RHSA-2026:3375
Vulnerability from csaf_redhat - Published: 2026-02-25 19:01 - Updated: 2026-02-26 14:49Summary
Red Hat Security Advisory: kernel-rt security update
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.
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"name": "Expired Pointer Dereference"
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"text": "2420329"
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{
"category": "description",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nip6_vti: fix slab-use-after-free in decode_session6\n\nWhen ipv6_vti device is set to the qdisc of the sfb type, the cb field\nof the sent skb may be modified during enqueuing. Then,\nslab-use-after-free may occur when ipv6_vti device sends IPv6 packets.\n\nThe stack information is as follows:\nBUG: KASAN: slab-use-after-free in decode_session6+0x103f/0x1890\nRead of size 1 at addr ffff88802e08edc2 by task swapper/0/0\nCPU: 0 PID: 0 Comm: swapper/0 Not tainted 6.4.0-next-20230707-00001-g84e2cad7f979 #410\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.14.0-1.fc33 04/01/2014\nCall Trace:\n\u003cIRQ\u003e\ndump_stack_lvl+0xd9/0x150\nprint_address_description.constprop.0+0x2c/0x3c0\nkasan_report+0x11d/0x130\ndecode_session6+0x103f/0x1890\n__xfrm_decode_session+0x54/0xb0\nvti6_tnl_xmit+0x3e6/0x1ee0\ndev_hard_start_xmit+0x187/0x700\nsch_direct_xmit+0x1a3/0xc30\n__qdisc_run+0x510/0x17a0\n__dev_queue_xmit+0x2215/0x3b10\nneigh_connected_output+0x3c2/0x550\nip6_finish_output2+0x55a/0x1550\nip6_finish_output+0x6b9/0x1270\nip6_output+0x1f1/0x540\nndisc_send_skb+0xa63/0x1890\nndisc_send_rs+0x132/0x6f0\naddrconf_rs_timer+0x3f1/0x870\ncall_timer_fn+0x1a0/0x580\nexpire_timers+0x29b/0x4b0\nrun_timer_softirq+0x326/0x910\n__do_softirq+0x1d4/0x905\nirq_exit_rcu+0xb7/0x120\nsysvec_apic_timer_interrupt+0x97/0xc0\n\u003c/IRQ\u003e\nAllocated by task 9176:\nkasan_save_stack+0x22/0x40\nkasan_set_track+0x25/0x30\n__kasan_slab_alloc+0x7f/0x90\nkmem_cache_alloc_node+0x1cd/0x410\nkmalloc_reserve+0x165/0x270\n__alloc_skb+0x129/0x330\nnetlink_sendmsg+0x9b1/0xe30\nsock_sendmsg+0xde/0x190\n____sys_sendmsg+0x739/0x920\n___sys_sendmsg+0x110/0x1b0\n__sys_sendmsg+0xf7/0x1c0\ndo_syscall_64+0x39/0xb0\nentry_SYSCALL_64_after_hwframe+0x63/0xcd\nFreed by task 9176:\nkasan_save_stack+0x22/0x40\nkasan_set_track+0x25/0x30\nkasan_save_free_info+0x2b/0x40\n____kasan_slab_free+0x160/0x1c0\nslab_free_freelist_hook+0x11b/0x220\nkmem_cache_free+0xf0/0x490\nskb_free_head+0x17f/0x1b0\nskb_release_data+0x59c/0x850\nconsume_skb+0xd2/0x170\nnetlink_unicast+0x54f/0x7f0\nnetlink_sendmsg+0x926/0xe30\nsock_sendmsg+0xde/0x190\n____sys_sendmsg+0x739/0x920\n___sys_sendmsg+0x110/0x1b0\n__sys_sendmsg+0xf7/0x1c0\ndo_syscall_64+0x39/0xb0\nentry_SYSCALL_64_after_hwframe+0x63/0xcd\nThe buggy address belongs to the object at ffff88802e08ed00\nwhich belongs to the cache skbuff_small_head of size 640\nThe buggy address is located 194 bytes inside of\nfreed 640-byte region [ffff88802e08ed00, ffff88802e08ef80)\n\nAs commit f855691975bb (\"xfrm6: Fix the nexthdr offset in\n_decode_session6.\") showed, xfrm_decode_session was originally intended\nonly for the receive path. IP6CB(skb)-\u003enhoff is not set during\ntransmission. Therefore, set the cb field in the skb to 0 before\nsending packets.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: ip6_vti: fix slab-use-after-free in decode_session6",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This is a use-after-free vulnerability in IPv6 VTI tunnel handling that can be triggered when specific qdisc configurations are used. The vulnerability requires local access and specific network configuration involving VTI tunnels with SFB qdisc.",
"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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"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"
},
{
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"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.",
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{
