CVE-2025-68183: ima: don't clear IMA_DIGSIG flag when setting or removing non-IMA xattr
In the Linux kernel, the following vulnerability has been resolved:
ima: don't clear IMADIGSIG flag when setting or removing non-IMA xattr
Currently when both IMA and EVM are in fix mode, the IMA signature will be reset to IMA hash if a program first stores IMA signature in security.ima and then writes/removes some other security xattr for the file.
For example, on Fedora, after booting the kernel with "imaappraise=fix evm=fix imapolicy=appraisetcb" and installing rpm-plugin-ima, installing/reinstalling a package will not make good reference IMA signature generated. Instead IMA hash is generated,
# getfattr -m - -d -e hex /usr/bin/bash # file: usr/bin/bash security.ima=0x0404...
This happens because when setting security.selinux, the IMADIGSIG flag that had been set early was cleared. As a result, IMA hash is generated when the file is closed.
Similarly, IMA signature can be cleared on file close after removing security xattr like security.evm or setting/removing ACL.
Prevent replacing the IMA file signature with a file hash, by preventing the IMADIGSIG flag from being reset.
Here's a minimal C reproducer which sets security.selinux as the last step which can also replaced by removing security.evm or setting ACL,
#include <stdio.h> #include <sys/xattr.h> #include <fcntl.h> #include <unistd.h> #include <string.h> #include <stdlib.h>
int main() { const char filepath = "/usr/sbin/testbinary"; const char hexstring = "030204d33204490066306402304"; int length = strlen(hexstring); char imaattrvalue; int fd;
fd = open(filepath, OWRONLY|OCREAT|OEXCL, 0644); if (fd == -1) { perror("Error opening file"); return 1; }
imaattrvalue = (char)malloc(length / 2 ); for (int i = 0, j = 0; i < length; i += 2, j++) { sscanf(hexstring + i, "%2hhx", &imaattrvalue[j]); }
if (fsetxattr(fd, "security.ima", imaattrvalue, length/2, 0) == -1) { perror("Error setting extended attribute"); close(fd); return 1; }
const char selinuxvalue= "systemu:objectr:bint:s0"; if (fsetxattr(fd, "security.selinux", selinuxvalue, strlen(selinuxvalue), 0) == -1) { perror("Error setting extended attribute"); close(fd); return 1; }
close(fd);
return 0; }
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
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debian/linuxto a version that resolves this vulnerability.Fixed in 6.12.63-1 - Upgrade
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debian/linuxto a version that resolves this vulnerability.Fixed in 6.17.8-1 - Upgrade
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linux/Kernelto a version that resolves this vulnerability.Fixed in 6.1.191 - Upgrade
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linux/Kernelto a version that resolves this vulnerability.Fixed in 6.6.117 - Upgrade
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linux/Kernelto a version that resolves this vulnerability.Fixed in 6.12.58 - Upgrade
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linux/Kernelto a version that resolves this vulnerability.Fixed in 6.17.8 - Upgrade
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debian/linuxto a version that resolves this vulnerability.Fixed in 6.12.107-1Fixed in 6.12.115-2Fixed in 7.2.12-1Fixed in 7.2.15-1 - Upgrade
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ubuntu/linux-aws-6.8to a version that resolves this vulnerability.Fixed in 6.8.0-1050.53~22.04.1 - Upgrade
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ubuntu/linux-azure-6.8to a version that resolves this vulnerability.Fixed in 6.8.0-1051.57~22.04.1 - Upgrade
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ubuntu/linux-lowlatency-hwe-6.8to a version that resolves this vulnerability.Fixed in 6.8.0-106.106.1~22.04.1 - Upgrade
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ubuntu/linux-realtime-6.8to a version that resolves this vulnerability.Fixed in 6.8.1-1045.46~22.04.1 - Upgrade
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ubuntu/linuxto a version that resolves this vulnerability.Fixed in 6.8.0-106.106 - Upgrade
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ubuntu/linux-awsto a version that resolves this vulnerability.Fixed in 6.8.0-1050.53 - Upgrade
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ubuntu/linux-aws-6.17to a version that resolves this vulnerability.Fixed in 6.17.0-1007.7~24.04.1 - Upgrade
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ubuntu/linux-azureto a version that resolves this vulnerability.Fixed in 6.8.0-1051.57 - Upgrade
