RHSA-2026:35904
Vulnerability from csaf_redhat - Published: 2026-07-06 14:33 - Updated: 2026-10-02 09:19Summary
Red Hat Security Advisory: kernel-rt security update
Severity
Important
Notes
Topic: An update for kernel-rt is now available for Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.
Security Fix(es):
* kernel: ima: don't clear IMA_DIGSIG flag when setting or removing non-IMA xattr (CVE-2025-68183)
* kernel: Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold (CVE-2026-31408)
* kernel: tcp: fix potential race in tcp_v6_syn_recv_sock() (CVE-2026-43198)
* kernel: RDMA/vmw_pvrdma: Fix double free on pvrdma_alloc_ucontext() error path (CVE-2026-46189)
* kernel: nvmet-tcp: fix race between ICReq handling and queue teardown (CVE-2026-46135)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
In the Linux kernel, the following vulnerability has been resolved: ima: don't clear IMA_DIGSIG 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 "ima_appraise=fix evm=fix ima_policy=appraise_tcb" 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 IMA_DIGSIG 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 IMA_DIGSIG 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* file_path = "/usr/sbin/test_binary"; const char* hex_string = "030204d33204490066306402304"; int length = strlen(hex_string); char* ima_attr_value; int fd; fd = open(file_path, O_WRONLY|O_CREAT|O_EXCL, 0644); if (fd == -1) { perror("Error opening file"); return 1; } ima_attr_value = (char*)malloc(length / 2 ); for (int i = 0, j = 0; i < length; i += 2, j++) { sscanf(hex_string + i, "%2hhx", &ima_attr_value[j]); } if (fsetxattr(fd, "security.ima", ima_attr_value, length/2, 0) == -1) { perror("Error setting extended attribute"); close(fd); return 1; } const char* selinux_value= "system_u:object_r:bin_t:s0"; if (fsetxattr(fd, "security.selinux", selinux_value, strlen(selinux_value), 0) == -1) { perror("Error setting extended attribute"); close(fd); return 1; } close(fd); return 0; }
7.1 (High)
Affected products
Fixed
34 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-0:5.14.0-284.179.1.rt14.464.el9_2.src | — |
Vendor Fix
fix
|
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| Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-0:5.14.0-284.179.1.rt14.464.el9_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-core-0:5.14.0-284.179.1.rt14.464.el9_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-debug-0:5.14.0-284.179.1.rt14.464.el9_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-debug-core-0:5.14.0-284.179.1.rt14.464.el9_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-debug-debuginfo-0:5.14.0-284.179.1.rt14.464.el9_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-debug-devel-0:5.14.0-284.179.1.rt14.464.el9_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-debug-kvm-0:5.14.0-284.179.1.rt14.464.el9_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-debug-modules-0:5.14.0-284.179.1.rt14.464.el9_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-debug-modules-core-0:5.14.0-284.179.1.rt14.464.el9_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-debug-modules-extra-0:5.14.0-284.179.1.rt14.464.el9_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-debuginfo-0:5.14.0-284.179.1.rt14.464.el9_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-debuginfo-common-x86_64-0:5.14.0-284.179.1.rt14.464.el9_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-devel-0:5.14.0-284.179.1.rt14.464.el9_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-kvm-0:5.14.0-284.179.1.rt14.464.el9_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-modules-0:5.14.0-284.179.1.rt14.464.el9_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-modules-core-0:5.14.0-284.179.1.rt14.464.el9_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-modules-extra-0:5.14.0-284.179.1.rt14.464.el9_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-0:5.14.0-284.179.1.rt14.464.el9_2.src | — |
Vendor Fix
fix
|
|
| Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-0:5.14.0-284.179.1.rt14.464.el9_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-core-0:5.14.0-284.179.1.rt14.464.el9_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-debug-0:5.14.0-284.179.1.rt14.464.el9_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-debug-core-0:5.14.0-284.179.1.rt14.464.el9_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-debug-debuginfo-0:5.14.0-284.179.1.rt14.464.el9_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-debug-devel-0:5.14.0-284.179.1.rt14.464.el9_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-debug-modules-0:5.14.0-284.179.1.rt14.464.el9_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-debug-modules-core-0:5.14.0-284.179.1.rt14.464.el9_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-debug-modules-extra-0:5.14.0-284.179.1.rt14.464.el9_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-debuginfo-0:5.14.0-284.179.1.rt14.464.el9_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-debuginfo-common-x86_64-0:5.14.0-284.179.1.rt14.464.el9_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-devel-0:5.14.0-284.179.1.rt14.464.el9_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-modules-0:5.14.0-284.179.1.rt14.464.el9_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-modules-core-0:5.14.0-284.179.1.rt14.464.el9_2.x86_64 | — |
Vendor Fix
fix
|
|
| Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-modules-extra-0:5.14.0-284.179.1.rt14.464.el9_2.x86_64 | — |
Vendor Fix
fix
|
Threats
Impact
Moderate
A flaw was found in the Linux kernel's Bluetooth SCO (Synchronous Connection-Oriented) protocol implementation. The `sco_recv_frame()` function fails to properly hold a reference to a socket after releasing a lock. This oversight allows a concurrent operation to free the socket while it is still being accessed, leading to a use-after-free vulnerability. A local attacker could potentially exploit this to cause memory corruption or a denial of service.
7.0 (High)
Affected products
Fixed
34 products, the same list as for
CVE-2025-68183
Threats
Impact
Moderate
A flaw was found in the Linux kernel. A race condition exists in the TCP (Transmission Control Protocol) IPv6 (Internet Protocol version 6) socket handling, specifically within the tcp_v6_syn_recv_sock() function. This occurs because a child socket becomes visible in the TCP hash table before its IPv6-specific information is fully initialized. A remote attacker could potentially exploit this timing window, leading to an unstable system state or unexpected behavior, which may result in a denial of service (DoS).