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"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nSquashfs: check return result of sb_min_blocksize\n\nSyzkaller reports an \"UBSAN: shift-out-of-bounds in squashfs_bio_read\" bug.\n\nSyzkaller forks multiple processes which after mounting the Squashfs\nfilesystem, issues an ioctl(\"/dev/loop0\", LOOP_SET_BLOCK_SIZE, 0x8000). \nNow if this ioctl occurs at the same time another process is in the\nprocess of mounting a Squashfs filesystem on /dev/loop0, the failure\noccurs. When this happens the following code in squashfs_fill_super()\nfails.\n\n----\nmsblk-\u003edevblksize = sb_min_blocksize(sb, SQUASHFS_DEVBLK_SIZE);\nmsblk-\u003edevblksize_log2 = ffz(~msblk-\u003edevblksize);\n----\n\nsb_min_blocksize() returns 0, which means msblk-\u003edevblksize is set to 0.\n\nAs a result, ffz(~msblk-\u003edevblksize) returns 64, and msblk-\u003edevblksize_log2\nis set to 64.\n\nThis subsequently causes the\n\nUBSAN: shift-out-of-bounds in fs/squashfs/block.c:195:36\nshift exponent 64 is too large for 64-bit type \u0027u64\u0027 (aka\n\u0027unsigned long long\u0027)\n\nThis commit adds a check for a 0 return by sb_min_blocksize().",
"title": "Vulnerability description"
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"text": "kernel: Linux kernel: Memory corruption in Squashfs due to incorrect block size calculation",
"title": "Vulnerability summary"
},
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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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{
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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.",
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"title": "kernel: smb: client: let recv_done verify data_offset, data_length and remaining_data_length"
},
{
"cve": "CVE-2025-40269",
"cwe": {
"id": "CWE-131",
"name": "Incorrect Calculation of Buffer Size"
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"text": "2419919"
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{
"category": "description",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: usb-audio: Fix potential overflow of PCM transfer buffer\n\nThe PCM stream data in USB-audio driver is transferred over USB URB\npacket buffers, and each packet size is determined dynamically. The\npacket sizes are limited by some factors such as wMaxPacketSize USB\ndescriptor. OTOH, in the current code, the actually used packet sizes\nare determined only by the rate and the PPS, which may be bigger than\nthe size limit above. This results in a buffer overflow, as reported\nby syzbot.\n\nBasically when the limit is smaller than the calculated packet size,\nit implies that something is wrong, most likely a weird USB\ndescriptor. So the best option would be just to return an error at\nthe parameter setup time before doing any further operations.\n\nThis patch introduces such a sanity check, and returns -EINVAL when\nthe packet size is greater than maxpacksize. The comparison with\nep-\u003epacksize[1] alone should suffice since it\u0027s always equal or\ngreater than ep-\u003epacksize[0].",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: Linux kernel ALSA USB audio driver: Buffer overflow leading to information disclosure and denial of service",
"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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{
"category": "external",
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{
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"url": "https://www.cve.org/CVERecord?id=CVE-2025-40269"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-40269",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40269"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025120716-CVE-2025-40269-9769@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025120716-CVE-2025-40269-9769@gregkh/T"
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"date": "2026-02-25T19:01:32+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: Linux kernel ALSA USB audio driver: Buffer overflow leading to information disclosure and denial of service"
},
{
"cve": "CVE-2025-40271",
"cwe": {
"id": "CWE-825",
"name": "Expired Pointer Dereference"
},
"discovery_date": "2025-12-06T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2419837"
}
],
"notes": [
{
"category": "description",
"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/proc: fix uaf in proc_readdir_de()\n\nPde is erased from subdir rbtree through rb_erase(), but not set the node\nto EMPTY, which may result in uaf access. We should use RB_CLEAR_NODE()\nset the erased node to EMPTY, then pde_subdir_next() will return NULL to\navoid uaf access.\n\nWe found an uaf issue while using stress-ng testing, need to run testcase\ngetdent and tun in the same time. The steps of the issue is as follows:\n\n1) use getdent to traverse dir /proc/pid/net/dev_snmp6/, and current\n pde is tun3;\n\n2) in the [time windows] unregister netdevice tun3 and tun2, and erase\n them from rbtree. erase tun3 first, and then erase tun2. the\n pde(tun2) will be released to slab;\n\n3) continue to getdent process, then pde_subdir_next() will return\n pde(tun2) which is released, it will case uaf access.