f1c3363ea6f564e6 cve-icon cve-icon
https://git.kernel.org/stable/c/a42b0060d6ff2f7e59290a26d5f162a3c6329b90 cve-icon cve-icon
https://git.kernel.org/stable/c/bb3641a5831789d83a58a39ed4a928bcbece7080 cve-icon cve-icon
https://git.kernel.org/stable/c/c0a40097f0bc81deafc15f9195d1fb54595cd6d0 cve-icon cve-icon
https://git.kernel.org/stable/c/ec772ed7cb21b46fb132f89241682553efd0b721 cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2024071204-CVE-2024-39501-058b@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2024-39501 cve-icon
https://www.cve.org/CVERecord?id=CVE-2024-39501 cve-icon
History

Fri, 20 Dec 2024 08:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 13 Nov 2024 02:30:00 +0000

Type Values Removed Values Added
CPEs cpe:/a:redhat:enterprise_linux:9
cpe:/o:redhat:enterprise_linux:9

Wed, 06 Nov 2024 02:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-362
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

 cvssV3_1

{'score': 4.7, 'vector': 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H'}

Tue, 24 Sep 2024 11:00:00 +0000

Type Values Removed Values Added
CPEs cpe:/o:redhat:enterprise_linux:8

Tue, 24 Sep 2024 06:30:00 +0000

Type Values Removed Values Added
First Time appeared Redhat
Redhat enterprise Linux
CPEs cpe:/a:redhat:enterprise_linux:8::nfv
Vendors & Products Redhat
Redhat enterprise Linux

Thu, 12 Sep 2024 08:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Wed, 11 Sep 2024 13:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2024-07-12T12:20:34.980Z

Updated: 2024-12-19T09:07:24.772Z

Reserved: 2024-06-25T14:23:23.752Z

Link: CVE-2024-39501

cve-icon Vulnrichment

Updated: 2024-08-02T04:26:15.451Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2024-07-12T13:15:12.600

Modified: 2024-11-21T09:27:50.060

Link: CVE-2024-39501

cve-icon Redhat

Severity : Moderate

Publid Date: 2024-07-12T00:00:00Z

Links: CVE-2024-39501 - Bugzilla