7.0 (High)
Affected products
Fixed
34 products, the same list as for
CVE-2025-68183
Threats
Impact
Important
A flaw was found in the Linux kernel's NVMe over TCP (nvmet-tcp) implementation. A race condition exists between the handling of an Initialization Connection Request (ICReq) and the teardown of a queue. A remote attacker, by sending an ICReq and immediately closing the connection, could trigger a double free vulnerability. This could lead to a denial of service (DoS) due to memory corruption.
7.1 (High)
Affected products
Fixed
34 products, the same list as for
CVE-2025-68183
Threats
Impact
Moderate
A flaw was found in the Linux kernel, specifically within the RDMA (Remote Direct Memory Access) vmw_pvrdma module. This vulnerability is a double free, which means the system attempts to release the same memory resource twice. This can occur in an error handling path within the `pvrdma_alloc_ucontext()` function. Exploiting this flaw could lead to memory corruption or cause the system to become unavailable, resulting in a denial of service (DoS).
7.0 (High)
Affected products
Fixed
34 products, the same list as for
CVE-2025-68183
Threats
Impact
Important
References
33 references
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"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nima: don\u0027t clear IMA_DIGSIG flag when setting or removing non-IMA xattr\n\nCurrently when both IMA and EVM are in fix mode, the IMA signature will\nbe reset to IMA hash if a program first stores IMA signature in\nsecurity.ima and then writes/removes some other security xattr for the\nfile.\n\nFor example, on Fedora, after booting the kernel with \"ima_appraise=fix\nevm=fix ima_policy=appraise_tcb\" and installing rpm-plugin-ima,\ninstalling/reinstalling a package will not make good reference IMA\nsignature generated. Instead IMA hash is generated,\n\n # getfattr -m - -d -e hex /usr/bin/bash\n # file: usr/bin/bash\n security.ima=0x0404...\n\nThis happens because when setting security.selinux, the IMA_DIGSIG flag\nthat had been set early was cleared. As a result, IMA hash is generated\nwhen the file is closed.\n\nSimilarly, IMA signature can be cleared on file close after removing\nsecurity xattr like security.evm or setting/removing ACL.\n\nPrevent replacing the IMA file signature with a file hash, by preventing\nthe IMA_DIGSIG flag from being reset.\n\nHere\u0027s a minimal C reproducer which sets security.selinux as the last\nstep which can also replaced by removing security.evm or setting ACL,\n\n #include \u003cstdio.h\u003e\n #include \u003csys/xattr.h\u003e\n #include \u003cfcntl.h\u003e\n #include \u003cunistd.h\u003e\n #include \u003cstring.h\u003e\n #include \u003cstdlib.h\u003e\n\n int main() {\n const char* file_path = \"/usr/sbin/test_binary\";\n const char* hex_string = \"030204d33204490066306402304\";\n int length = strlen(hex_string);\n char* ima_attr_value;\n int fd;\n\n fd = open(file_path, O_WRONLY|O_CREAT|O_EXCL, 0644);\n if (fd == -1) {\n perror(\"Error opening file\");\n return 1;\n }\n\n ima_attr_value = (char*)malloc(length / 2 );\n for (int i = 0, j = 0; i \u003c length; i += 2, j++) {\n sscanf(hex_string + i, \"%2hhx\", \u0026ima_attr_value[j]);\n }\n\n if (fsetxattr(fd, \"security.ima\", ima_attr_value, length/2, 0) == -1) {\n perror(\"Error setting extended attribute\");\n close(fd);\n return 1;\n }\n\n const char* selinux_value= \"system_u:object_r:bin_t:s0\";\n if (fsetxattr(fd, \"security.selinux\", selinux_value, strlen(selinux_value), 0) == -1) {\n perror(\"Error setting extended attribute\");\n close(fd);\n return 1;\n }\n\n close(fd);\n\n return 0;\n }",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: ima: don\u0027t clear IMA_DIGSIG flag when setting or removing non-IMA xattr",
"title": "Vulnerability summary"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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{
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"text": "A flaw was found in the Linux kernel\u0027s Bluetooth SCO (Synchronous Connection-Oriented) protocol implementation. The `sco_recv_frame()` function fails to properly hold a reference to a socket after releasing a lock. This oversight allows a concurrent operation to free the socket while it is still being accessed, leading to a use-after-free vulnerability. A local attacker could potentially exploit this to cause memory corruption or a denial of service.",
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{
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"text": "Under `sco_conn_lock`, the code read `conn-\u003esk` then dropped the lock without `sco_sock_hold()`, so `close()` could race and free the socket before `sk-\u003esk_state` use. The fix mirrors other SCO helpers. Adjacent Bluetooth is involved; impact is UAF and likely crash.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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},
"url": "https://access.redhat.com/errata/RHSA-2026:35904"
},
{
"category": "workaround",
"details": "To mitigate this issue, prevent the `vmw_pvrdma` kernel module from loading. Create a file named `/etc/modprobe.d/disable-vmw_pvrdma.conf` with the following content: `install vmw_pvrdma /bin/true`. A system reboot is required for this change to take effect. Disabling this module may impact functionality if VMware paravirtual RDMA devices are actively used.",
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"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
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"title": "kernel: RDMA/vmw_pvrdma: Fix double free on pvrdma_alloc_ucontext() error path"
}
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}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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