RHSA-2026:3375

Vulnerability from csaf_redhat - Published: 2026-02-25 19:01 - Updated: 2026-03-12 19:03
Summary
Red Hat Security Advisory: kernel-rt security update
Severity
Moderate
Notes
Topic: An update for kernel-rt is now available for Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions. Red Hat Product Security has rated this update as having a security impact of Moderate. 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: RDMA/core: Fix "KASAN: slab-use-after-free Read in ib_register_device" problem (CVE-2025-38022) * kernel: Linux kernel: Memory corruption in Squashfs due to incorrect block size calculation (CVE-2025-38415) * kernel: Linux kernel: Denial of Service via out-of-bounds read in USB configuration parsing (CVE-2025-39760) * kernel: smb: client: let recv_done verify data_offset, data_length and remaining_data_length (CVE-2025-39933) * kernel: Linux kernel: Use-after-free in proc_readdir_de() can lead to privilege escalation or denial of service. (CVE-2025-40271) * kernel: Linux kernel ALSA USB audio driver: Buffer overflow leading to information disclosure and denial of service (CVE-2025-40269) * kernel: ip6_vti: fix slab-use-after-free in decode_session6 (CVE-2023-53821) * kernel: NFSv4/pNFS: Clear NFS_INO_LAYOUTCOMMIT in pnfs_mark_layout_stateid_invalid (CVE-2025-68349) 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.
CVE-2023-53821

A use-after-free vulnerability was found in the IPv6 VTI (Virtual Tunnel Interface) implementation in the Linux kernel. When an IPv6 VTI device uses the SFB (Stochastic Fair Blue) qdisc, the control block (cb) field of an skb can be modified during packet enqueuing. The decode_session6() function then reads from this modified cb field, accessing freed memory (IP6CB(skb)->nhoff was not set for transmit path). This can lead to kernel crashes or potentially arbitrary code execution.

7.0 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-825 - Expired Pointer Dereference
Vendor Fix For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. https://access.redhat.com/errata/RHSA-2026:3375
CVE-2025-38022

In the Linux kernel, the following vulnerability has been resolved: RDMA/core: Fix "KASAN: slab-use-after-free Read in ib_register_device" problem Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:408 [inline] print_report+0xc3/0x670 mm/kasan/report.c:521 kasan_report+0xe0/0x110 mm/kasan/report.c:634 strlen+0x93/0xa0 lib/string.c:420 __fortify_strlen include/linux/fortify-string.h:268 [inline] get_kobj_path_length lib/kobject.c:118 [inline] kobject_get_path+0x3f/0x2a0 lib/kobject.c:158 kobject_uevent_env+0x289/0x1870 lib/kobject_uevent.c:545 ib_register_device drivers/infiniband/core/device.c:1472 [inline] ib_register_device+0x8cf/0xe00 drivers/infiniband/core/device.c:1393 rxe_register_device+0x275/0x320 drivers/infiniband/sw/rxe/rxe_verbs.c:1552 rxe_net_add+0x8e/0xe0 drivers/infiniband/sw/rxe/rxe_net.c:550 rxe_newlink+0x70/0x190 drivers/infiniband/sw/rxe/rxe.c:225 nldev_newlink+0x3a3/0x680 drivers/infiniband/core/nldev.c:1796 rdma_nl_rcv_msg+0x387/0x6e0 drivers/infiniband/core/netlink.c:195 rdma_nl_rcv_skb.constprop.0.isra.0+0x2e5/0x450 netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline] netlink_unicast+0x53a/0x7f0 net/netlink/af_netlink.c:1339 netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg net/socket.c:727 [inline] ____sys_sendmsg+0xa95/0xc70 net/socket.c:2566 ___sys_sendmsg+0x134/0x1d0 net/socket.c:2620 __sys_sendmsg+0x16d/0x220 net/socket.c:2652 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f This problem is similar to the problem that the commit 1d6a9e7449e2 ("RDMA/core: Fix use-after-free when rename device name") fixes. The root cause is: the function ib_device_rename() renames the name with lock. But in the function kobject_uevent(), this name is accessed without lock protection at the same time. The solution is to add the lock protection when this name is accessed in the function kobject_uevent().

7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CWE-125 - Out-of-bounds Read
Vendor Fix For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. https://access.redhat.com/errata/RHSA-2026:3375
CVE-2025-38415

A flaw was found in the Linux kernel's Squashfs filesystem. A local attacker can exploit this vulnerability by simultaneously mounting a Squashfs filesystem and issuing a specific input/output control (ioctl) command. This can lead to an incorrect block size calculation, causing a shift-out-of-bounds error. This memory corruption vulnerability can result in a denial of service or potentially lead to more severe system compromise.

7.0 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-252 - Unchecked Return Value
Vendor Fix For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. https://access.redhat.com/errata/RHSA-2026:3375
CVE-2025-39760

A flaw was found in the Linux kernel's USB core configuration parsing. Specifically, the `usb_parse_ss_endpoint_companion()` function incorrectly checks the descriptor type before its length, which can lead to reading data beyond the intended buffer. This out-of-bounds read vulnerability could allow a local attacker to cause a system crash, resulting in a Denial of Service (DoS).

