rhsa-2025:22124
Vulnerability from csaf_redhat
Published
2025-11-25 18:17
Modified
2025-11-25 21:29
Summary
Red Hat Security Advisory: kernel-rt security update
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 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: net/sched: act_ct: fix skb leak and crash on ooo frags (CVE-2023-52610)
* kernel: smb: client: fix potential UAF in cifs_stats_proc_write() (CVE-2024-35868)
* kernel: ethtool: check device is present when getting link settings (CVE-2024-46679)
* kernel: ALSA: usb-audio: Validate UAC3 power domain descriptors, too (CVE-2025-38729)
* kernel: ipv6: sr: Fix MAC comparison to be constant-time (CVE-2025-39702)
* kernel: NFS: Fix filehandle bounds checking in nfs_fh_to_dentry() (CVE-2025-39730)
* kernel: ALSA: usb-audio: Validate UAC3 cluster segment descriptors (CVE-2025-39757)
* kernel: x86/vmscape: Add conditional IBPB mitigation (CVE-2025-40300)
* kernel: wifi: mac80211: check S1G action frame size (CVE-2023-53257)
* kernel: Bluetooth: L2CAP: fix "bad unlock balance" in l2cap_disconnect_rsp (CVE-2023-53297)
* kernel: efivarfs: Fix slab-out-of-bounds in efivarfs_d_compare (CVE-2025-39817)
* kernel: ip6mr: Fix skb_under_panic in ip6mr_cache_report() (CVE-2023-53365)
* kernel: Bluetooth: L2CAP: Fix user-after-free (CVE-2022-50386)
* kernel: nbd: fix incomplete validation of ioctl arg (CVE-2023-53513)
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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"cve": "CVE-2022-50386",
"discovery_date": "2025-09-18T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2396431"
}
],
"notes": [
{
"category": "description",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: L2CAP: Fix user-after-free\n\nThis uses l2cap_chan_hold_unless_zero() after calling\n__l2cap_get_chan_blah() to prevent the following trace:\n\nBluetooth: l2cap_core.c:static void l2cap_chan_destroy(struct kref\n*kref)\nBluetooth: chan 0000000023c4974d\nBluetooth: parent 00000000ae861c08\n==================================================================\nBUG: KASAN: use-after-free in __mutex_waiter_is_first\nkernel/locking/mutex.c:191 [inline]\nBUG: KASAN: use-after-free in __mutex_lock_common\nkernel/locking/mutex.c:671 [inline]\nBUG: KASAN: use-after-free in __mutex_lock+0x278/0x400\nkernel/locking/mutex.c:729\nRead of size 8 at addr ffff888006a49b08 by task kworker/u3:2/389",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: Bluetooth: L2CAP: Fix user-after-free",
"title": "Vulnerability summary"
},
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"text": "A use-after-free in the Bluetooth L2CAP subsystem could occur when handling channel responses in l2cap_connect_create_rsp(), due to missing reference checks. This condition can be triggered during race conditions between channel creation and teardown, leading to kernel crashes. Exploitation is most practical as a local or adjacent denial of service over Bluetooth.\n\nL2CAP underpins many Bluetooth profiles and services (BLE ATT/GATT, RFCOMM, A2DP/AVRCP, HID, PAN, SDP, OBEX, etc.). Any profile that creates logical L2CAP channels may be involved. Common real-world triggers include BLE GATT interactions, audio profiles, HID devices, and tethering/PAN connections.\n\nAn attacker within radio range can attempt to repeatedly open/close or otherwise race L2CAP channels to increase likelihood of the race (fast connect/disconnect storms or parallel requests).\n\nMost realistic impact is a local/adjacent attacker (in Bluetooth radio range) who can actively interact with the target Bluetooth stack.\n\nThe CIA=HHH for CVSS is a conservative/precautionary assessment. In practical terms, successful privilege escalation or remote compromise is unlikely but theoretically possible: to do so an attacker would need to craft a sequence that causes controlled memory corruption and further exploit kernel memory layout \u2014 substantially harder than causing a 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.",
"title": "CVSS score applicability"
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{
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{
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{
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{
