Linux Kernel up to 6.11.7 btrfs insert_delayed_ref initialization

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4.9$0-$5k0.00

Summaryinfo

A vulnerability marked as problematic has been reported in Linux Kernel up to 6.11.7. This vulnerability affects the function insert_delayed_ref of the component btrfs. This manipulation causes initialization. The identification of this vulnerability is CVE-2024-50273. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 6.11.7 and classified as problematic. Affected by this vulnerability is the function insert_delayed_ref of the component btrfs. The manipulation with an unknown input leads to a initialization vulnerability. The CWE definition for the vulnerability is CWE-665. The product does not initialize or incorrectly initializes a resource, which might leave the resource in an unexpected state when it is accessed or used. The impact remains unknown. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: btrfs: reinitialize delayed ref list after deleting it from the list At insert_delayed_ref() if we need to update the action of an existing ref to BTRFS_DROP_DELAYED_REF, we delete the ref from its ref head's ref_add_list using list_del(), which leaves the ref's add_list member not reinitialized, as list_del() sets the next and prev members of the list to LIST_POISON1 and LIST_POISON2, respectively. If later we end up calling drop_delayed_ref() against the ref, which can happen during merging or when destroying delayed refs due to a transaction abort, we can trigger a crash since at drop_delayed_ref() we call list_empty() against the ref's add_list, which returns false since the list was not reinitialized after the list_del() and as a consequence we call list_del() again at drop_delayed_ref(). This results in an invalid list access since the next and prev members are set to poison pointers, resulting in a splat if CONFIG_LIST_HARDENED and CONFIG_DEBUG_LIST are set or invalid poison pointer dereferences otherwise. So fix this by deleting from the list with list_del_init() instead.

It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2024-50273 since 10/21/2024. The exploitation appears to be difficult. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 211777 (Debian dsa-5818 : affs-modules-6.1.0-21-4kc-malta-di - security update), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 4.19.324, 5.4.286, 5.10.230, 5.15.172, 6.1.117, 6.6.61 or 6.11.8 eliminates this vulnerability. Applying the patch 2fd0948a483e/93c5b8decc0e/bf0b0c6d1597/c24fa427fc0a/2cb1a73d1d44/f04be6d68f71/50a3933760b4/c9a75ec45f11 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (211777) and CERT Bund (WID-SEC-2024-3497). Be aware that VulDB is the high quality source for vulnerability data.

Affected

  • Debian Linux
  • Google Cloud Platform
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • Kyocera Printer
  • IGEL OS
  • Lenovo Computer
  • Dell PowerEdge
  • RESF Rocky Linux
  • Dell NetWorker
  • Dell Avamar
  • IBM QRadar SIEM
  • Red Hat OpenShift
  • Open Source Linux Kernel
  • IBM DataPower Gateway

Productinfo

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Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.0
VulDB Meta Temp Score: 4.9

VulDB Base Score: 4.6
VulDB Temp Score: 4.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Initialization
CWE: CWE-665
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 211777
Nessus Name: Debian dsa-5818 : affs-modules-6.1.0-21-4kc-malta-di - security update

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 4.19.324/5.4.286/5.10.230/5.15.172/6.1.117/6.6.61/6.11.8
Patch: 2fd0948a483e/93c5b8decc0e/bf0b0c6d1597/c24fa427fc0a/2cb1a73d1d44/f04be6d68f71/50a3933760b4/c9a75ec45f11

Timelineinfo

10/21/2024 🔍
11/19/2024 +29 days 🔍
11/19/2024 +0 days 🔍
10/22/2025 +337 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2024-50273 (🔍)
GCVE (CVE): GCVE-0-2024-50273
GCVE (VulDB): GCVE-100-285079
CERT Bund: WID-SEC-2024-3497 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 11/19/2024 06:15
Updated: 10/22/2025 09:16
Changes: 11/19/2024 06:15 (58), 11/25/2024 10:55 (2), 07/16/2025 14:54 (7), 10/02/2025 07:10 (12), 10/22/2025 09:16 (1)
Complete: 🔍
Cache ID: 216::103

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