RHSA-2026:1512
Vulnerability from csaf_redhat - Published: 2026-01-28 19:17 - Updated: 2026-01-29 15:24Summary
Red Hat Security Advisory: kernel security update
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: e1000e: fix heap overflow in e1000_set_eeprom (CVE-2025-39898)
* kernel: media: rc: fix races with imon_disconnect() (CVE-2025-39993)
* kernel: ipv6: Fix out-of-bounds access in ipv6_find_tlv() (CVE-2023-53705)
* kernel: Linux kernel: vsock vulnerability may lead to memory corruption (CVE-2025-40248)
* kernel: Linux kernel Bluetooth L2CAP: Kernel crash due to use-after-free via race condition (CVE-2023-53751)
* kernel: drm/vmwgfx: Validate command header size against SVGA_CMD_MAX_DATASIZE (CVE-2025-40277)
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.
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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.",
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"title": "Statement"
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},
{
"category": "external",
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39898"
},
{
"category": "external",
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"url": "https://lore.kernel.org/linux-cve-announce/2025100116-CVE-2025-39898-d844@gregkh/T"
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"category": "vendor_fix",
"date": "2026-01-28T19:17:58+00:00",
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"title": "kernel: e1000e: fix heap overflow in e1000_set_eeprom"
},
{
"cve": "CVE-2025-39993",
"cwe": {
"id": "CWE-416",
"name": "Use After Free"
},
"discovery_date": "2025-10-15T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2404121"
}
],
"notes": [
{
"category": "description",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: rc: fix races with imon_disconnect()\n\nSyzbot reports a KASAN issue as below:\nBUG: KASAN: use-after-free in __create_pipe include/linux/usb.h:1945 [inline]\nBUG: KASAN: use-after-free in send_packet+0xa2d/0xbc0 drivers/media/rc/imon.c:627\nRead of size 4 at addr ffff8880256fb000 by task syz-executor314/4465\n\nCPU: 2 PID: 4465 Comm: syz-executor314 Not tainted 6.0.0-rc1-syzkaller #0\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014\nCall Trace:\n \u003cTASK\u003e\n__dump_stack lib/dump_stack.c:88 [inline]\ndump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106\nprint_address_description mm/kasan/report.c:317 [inline]\nprint_report.cold+0x2ba/0x6e9 mm/kasan/report.c:433\nkasan_report+0xb1/0x1e0 mm/kasan/report.c:495\n__create_pipe include/linux/usb.h:1945 [inline]\nsend_packet+0xa2d/0xbc0 drivers/media/rc/imon.c:627\nvfd_write+0x2d9/0x550 drivers/media/rc/imon.c:991\nvfs_write+0x2d7/0xdd0 fs/read_write.c:576\nksys_write+0x127/0x250 fs/read_write.c:631\ndo_syscall_x64 arch/x86/entry/common.c:50 [inline]\ndo_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\nentry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nThe iMON driver improperly releases the usb_device reference in\nimon_disconnect without coordinating with active users of the\ndevice.\n\nSpecifically, the fields usbdev_intf0 and usbdev_intf1 are not\nprotected by the users counter (ictx-\u003eusers). During probe,\nimon_init_intf0 or imon_init_intf1 increments the usb_device\nreference count depending on the interface. However, during\ndisconnect, usb_put_dev is called unconditionally, regardless of\nactual usage.\n\nAs a result, if vfd_write or other operations are still in\nprogress after disconnect, this can lead to a use-after-free of\nthe usb_device pointer.\n\nThread 1 vfd_write Thread 2 imon_disconnect\n ...\n if\n usb_put_dev(ictx-\u003eusbdev_intf0)\n else\n usb_put_dev(ictx-\u003eusbdev_intf1)\n...\nwhile\n send_packet\n if\n pipe = usb_sndintpipe(\n ictx-\u003eusbdev_intf0) UAF\n else\n pipe = usb_sndctrlpipe(\n ictx-\u003eusbdev_intf0, 0) UAF\n\nGuard access to usbdev_intf0 and usbdev_intf1 after disconnect by\nchecking ictx-\u003edisconnected in all writer paths. Add early return\nwith -ENODEV in send_packet(), vfd_write(), lcd_write() and\ndisplay_open() if the device is no longer present.\n\nSet and read ictx-\u003edisconnected under ictx-\u003elock to ensure memory\nsynchronization. Acquire the lock in imon_disconnect() before setting\nthe flag to synchronize with any ongoing operations.\n\nEnsure writers exit early and safely after disconnect before the USB\ncore proceeds with cleanup.\n\nFound by Linux Verification Center (linuxtesting.org) with Syzkaller.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: media: rc: fix races with imon_disconnect()",
"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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"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39993"
},
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"summary": "https://lore.kernel.org/linux-cve-announce/2025101527-CVE-2025-39993-caef@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025101527-CVE-2025-39993-caef@gregkh/T"
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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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"cwe": {
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"name": "Integer Overflow or Wraparound"
},
"discovery_date": "2025-12-06T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2419954"
}
],
"notes": [
{
"category": "description",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/vmwgfx: Validate command header size against SVGA_CMD_MAX_DATASIZE\n\nThis data originates from userspace and is used in buffer offset\ncalculations which could potentially overflow causing an out-of-bounds\naccess.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: drm/vmwgfx: Validate command header size against SVGA_CMD_MAX_DATASIZE",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "A local attacker with access to the vmwgfx device could trigger an integer overflow when sending crafted SVGA3D command buffers with a malformed header size. The unchecked header-\u003esize field is used in buffer offset arithmetic, leading to potential out-of-bounds memory access in the kernel. The patch enforces a maximum bound (SVGA_CMD_MAX_DATASIZE) to prevent overflows. This issue may allow denial of service or privilege escalation within the guest VM.",
"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"
}
],
"product_status": {
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2025-40277"
},
{
"category": "external",
"summary": "RHBZ#2419954",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2419954"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-40277",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-40277"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-40277",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40277"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025120717-CVE-2025-40277-d511@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025120717-CVE-2025-40277-d511@gregkh/T"
}
],
"release_date": "2025-12-06T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-01-28T19:17:58+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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"restart_required": {
"category": "machine"
},
"url": "https://access.redhat.com/errata/RHSA-2026:1512"
},
{
"category": "workaround",
"details": "To mitigate this issue, prevent module vmwgfx from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.",
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"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
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"details": "Moderate"
}
],
"title": "kernel: drm/vmwgfx: Validate command header size against SVGA_CMD_MAX_DATASIZE"
}
]
}
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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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