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"text": "A memory leak flaw and potential kernel crash were found in the Linux kernel\u2019s Conntrack module. This issue occurs when Conntrack is being used by a local user for a specific configuration, and both fragmented packets are received remotely and out of order. This flaw allows a local or remote user to crash or potentially escalate their privileges on the system.",
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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.",
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"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nwifi: mac80211: check S1G action frame size\n\nBefore checking the action code, check that it even\nexists in the frame.",
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{
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"text": "kernel: wifi: mac80211: check S1G action frame size",
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"text": "Exploitable by an RF-adjacent attacker via malformed 802.11ah (S1G) action frames. No local privileges required. Impact is limited to potential denial-of-service from a kernel crash. Not applicable where 802.11ah/S1G is not in use.\nFixed starting from the Red Hat Enterprise Linux 9.4.",
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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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{
"category": "external",
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"title": "kernel: Bluetooth: L2CAP: fix \"bad unlock balance\" in l2cap_disconnect_rsp"
},
{
"cve": "CVE-2023-53365",
"cwe": {
"id": "CWE-124",
"name": "Buffer Underwrite (\u0027Buffer Underflow\u0027)"
},
"discovery_date": "2025-09-17T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2396130"
}
],
"notes": [
{
"category": "description",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nip6mr: Fix skb_under_panic in ip6mr_cache_report()\n\nskbuff: skb_under_panic: text:ffffffff88771f69 len:56 put:-4\n head:ffff88805f86a800 data:ffff887f5f86a850 tail:0x88 end:0x2c0 dev:pim6reg\n ------------[ cut here ]------------\n kernel BUG at net/core/skbuff.c:192!\n invalid opcode: 0000 [#1] PREEMPT SMP KASAN\n CPU: 2 PID: 22968 Comm: kworker/2:11 Not tainted 6.5.0-rc3-00044-g0a8db05b571a #236\n Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014\n Workqueue: ipv6_addrconf addrconf_dad_work\n RIP: 0010:skb_panic+0x152/0x1d0\n Call Trace:\n \u003cTASK\u003e\n skb_push+0xc4/0xe0\n ip6mr_cache_report+0xd69/0x19b0\n reg_vif_xmit+0x406/0x690\n dev_hard_start_xmit+0x17e/0x6e0\n __dev_queue_xmit+0x2d6a/0x3d20\n vlan_dev_hard_start_xmit+0x3ab/0x5c0\n dev_hard_start_xmit+0x17e/0x6e0\n __dev_queue_xmit+0x2d6a/0x3d20\n neigh_connected_output+0x3ed/0x570\n ip6_finish_output2+0x5b5/0x1950\n ip6_finish_output+0x693/0x11c0\n ip6_output+0x24b/0x880\n NF_HOOK.constprop.0+0xfd/0x530\n ndisc_send_skb+0x9db/0x1400\n ndisc_send_rs+0x12a/0x6c0\n addrconf_dad_completed+0x3c9/0xea0\n addrconf_dad_work+0x849/0x1420\n process_one_work+0xa22/0x16e0\n worker_thread+0x679/0x10c0\n ret_from_fork+0x28/0x60\n ret_from_fork_asm+0x11/0x20\n\nWhen setup a vlan device on dev pim6reg, DAD ns packet may sent on reg_vif_xmit().\nreg_vif_xmit()\n ip6mr_cache_report()\n skb_push(skb, -skb_network_offset(pkt));//skb_network_offset(pkt) is 4\nAnd skb_push declared as:\n\tvoid *skb_push(struct sk_buff *skb, unsigned int len);\n\t\tskb-\u003edata -= len;\n\t\t//0xffff88805f86a84c - 0xfffffffc = 0xffff887f5f86a850\nskb-\u003edata is set to 0xffff887f5f86a850, which is invalid mem addr, lead to skb_push() fails.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: ip6mr: Fix skb_under_panic in ip6mr_cache_report()",
"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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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2023-53365"
},
{
"category": "external",
"summary": "RHBZ#2396130",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2396130"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2023-53365",
"url": "https://www.cve.org/CVERecord?id=CVE-2023-53365"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2023-53365",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-53365"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025091723-CVE-2023-53365-acb1@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025091723-CVE-2023-53365-acb1@gregkh/T"
}
],
