CVE-2024-26603: x86/fpu: Stop relying on userspace for info to fault in xsave buffer
First published: Sat Feb 24 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: x86/fpu: Stop relying on userspace for info to fault in xsave buffer Before this change, the expected size of the user space buffer was taken from fx_sw->xstate_size. fx_sw->xstate_size can be changed from user-space, so it is possible construct a sigreturn frame where: * fx_sw->xstate_size is smaller than the size required by valid bits in fx_sw->xfeatures. * user-space unmaps parts of the sigrame fpu buffer so that not all of the buffer required by xrstor is accessible. In this case, xrstor tries to restore and accesses the unmapped area which results in a fault. But fault_in_readable succeeds because buf + fx_sw->xstate_size is within the still mapped area, so it goes back and tries xrstor again. It will spin in this loop forever. Instead, fault in the maximum size which can be touched by XRSTOR (taken from fpstate->user_size). [ dhansen: tweak subject / changelog ]
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=5.14.0<5.15.150 | |
| Linux Kernel | >=5.16.0<6.1.79 | |
| Linux Kernel | >=6.2.0<6.6.18 | |
| Linux Kernel | >=6.7.0<6.7.6 | |
| redhat/kernel | <6.1.79 | 6.1.79 |
| redhat/kernel | <6.6.18 | 6.6.18 |
| redhat/kernel | <6.7.6 | 6.7.6 |
| redhat/kernel | <6.8 | 6.8 |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.129-1 6.1.128-1 6.12.21-1 | |
| IBM Security Verify Governance - Identity Manager | <=ISVG 10.0.2 | |
| IBM Security Verify Governance, Identity Manager Software Stack | <=ISVG 10.0.2 | |
| IBM Security Verify Governance, Identity Manager Virtual Appliance | <=ISVG 10.0.2 | |
| IBM Security Verify Governance Identity Manager Container | <=ISVG 10.0.2 |
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Reference Links
- https://git.kernel.org/stable/c/627339cccdc9166792ecf96bc3c9f711a60ce996
- https://git.kernel.org/stable/c/627e28cbb65564e55008315d9e02fbb90478beda
- https://git.kernel.org/stable/c/b2479ab426cef7ab79a13005650eff956223ced2
- https://git.kernel.org/stable/c/d877550eaf2dc9090d782864c96939397a3c6835
- https://git.kernel.org/stable/c/8bd3eee7720c14b59a206bd05b98d7586bccf99a
- https://launchpad.net/bugs/cve/CVE-2024-26603
- https://access.redhat.com/security/cve/CVE-2024-26603
- https://lore.kernel.org/linux-cve-announce/2024022415-CVE-2024-26603-42c2@gregkh/T/#u
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2265834
- https://access.redhat.com/errata/RHSA-2024:3618
- https://access.redhat.com/errata/RHSA-2024:3627
- https://access.redhat.com/errata/RHSA-2024:9315
- https://access.redhat.com/errata/RHSA-2025:2490
- https://bugzilla.redhat.com/show_bug.cgi?id=2265833
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-26603
- https://nvd.nist.gov/vuln/detail/CVE-2024-26603
- https://security-tracker.debian.org/tracker/CVE-2024-26603
- https://ubuntu.com/security/CVE-2024-26603
- https://git.kernel.org/linus/d877550eaf2dc9090d782864c96939397a3c6835
- https://www.ibm.com/support/pages/node/7230443 (Advisory)
Frequently Asked Questions
What is the severity of CVE-2024-26603?
CVE-2024-26603 is identified as an important-level vulnerability in the Linux kernel.
How do I fix CVE-2024-26603?
To fix CVE-2024-26603, update your Linux kernel to version 6.1.79 or later, or apply the latest patches for your specific distribution.
Which Linux kernel versions are affected by CVE-2024-26603?
CVE-2024-26603 affects Linux kernel versions from 5.14.0 up to 6.1.79.
What components are impacted by CVE-2024-26603?
CVE-2024-26603 affects the x86 floating-point unit (fpu) functionality within the Linux kernel.
Is CVE-2024-26603 a remote or local vulnerability?
CVE-2024-26603 is considered a local vulnerability, requiring an attacker to have local access to exploit.
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