Loop with Unreachable Exit Condition ('Infinite Loop') Affecting kernel-debuginfo-common-aarch64 package, versions <0:4.18.0-553.5.1.el8_10
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Test your applications- Snyk ID SNYK-ROCKY8-KERNELDEBUGINFOCOMMONAARCH64-7264210
- published 15 Jun 2024
- disclosed 26 Feb 2024
Introduced: 26 Feb 2024
CVE-2024-26603 Open this link in a new tabHow to fix?
Upgrade Rocky-Linux:8 kernel-debuginfo-common-aarch64 to version 0:4.18.0-553.5.1.el8_10 or higher.
This issue was patched in RLSA-2024:3618.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-debuginfo-common-aarch64 package and not the kernel-debuginfo-common-aarch64 package as distributed by Rocky-Linux.
See How to fix? for Rocky-Linux:8 relevant fixed versions and status.
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 ]
References
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-26603
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/EZOU3745CWCDZ7EMKMXB2OEEIB5Q3IWM/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OX4EWCYDZRTOEMC2C6OF7ZACAP23SUB5/
- https://git.kernel.org/stable/c/627339cccdc9166792ecf96bc3c9f711a60ce996
- https://git.kernel.org/stable/c/627e28cbb65564e55008315d9e02fbb90478beda
- https://git.kernel.org/stable/c/8bd3eee7720c14b59a206bd05b98d7586bccf99a
- https://git.kernel.org/stable/c/b2479ab426cef7ab79a13005650eff956223ced2
- https://git.kernel.org/stable/c/d877550eaf2dc9090d782864c96939397a3c6835