"release_date": "2025-09-17T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2025-11-25T18:17:51+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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"title": "kernel: ip6mr: Fix skb_under_panic in ip6mr_cache_report()"
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{
"cve": "CVE-2023-53513",
"cwe": {
"id": "CWE-190",
"name": "Integer Overflow or Wraparound"
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"discovery_date": "2025-10-01T00:00:00+00:00",
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"text": "2400795"
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{
"category": "description",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nnbd: fix incomplete validation of ioctl arg\n\nWe tested and found an alarm caused by nbd_ioctl arg without verification.\nThe UBSAN warning calltrace like below:\n\nUBSAN: Undefined behaviour in fs/buffer.c:1709:35\nsigned integer overflow:\n-9223372036854775808 - 1 cannot be represented in type \u0027long long int\u0027\nCPU: 3 PID: 2523 Comm: syz-executor.0 Not tainted 4.19.90 #1\nHardware name: linux,dummy-virt (DT)\nCall trace:\n dump_backtrace+0x0/0x3f0 arch/arm64/kernel/time.c:78\n show_stack+0x28/0x38 arch/arm64/kernel/traps.c:158\n __dump_stack lib/dump_stack.c:77 [inline]\n dump_stack+0x170/0x1dc lib/dump_stack.c:118\n ubsan_epilogue+0x18/0xb4 lib/ubsan.c:161\n handle_overflow+0x188/0x1dc lib/ubsan.c:192\n __ubsan_handle_sub_overflow+0x34/0x44 lib/ubsan.c:206\n __block_write_full_page+0x94c/0xa20 fs/buffer.c:1709\n block_write_full_page+0x1f0/0x280 fs/buffer.c:2934\n blkdev_writepage+0x34/0x40 fs/block_dev.c:607\n __writepage+0x68/0xe8 mm/page-writeback.c:2305\n write_cache_pages+0x44c/0xc70 mm/page-writeback.c:2240\n generic_writepages+0xdc/0x148 mm/page-writeback.c:2329\n blkdev_writepages+0x2c/0x38 fs/block_dev.c:2114\n do_writepages+0xd4/0x250 mm/page-writeback.c:2344\n\nThe reason for triggering this warning is __block_write_full_page()\n-\u003e i_size_read(inode) - 1 overflow.\ninode-\u003ei_size is assigned in __nbd_ioctl() -\u003e nbd_set_size() -\u003e bytesize.\nWe think it is necessary to limit the size of arg to prevent errors.\n\nMoreover, __nbd_ioctl() -\u003e nbd_add_socket(), arg will be cast to int.\nAssuming the value of arg is 0x80000000000000001) (on a 64-bit machine),\nit will become 1 after the coercion, which will return unexpected results.\n\nFix it by adding checks to prevent passing in too large numbers.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: nbd: fix incomplete validation of ioctl arg",
"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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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2023-53513"
},
{
"category": "external",
"summary": "RHBZ#2400795",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2400795"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2023-53513",
"url": "https://www.cve.org/CVERecord?id=CVE-2023-53513"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2023-53513",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-53513"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025100130-CVE-2023-53513-4667@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025100130-CVE-2023-53513-4667@gregkh/T"
}
],
"release_date": "2025-10-01T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2025-11-25T18:17:51+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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{
"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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},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-39702",
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},
{
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"url": "https://lore.kernel.org/linux-cve-announce/2025090548-CVE-2025-39702-cb30@gregkh/T"
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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.",
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},
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"url": "https://www.cve.org/CVERecord?id=CVE-2025-39757"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-39757",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39757"
},
{
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"url": "https://lore.kernel.org/linux-cve-announce/2025091144-CVE-2025-39757-e212@gregkh/T"
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"date": "2025-11-25T18:17:51+00:00",
