RHSA-2026:3388
Vulnerability from csaf_redhat - Published: 2026-02-26 04:25 - Updated: 2026-03-12 19:03Summary
Red Hat Security Advisory: kernel security update
Severity
Important
Notes
Topic: An update for kernel is now available for Red Hat Enterprise Linux 8.2 Advanced Update Support.
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 packages contain the Linux kernel, the core of any Linux operating system.
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 in ATM CLIP module via infinite recursion (CVE-2025-38459)
* kernel: Linux kernel: Denial of Service via out-of-bounds read in USB configuration parsing (CVE-2025-39760)
* kernel: nbd: fix incomplete validation of ioctl arg (CVE-2023-53513)
* kernel: Linux kernel: Use-after-free in proc_readdir_de() can lead to privilege escalation or denial of service. (CVE-2025-40271)
* kernel: ip6_vti: fix slab-use-after-free in decode_session6 (CVE-2023-53821)
* kernel: Bluetooth: L2CAP: Fix use-after-free in l2cap_disconnect_{req,rsp} (CVE-2023-53827)
* kernel: tcp: fix a signed-integer-overflow bug in tcp_add_backlog() (CVE-2022-50865)
* kernel: Linux kernel: Use-after-free in teql queueing discipline can lead to privilege escalation (CVE-2026-23074)
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.
A flaw was found in the Linux kernel’s TCP implementation in the function tcp_add_backlog(). When calculating the maximum acceptable backlog for TCP sockets, the sum of the receive buffer (sk_rcvbuf), the send buffer (sk_sndbuf), and a fixed constant may exceed the maximum value of a signed integer due to both buffer values being of type int. This can result in a signed integer overflow, potentially leading to incorrect backlog limits and unexpected TCP behavior under certain workloads.
7.5 (High)
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-2026:3388
Workaround
Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
A flaw has been found in the Linux kernel’s NBD drivers.The issue stems from incomplete validation of IOCTL arguments passed to the NBD driver. Specifically, oversized or unchecked arguments may lead to a signed integer overflow in __block_write_full_page() and misuse of argument values cast to int in nbd_add_socket().
7.3 (High)
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-2026:3388
Workaround
Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
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)
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-2026:3388
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix use-after-free in l2cap_disconnect_{req,rsp} Similar to commit d0be8347c623 ("Bluetooth: L2CAP: Fix use-after-free caused by l2cap_chan_put"), just use l2cap_chan_hold_unless_zero to prevent referencing a channel that is about to be destroyed.
7.5 (High)
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-2026:3388
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)
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-2026:3388
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)
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-2026:3388
A flaw was found in the Linux kernel's Asynchronous Transfer Mode (ATM) Classical IP (CLIP) module. A local user can trigger an infinite recursive call in the `clip_push()` function by repeatedly calling the `ioctl(ATMARP_MKIP)` system call. This vulnerability occurs when the socket is closed, leading to stack exhaustion and a kernel crash, resulting in a Denial of Service (DoS).
7.0 (High)
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-2026:3388
Workaround
Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
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)
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-2026:3388
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.
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)
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-2026:3388
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.
A flaw was found in the Linux kernel's networking component. A local attacker with low privileges could exploit a design issue in the teql queueing discipline, which is responsible for managing network traffic. By sending specially crafted network packets, an attacker could trigger a use-after-free (UAF) vulnerability, which is a type of memory corruption. This could lead to a system crash, or potentially allow the attacker to execute unauthorized code or gain elevated system access.
