In the Linux kernel, the following vulnerability has been resolved: protect the fetch of ->fd[fd] in do_dup2() from mispredictions both callers have verified that fd is not greater than ->max_fds; however, misprediction might end up with tofree = fdt->fd[fd]; being speculatively executed. That's wrong for the same reasons why it's wrong in close_fd()/file_close_fd_locked(); the same solution applies - array_index_nospec(fd, fdt->max_fds) could differ from fd only in case of speculative execution on mispredicted path.

Metrics

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

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-0:4.18.0-553.22.1.el8_10 cpe:/o:redhat:enterprise_linux:8 RHSA-2024:7000 2024-09-24T00:00:00Z
References
Link Providers
https://git.kernel.org/stable/c/08775b3d6ed117cf4518754ec7300ee42b6a5368 cve-icon cve-icon
https://git.kernel.org/stable/c/1171ceccabfd596ca370c5d2cbb47d110c3f2fe1 cve-icon cve-icon
https://git.kernel.org/stable/c/3f480493550b6a23d3a65d095d6569d4a7f56a0f cve-icon cve-icon
https://git.kernel.org/stable/c/41a6c31df77bd8e050136b0a200b537da9e1084a cve-icon cve-icon
https://git.kernel.org/stable/c/5db999fff545b924b24c9afd368ef5c17279b176 cve-icon cve-icon
https://git.kernel.org/stable/c/8aa37bde1a7b645816cda8b80df4753ecf172bf1 cve-icon cve-icon
https://git.kernel.org/stable/c/da72e783afd27d9f487836b2e6738146c0edd149 cve-icon cve-icon
https://git.kernel.org/stable/c/ed42e8ff509d2a61c6642d1825032072dab79f26 cve-icon cve-icon
https://lore.kernel.org/linux-cve-announce/2024081737-CVE-2024-42265-a943@gregkh/T cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2024-42265 cve-icon
https://www.cve.org/CVERecord?id=CVE-2024-42265 cve-icon
History

Fri, 27 Sep 2024 14:45:00 +0000

Type Values Removed Values Added
Weaknesses CWE-99

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

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

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'}

Mon, 19 Aug 2024 19:15:00 +0000

Type Values Removed Values Added
References
Metrics threat_severity

None

 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'}

threat_severity

Moderate

Mon, 19 Aug 2024 04:45:00 +0000

Type Values Removed Values Added
References

Sat, 17 Aug 2024 09:00:00 +0000

Type Values Removed Values Added
Description In the Linux kernel, the following vulnerability has been resolved: protect the fetch of ->fd[fd] in do_dup2() from mispredictions both callers have verified that fd is not greater than ->max_fds; however, misprediction might end up with tofree = fdt->fd[fd]; being speculatively executed. That's wrong for the same reasons why it's wrong in close_fd()/file_close_fd_locked(); the same solution applies - array_index_nospec(fd, fdt->max_fds) could differ from fd only in case of speculative execution on mispredicted path.
Title protect the fetch of ->fd[fd] in do_dup2() from mispredictions
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published: 2024-08-17T08:54:21.636Z

Updated: 2024-12-19T09:15:09.647Z

Reserved: 2024-07-30T07:40:12.259Z

Link: CVE-2024-42265

cve-icon Vulnrichment

Updated: 2024-09-11T12:42:14.436Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2024-08-17T09:15:07.893

Modified: 2024-08-19T12:59:59.177

Link: CVE-2024-42265

cve-icon Redhat

Severity : Moderate

Publid Date: 2024-08-17T00:00:00Z

Links: CVE-2024-42265 - Bugzilla