7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CWE-125 - Out-of-bounds Read
Vendor Fix For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. https://access.redhat.com/errata/RHSA-2026:3375
Workaround Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
CVE-2025-39933

In the Linux kernel, the following vulnerability has been resolved: smb: client: let recv_done verify data_offset, data_length and remaining_data_length This is inspired by the related server fixes.

7.1 (High)
CVSS:3.1/AV:A/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-787 - Out-of-bounds Write
Vendor Fix For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. https://access.redhat.com/errata/RHSA-2026:3375
CVE-2025-40269

A flaw was found in the ALSA USB audio driver of the Linux kernel. This vulnerability, a buffer overflow, occurs when the size of the Pulse-Code Modulation (PCM) stream data packets exceeds the maximum allowed by the USB descriptor. A local attacker could exploit this by providing specially crafted USB audio device parameters, causing the PCM transfer buffer to overflow. This could lead to sensitive information disclosure and potentially result in a denial of service (DoS).

7.3 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H
CWE-131 - Incorrect Calculation of Buffer Size
Vendor Fix For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. https://access.redhat.com/errata/RHSA-2026:3375
Workaround To mitigate this issue, prevent the `snd_usb_audio` kernel module from loading if USB audio functionality is not required. Create a file `/etc/modprobe.d/disable-snd-usb-audio.conf` with the following content: `install snd_usb_audio /bin/true` After creating the file, a system reboot is required for the changes to take effect. This action will disable all USB audio device functionality.
CVE-2025-40271

A flaw was found in the Linux kernel. This use-after-free (UAF) vulnerability occurs in the `proc_readdir_de()` function within the `/proc` filesystem. A local attacker with low privileges can exploit this by concurrently traversing specific directories while network devices are unregistered. This can lead to a use-after-free condition, potentially resulting in information disclosure, privilege escalation, or a denial of service (DoS).

7.0 (High)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-825 - Expired Pointer Dereference
Vendor Fix For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. https://access.redhat.com/errata/RHSA-2026:3375
Workaround Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
CVE-2025-68349

A flaw null pointer dereference in the Linux kernel NFS functionality was found in the way client does some specific action for existing NFS connection. A client user could use this flaw to crash the server system.

