CVE-2023-6931: Out-of-bounds write in Linux kernel's Performance Events system component
First published: Mon Dec 04 2023(Updated: )
A flaw was found in the Linux kernel. It is possible to overflow a perf_event's read_size, causing an out-of-bounds write in perf_read_group(). The check meant to prevent such an overflow in perf_event_validate_size() does not account for groups of events with mixed read_format values. The flaw can be triggered with events created with PERF_FORMAT_GROUP or events added with PERF_FORMAT_GROUP after some preconditions. The bug was introduced around fa8c269353d5 ("perf/core: Invert perf_read_group() loops"). Fixes: a723968c0ed3 ("perf: Fix u16 overflows"). Reference: <a href="https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=382c27f4ed28f803b1f1473ac2d8db0afc795a1b">https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=382c27f4ed28f803b1f1473ac2d8db0afc795a1b</a>
Credit: cve-coordination@google.com cve-coordination@google.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.128-1 6.12.12-1 6.12.13-1 | |
| IBM QRadar Security Information and Event Manager | <=7.5 - 7.5.0 UP8 IF01 | |
| Linux kernel | >=4.3<6.7 | |
| Debian | =10.0 |
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Reference Links
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=382c27f4ed28f803b1f1473ac2d8db0afc795a1b
- https://kernel.dance/382c27f4ed28f803b1f1473ac2d8db0afc795a1b
- https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html
- https://lists.debian.org/debian-lts-announce/2024/01/msg00005.html
- https://launchpad.net/bugs/cve/CVE-2023-6931
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2255286
- https://access.redhat.com/errata/RHSA-2024:0930
- https://access.redhat.com/errata/RHSA-2024:1019
- https://access.redhat.com/errata/RHSA-2024:1018
- https://access.redhat.com/errata/RHSA-2024:1404
- https://access.redhat.com/errata/RHSA-2024:1607
- https://access.redhat.com/errata/RHSA-2024:1614
- https://access.redhat.com/errata/RHSA-2024:1840
- https://access.redhat.com/errata/RHSA-2024:1836
- https://access.redhat.com/errata/RHSA-2024:2394
- https://bugzilla.redhat.com/show_bug.cgi?id=2252731
- https://exchange.xforce.ibmcloud.com/vulnerabilities/275563
- https://www.ibm.com/support/pages/node/7150684 (Advisory)
- https://git.kernel.org/linus/382c27f4ed28f803b1f1473ac2d8db0afc795a1b
- https://security-tracker.debian.org/tracker/CVE-2023-6931
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-6931
- https://nvd.nist.gov/vuln/detail/CVE-2023-6931
- https://ubuntu.com/security/CVE-2023-6931
Frequently Asked Questions
What is the severity of CVE-2023-6931?
CVE-2023-6931 has been classified as a medium severity vulnerability affecting the Linux kernel.
How do I fix CVE-2023-6931?
To fix CVE-2023-6931, upgrade to a patched version of the Linux kernel that addresses this specific vulnerability.
What versions of the Linux kernel are affected by CVE-2023-6931?
CVE-2023-6931 affects Linux kernel versions from 4.3 up to, but not including, version 6.7.
Which distributions are impacted by CVE-2023-6931?
Distributions such as Debian 10.0 and IBM QRadar SIEM versions up to 7.5.0 UP8 IF01 are impacted by CVE-2023-6931.
What is the impact of CVE-2023-6931?
CVE-2023-6931 can lead to an out-of-bounds write in perf_read_group(), potentially allowing for unauthorized actions by an attacker.
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