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{
"cve": "CVE-2025-39817",
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"name": "Out-of-bounds Read"
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{
"category": "description",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nefivarfs: Fix slab-out-of-bounds in efivarfs_d_compare\n\nObserved on kernel 6.6 (present on master as well):\n\n BUG: KASAN: slab-out-of-bounds in memcmp+0x98/0xd0\n Call trace:\n kasan_check_range+0xe8/0x190\n __asan_loadN+0x1c/0x28\n memcmp+0x98/0xd0\n efivarfs_d_compare+0x68/0xd8\n __d_lookup_rcu_op_compare+0x178/0x218\n __d_lookup_rcu+0x1f8/0x228\n d_alloc_parallel+0x150/0x648\n lookup_open.isra.0+0x5f0/0x8d0\n open_last_lookups+0x264/0x828\n path_openat+0x130/0x3f8\n do_filp_open+0x114/0x248\n do_sys_openat2+0x340/0x3c0\n __arm64_sys_openat+0x120/0x1a0\n\nIf dentry-\u003ed_name.len \u003c EFI_VARIABLE_GUID_LEN , \u0027guid\u0027 can become\nnegative, leadings to oob. The issue can be triggered by parallel\nlookups using invalid filename:\n\n T1\t\t\tT2\n lookup_open\n -\u003elookup\n simple_lookup\n d_add\n // invalid dentry is added to hash list\n\n\t\t\tlookup_open\n\t\t\t d_alloc_parallel\n\t\t\t __d_lookup_rcu\n\t\t\t __d_lookup_rcu_op_compare\n\t\t\t hlist_bl_for_each_entry_rcu\n\t\t\t // invalid dentry can be retrieved\n\t\t\t -\u003ed_compare\n\t\t\t efivarfs_d_compare\n\t\t\t // oob\n\nFix it by checking \u0027guid\u0027 before cmp.",
"title": "Vulnerability description"
},
{
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"text": "kernel: efivarfs: Fix slab-out-of-bounds in efivarfs_d_compare",
"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": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2025-39817"
},
{
"category": "external",
"summary": "RHBZ#2395805",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2395805"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-39817",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-39817"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-39817",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39817"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025091615-CVE-2025-39817-90b7@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025091615-CVE-2025-39817-90b7@gregkh/T"
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{
"category": "vendor_fix",
"date": "2025-11-25T18:17:51+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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"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nx86/vmscape: Add conditional IBPB mitigation\n\nVMSCAPE is a vulnerability that exploits insufficient branch predictor\nisolation between a guest and a userspace hypervisor (like QEMU). Existing\nmitigations already protect kernel/KVM from a malicious guest. Userspace\ncan additionally be protected by flushing the branch predictors after a\nVMexit.\n\nSince it is the userspace that consumes the poisoned branch predictors,\nconditionally issue an IBPB after a VMexit and before returning to\nuserspace. Workloads that frequently switch between hypervisor and\nuserspace will incur the most overhead from the new IBPB.\n\nThis new IBPB is not integrated with the existing IBPB sites. For\ninstance, a task can use the existing speculation control prctl() to\nget an IBPB at context switch time. With this implementation, the\nIBPB is doubled up: one at context switch and another before running\nuserspace.\n\nThe intent is to integrate and optimize these cases post-embargo.\n\n[ dhansen: elaborate on suboptimal IBPB solution ]",
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{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2025-40300"
},
{
"category": "external",
"summary": "RHBZ#2394627",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2394627"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-40300",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-40300"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-40300",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40300"
}
],
"release_date": "2025-09-11T16:49:24.809000+00:00",
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{
"category": "vendor_fix",
"date": "2025-11-25T18:17:51+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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}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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