CVE-2023-6915: Kernel: null pointer dereference vulnerability in ida_free in lib/idr.c
First published: Mon Dec 18 2023(Updated: )
A Null pointer de-reference problem was found in ida_free in lib/idr.c file when it calls the xas_load function and returns a null value, assigning NULL to the bitmap variable. Therefore, `if (xa_is_value(bitmap))` will fail and jump to the `else` branch. However, in the else branch, the statement `if (!test_bit(bit, bitmap->bitmap))` references the member of bitmap, which triggers a null pointer dereference vulnerability. Reference: <a href="https://github.com/torvalds/linux/commit/af73483f4e8b6f5c68c9aa63257bdd929a9c194a">https://github.com/torvalds/linux/commit/af73483f4e8b6f5c68c9aa63257bdd929a9c194a</a>
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | <6.7 | |
| Linux Kernel | =6.7-rc7 | |
| Linux Kernel | =6.7-rc8 | |
| Red Hat Enterprise Linux | =8.0 | |
| Red Hat Enterprise Linux | =9.0 | |
| 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 |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=2254982
- https://access.redhat.com/security/cve/CVE-2023-6915
- https://github.com/torvalds/linux/commit/af73483f4e8b6f5c68c9aa63257bdd929a9c194a
- https://access.redhat.com/errata/RHSA-2024:2394
- https://launchpad.net/bugs/cve/CVE-2023-6915
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2258419
- https://access.redhat.com/errata/RHSA-2024:2950
- https://access.redhat.com/errata/RHSA-2024:3138
- https://git.kernel.org/linus/af73483f4e8b6f5c68c9aa63257bdd929a9c194a
- https://security-tracker.debian.org/tracker/CVE-2023-6915
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-6915
- https://nvd.nist.gov/vuln/detail/CVE-2023-6915
- https://ubuntu.com/security/CVE-2023-6915
Frequently Asked Questions
What is the severity of CVE-2023-6915?
CVE-2023-6915 has a high severity due to its potential for causing system crashes through a null pointer dereference.
How do I fix CVE-2023-6915?
To fix CVE-2023-6915, update the Linux Kernel to a version that includes patches, such as those released after 6.7.
What software is affected by CVE-2023-6915?
CVE-2023-6915 affects several versions of the Linux Kernel and specific Red Hat Enterprise Linux versions.
What are the potential impacts of CVE-2023-6915?
Exploitation of CVE-2023-6915 could lead to denial of service by crashing the affected system.
Is there a workaround for CVE-2023-6915?
There are no known workarounds for CVE-2023-6915, so it is recommended to apply security updates promptly.
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