7.0 (High)
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-2026:3388
References
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"name": "Integer Overflow or Wraparound"
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"category": "description",
"text": "A flaw was found in the Linux kernel\u2019s TCP implementation in the function tcp_add_backlog(). When calculating the maximum acceptable backlog for TCP sockets, the sum of the receive buffer (sk_rcvbuf), the send buffer (sk_sndbuf), and a fixed constant may exceed the maximum value of a signed integer due to both buffer values being of type int. This can result in a signed integer overflow, potentially leading to incorrect backlog limits and unexpected TCP behavior under certain workloads.",
"title": "Vulnerability description"
},
{
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"text": "kernel: tcp: fix a signed-integer-overflow bug in tcp_add_backlog()",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "A signed integer overflow in tcp_add_backlog() could occur when computing the backlog limit from sk_rcvbuf and sk_sndbuf, potentially resulting in an incorrect, reduced limit. A remote peer can trigger this condition by sending network traffic that stresses the TCP backlog, leading to premature packet drops and degraded service availability.\nThis issue is a typical network robustness bug, as the integer overflow only affects internal backlog limit calculations and can at most cause packet drops or limited service degradation (DoS), without providing a realistic path to host crashes, memory corruption, privilege escalation, or code execution.",
"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.",
"title": "CVSS score applicability"
}
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"title": "Statement"
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{
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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.",
"title": "CVSS score applicability"
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"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Fix use-after-free in l2cap_disconnect_{req,rsp}\n\nSimilar to commit d0be8347c623 (\"Bluetooth: L2CAP: Fix use-after-free\ncaused by l2cap_chan_put\"), just use l2cap_chan_hold_unless_zero to\nprevent referencing a channel that is about to be destroyed.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: Bluetooth: L2CAP: Fix use-after-free in l2cap_disconnect_{req,rsp}",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "A race in the L2CAP disconnect request/response handlers could access a channel that is being destroyed, causing a use-after-free and kernel crash. The fix uses l2cap_chan_hold_unless_zero() and proper locking around channel deletion to avoid referencing freed objects. An adjacent attacker over Bluetooth can trigger this during disconnect handling on an active link. Likely only denial-of-service kind of attack possible, but cannot prove this.\nThe complexity of attack is high, because it requires a precise race condition between the local channel teardown (triggered by the kernel) and a crafted L2CAP_DisconnectReq or L2CAP_DisconnectRsp message sent by the remote peer at exactly the same time. The timing window is very narrow \u2014 the attacker must send or respond to the disconnect while the kernel is already in the process of releasing the l2cap_chan structure but before the reference count reaches zero. Achieving this reliably would require repeated connect/disconnect cycles or fuzzing at the signaling layer, making stable exploitation unlikely outside of a controlled test setup.",
"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.",
"title": "CVSS score applicability"
}
],
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},
{
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"url": "https://lore.kernel.org/linux-cve-announce/2025120952-CVE-2023-53827-b045@gregkh/T"
}
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{
"category": "vendor_fix",
"date": "2026-02-26T04:25:43+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
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"title": "kernel: Bluetooth: L2CAP: Fix use-after-free in l2cap_disconnect_{req,rsp}"
},
{
"cve": "CVE-2025-38022",
"cwe": {
"id": "CWE-125",
"name": "Out-of-bounds Read"
},
"discovery_date": "2025-06-18T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2373326"
}
],
"notes": [
{
"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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"summary": "https://www.cve.org/CVERecord?id=CVE-2025-38022",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-38022"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-38022",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-38022"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025061846-CVE-2025-38022-41b3@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025061846-CVE-2025-38022-41b3@gregkh/T"
}
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"text": "kernel: Linux kernel: Use-after-free in proc_readdir_de() can lead to privilege escalation or denial of service.",
"title": "Vulnerability summary"
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"title": "Statement"
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{
"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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"url": "https://lore.kernel.org/linux-cve-announce/2025120716-CVE-2025-40271-7612@gregkh/T"
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"details": "Moderate"
}
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"title": "kernel: Linux kernel: Use-after-free in proc_readdir_de() can lead to privilege escalation or denial of service."
},
{
"cve": "CVE-2026-23074",
"cwe": {
"id": "CWE-825",
"name": "Expired Pointer Dereference"
},
"discovery_date": "2026-02-04T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2436791"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the Linux kernel\u0027s networking component. A local attacker with low privileges could exploit a design issue in the teql queueing discipline, which is responsible for managing network traffic. By sending specially crafted network packets, an attacker could trigger a use-after-free (UAF) vulnerability, which is a type of memory corruption. This could lead to a system crash, or potentially allow the attacker to execute unauthorized code or gain elevated system access.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: Linux kernel: Use-after-free in teql queueing discipline can lead to privilege escalation",
"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"
}
],
"product_status": {
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-23074"
},
{
"category": "external",
"summary": "RHBZ#2436791",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2436791"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-23074",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-23074"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-23074",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-23074"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2026020419-CVE-2026-23074-6bb8@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2026020419-CVE-2026-23074-6bb8@gregkh/T"
}
],
"release_date": "2026-02-04T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-02-26T04:25:43+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258\n\nThe system must be rebooted for this update to take effect.",
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"availabilityImpact": "HIGH",
"baseScore": 7.0,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"threats": [
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}
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"title": "kernel: Linux kernel: Use-after-free in teql queueing discipline can lead to privilege escalation"
}
]
}
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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.
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