7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE-476 - NULL Pointer Dereference
Vendor Fix For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. https://access.redhat.com/errata/RHSA-2026:3375
Workaround If NFS service not being used, then disable it to prevent possibility of triggering this bug (and usually it is disabled by default): sudo systemctl stop nfs-server sudo systemctl disable nfs-server
References
https://access.redhat.com/errata/RHSA-2026:3375 self
https://access.redhat.com/security/updates/classi… external
https://bugzilla.redhat.com/show_bug.cgi?id=2373326 external
https://bugzilla.redhat.com/show_bug.cgi?id=2383404 external
https://bugzilla.redhat.com/show_bug.cgi?id=2394601 external
https://bugzilla.redhat.com/show_bug.cgi?id=2401432 external
https://bugzilla.redhat.com/show_bug.cgi?id=2419837 external
https://bugzilla.redhat.com/show_bug.cgi?id=2419919 external
https://bugzilla.redhat.com/show_bug.cgi?id=2420329 external
https://bugzilla.redhat.com/show_bug.cgi?id=2424880 external
https://security.access.redhat.com/data/csaf/v2/a… self
https://access.redhat.com/security/cve/CVE-2023-53821 self
https://bugzilla.redhat.com/show_bug.cgi?id=2420329 external
https://www.cve.org/CVERecord?id=CVE-2023-53821 external
https://nvd.nist.gov/vuln/detail/CVE-2023-53821 external
https://lore.kernel.org/linux-cve-announce/202512… external
https://access.redhat.com/security/cve/CVE-2025-38022 self
https://bugzilla.redhat.com/show_bug.cgi?id=2373326 external
https://www.cve.org/CVERecord?id=CVE-2025-38022 external
https://nvd.nist.gov/vuln/detail/CVE-2025-38022 external
https://lore.kernel.org/linux-cve-announce/202506… external
https://access.redhat.com/security/cve/CVE-2025-38415 self
https://bugzilla.redhat.com/show_bug.cgi?id=2383404 external
https://www.cve.org/CVERecord?id=CVE-2025-38415 external
https://nvd.nist.gov/vuln/detail/CVE-2025-38415 external
https://lore.kernel.org/linux-cve-announce/202507… external
https://access.redhat.com/security/cve/CVE-2025-39760 self
https://bugzilla.redhat.com/show_bug.cgi?id=2394601 external
https://www.cve.org/CVERecord?id=CVE-2025-39760 external
https://nvd.nist.gov/vuln/detail/CVE-2025-39760 external
https://lore.kernel.org/linux-cve-announce/202509… external
https://access.redhat.com/security/cve/CVE-2025-39933 self
https://bugzilla.redhat.com/show_bug.cgi?id=2401432 external
https://www.cve.org/CVERecord?id=CVE-2025-39933 external
https://nvd.nist.gov/vuln/detail/CVE-2025-39933 external
https://lore.kernel.org/linux-cve-announce/202510… external
https://access.redhat.com/security/cve/CVE-2025-40269 self
https://bugzilla.redhat.com/show_bug.cgi?id=2419919 external
https://www.cve.org/CVERecord?id=CVE-2025-40269 external
https://nvd.nist.gov/vuln/detail/CVE-2025-40269 external
https://lore.kernel.org/linux-cve-announce/202512… external
https://access.redhat.com/security/cve/CVE-2025-40271 self
https://bugzilla.redhat.com/show_bug.cgi?id=2419837 external
https://www.cve.org/CVERecord?id=CVE-2025-40271 external
https://nvd.nist.gov/vuln/detail/CVE-2025-40271 external
https://lore.kernel.org/linux-cve-announce/202512… external
https://access.redhat.com/security/cve/CVE-2025-68349 self
https://bugzilla.redhat.com/show_bug.cgi?id=2424880 external
https://www.cve.org/CVERecord?id=CVE-2025-68349 external
https://nvd.nist.gov/vuln/detail/CVE-2025-68349 external
https://lore.kernel.org/linux-cve-announce/202512… external
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      "title": "kernel: ip6_vti: fix slab-use-after-free in decode_session6"
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    {
      "cve": "CVE-2025-38022",
      "cwe": {
        "id": "CWE-125",
        "name": "Out-of-bounds Read"
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      "discovery_date": "2025-06-18T00:00:00+00:00",
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          "text": "2373326"
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          "category": "description",
          "text": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/core: Fix \"KASAN: slab-use-after-free Read in ib_register_device\" problem\n\nCall Trace:\n\n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:408 [inline]\n print_report+0xc3/0x670 mm/kasan/report.c:521\n kasan_report+0xe0/0x110 mm/kasan/report.c:634\n strlen+0x93/0xa0 lib/string.c:420\n __fortify_strlen include/linux/fortify-string.h:268 [inline]\n get_kobj_path_length lib/kobject.c:118 [inline]\n kobject_get_path+0x3f/0x2a0 lib/kobject.c:158\n kobject_uevent_env+0x289/0x1870 lib/kobject_uevent.c:545\n ib_register_device drivers/infiniband/core/device.c:1472 [inline]\n ib_register_device+0x8cf/0xe00 drivers/infiniband/core/device.c:1393\n rxe_register_device+0x275/0x320 drivers/infiniband/sw/rxe/rxe_verbs.c:1552\n rxe_net_add+0x8e/0xe0 drivers/infiniband/sw/rxe/rxe_net.c:550\n rxe_newlink+0x70/0x190 drivers/infiniband/sw/rxe/rxe.c:225\n nldev_newlink+0x3a3/0x680 drivers/infiniband/core/nldev.c:1796\n rdma_nl_rcv_msg+0x387/0x6e0 drivers/infiniband/core/netlink.c:195\n rdma_nl_rcv_skb.constprop.0.isra.0+0x2e5/0x450\n netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]\n netlink_unicast+0x53a/0x7f0 net/netlink/af_netlink.c:1339\n netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1883\n sock_sendmsg_nosec net/socket.c:712 [inline]\n __sock_sendmsg net/socket.c:727 [inline]\n ____sys_sendmsg+0xa95/0xc70 net/socket.c:2566\n ___sys_sendmsg+0x134/0x1d0 net/socket.c:2620\n __sys_sendmsg+0x16d/0x220 net/socket.c:2652\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nThis problem is similar to the problem that the\ncommit 1d6a9e7449e2 (\"RDMA/core: Fix use-after-free when rename device name\")\nfixes.\n\nThe root cause is: the function ib_device_rename() renames the name with\nlock. But in the function kobject_uevent(), this name is accessed without\nlock protection at the same time.\n\nThe solution is to add the lock protection when this name is accessed in\nthe function kobject_uevent().",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: RDMA/core: Fix \"KASAN: slab-use-after-free Read in ib_register_device\" problem",
          "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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          "title": "Statement"
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          "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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          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2025-68349"
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          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2424880"
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          "summary": "https://www.cve.org/CVERecord?id=CVE-2025-68349",
          "url": "https://www.cve.org/CVERecord?id=CVE-2025-68349"
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          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-68349",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-68349"
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          "summary": "https://lore.kernel.org/linux-cve-announce/2025122453-CVE-2025-68349-12d5@gregkh/T",
          "url": "https://lore.kernel.org/linux-cve-announce/2025122453-CVE-2025-68349-12d5@gregkh/T"
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      "title": "kernel: NFSv4/pNFS: Clear NFS_INO_LAYOUTCOMMIT in pnfs_mark_layout_stateid_invalid"
    }
  ]
}


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Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

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.



Detection rules are retrieved from Rulezet.