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ubuntu/linux-gcpto a version that resolves this vulnerability.Fixed in 6.8.0-1052.55 - Upgrade
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ubuntu/linux-gcp-6.17to a version that resolves this vulnerability.Fixed in 6.17.0-1008.8~24.04.1 - Upgrade
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ubuntu/linux-gketo a version that resolves this vulnerability.Fixed in 6.8.0-1048.53 - Upgrade
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ubuntu/linux-lowlatencyto a version that resolves this vulnerability.Fixed in 6.8.0-106.106.1 - Upgrade
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ubuntu/linux-nvidiato a version that resolves this vulnerability.Fixed in 6.8.0-1049.52 - Upgrade
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ubuntu/linux-nvidia-6.17to a version that resolves this vulnerability.Fixed in 6.17.0-1008.8 - Upgrade
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ubuntu/linux-nvidia-lowlatencyto a version that resolves this vulnerability.Fixed in 6.8.0-1049.52.1 - Upgrade
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ubuntu/linux-nvidia-tegrato a version that resolves this vulnerability.Fixed in 6.8.0-1020.20 - Upgrade
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ubuntu/linux-oem-6.17to a version that resolves this vulnerability.Fixed in 6.17.0-1011.11 - Upgrade
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ubuntu/linux-oracleto a version that resolves this vulnerability.Fixed in 6.8.0-1047.48 - Upgrade
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ubuntu/linux-oracle-6.17to a version that resolves this vulnerability.Fixed in 6.17.0-1007.7~24.04.1 - Upgrade
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ubuntu/linux-raspito a version that resolves this vulnerability.Fixed in 6.8.0-1050.54 - Upgrade
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ubuntu/linux-realtimeto a version that resolves this vulnerability.Fixed in 6.8.1-1045.46 - Upgrade
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ubuntu/linux-realtime-6.17to a version that resolves this vulnerability.Fixed in 6.17.0-1006.7~24.04.1 - Upgrade
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ubuntu/linux-aws-fipsto a version that resolves this vulnerability.Fixed in 6.8.0-1050.53+fips1 - Upgrade
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ubuntu/linux-gcp-fipsto a version that resolves this vulnerability.Fixed in 6.8.0-1052.55+fips1 - Upgrade
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ubuntu/linuxto a version that resolves this vulnerability.Fixed in 6.17.0-14.14 - Upgrade
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ubuntu/linux-awsto a version that resolves this vulnerability.Fixed in 6.17.0-1007.7 - Upgrade
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ubuntu/linux-azureto a version that resolves this vulnerability.Fixed in 6.17.0-1008.8 - Upgrade
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ubuntu/linux-gcpto a version that resolves this vulnerability.Fixed in 6.17.0-1007.7 - Upgrade
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ubuntu/linux-oracleto a version that resolves this vulnerability.Fixed in 6.17.0-1007.7 - Upgrade
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ubuntu/linux-raspito a version that resolves this vulnerability.Fixed in 6.17.0-1008.8 - Upgrade
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ubuntu/linux-realtimeto a version that resolves this vulnerability.Fixed in 6.17.0-1006.7 - Upgrade
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ubuntu/linux-riscvto a version that resolves this vulnerability.Fixed in 6.17.0-14.14.1
Event History
Frequently Asked Questions
What is the severity of CVE-2025-68183?
The severity of CVE-2025-68183 is classified as medium, indicating potential impact without immediate exploitability.
How do I fix CVE-2025-68183?
To fix CVE-2025-68183, update your Linux kernel to the latest version where the vulnerability has been patched.
What type of systems are affected by CVE-2025-68183?
CVE-2025-68183 affects the Linux kernel, particularly systems relying on IMA and EVM functionalities.
What exploitation risks are associated with CVE-2025-68183?
Exploitation of CVE-2025-68183 could allow unauthorized manipulation of IMA signatures, potentially compromising system integrity.
Is CVE-2025-68183 related to other vulnerabilities?
Yes, CVE-2025-68183 relates to vulnerabilities involving the Integrated Measurement Architecture (IMA) and integrity verification mechanisms.