\n\nCPU 0 | CPU 1\n-------------------------------------------------------------------------\ntraverse dir /proc/pid/net/dev_snmp6/ | unregister_netdevice(tun-\u003edev) //tun3 tun2\nsys_getdents64() |\n iterate_dir() |\n proc_readdir() |\n proc_readdir_de() | snmp6_unregister_dev()\n pde_get(de); | proc_remove()\n read_unlock(\u0026proc_subdir_lock); | remove_proc_subtree()\n | write_lock(\u0026proc_subdir_lock);\n [time window] | rb_erase(\u0026root-\u003esubdir_node, \u0026parent-\u003esubdir);\n | write_unlock(\u0026proc_subdir_lock);\n read_lock(\u0026proc_subdir_lock); |\n next = pde_subdir_next(de); |\n pde_put(de); |\n de = next; //UAF |\n\nrbtree of dev_snmp6\n |\n pde(tun3)\n / \\\n NULL pde(tun2)",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "kernel: Linux kernel: Use-after-free in proc_readdir_de() can lead to privilege escalation or denial of service.",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "The vulnerability is a race condition in /proc directory enumeration, where a proc_dir_entry can be freed after rb_erase() but still referenced because the rbtree node is not cleared. A local unprivileged attacker can trigger a use-after-free by running getdents() (that calls proc_readdir_de()) in parallel with rapid creation and removal of network-related proc entries (e.g., tun devices). In practice this leads to a kernel NULL-pointer dereference or slab-UAF crash. Reliable exploitation beyond denial-of-service is unlikely due to the narrow timing window, but theoretically possible.\nThe bug could be triggered by the local attacker with the ability to create and remove network devices (e.g. CAP_NET_ADMIN).",
"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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"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2025-40271"
},
{
"category": "external",
"summary": "RHBZ#2419837",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2419837"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2025-40271",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-40271"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2025-40271",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-40271"
},
{
"category": "external",
"summary": "https://lore.kernel.org/linux-cve-announce/2025120716-CVE-2025-40271-7612@gregkh/T",
"url": "https://lore.kernel.org/linux-cve-announce/2025120716-CVE-2025-40271-7612@gregkh/T"
}
],
"release_date": "2025-12-06T00:00:00+00:00",
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{
"category": "vendor_fix",
"date": "2026-02-25T19:01:32+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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"text": "In the Linux kernel, the following vulnerability has been resolved:\n\nNFSv4/pNFS: Clear NFS_INO_LAYOUTCOMMIT in pnfs_mark_layout_stateid_invalid\n\nFixes a crash when layout is null during this call stack:\n\nwrite_inode\n -\u003e nfs4_write_inode\n -\u003e pnfs_layoutcommit_inode\n\npnfs_set_layoutcommit relies on the lseg refcount to keep the layout\naround. Need to clear NFS_INO_LAYOUTCOMMIT otherwise we might attempt\nto reference a null layout.",
"title": "Vulnerability description"
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{
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"text": "kernel: NFSv4/pNFS: Clear NFS_INO_LAYOUTCOMMIT in pnfs_mark_layout_stateid_invalid",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This bug is caused by a stale state flag (NFS_INO_LAYOUTCOMMIT) remaining set after the pNFS layout has been invalidated, leading to a NULL pointer dereference during layout commit handling. The issue results in a kernel crash when specific NFS writeback paths are executed. As it involves no memory corruption or attacker-controlled data, it represents a denial-of-service condition only.\nThe issue is triggered by a connected NFS client through normal pNFS writeback flows and affects the NFS server kernel, requiring an established NFSv4 session rather than unauthenticated network access.",
"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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"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
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"category": "impact",
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"title": "kernel: NFSv4/pNFS: Clear NFS_INO_LAYOUTCOMMIT in pnfs_mark_layout_stateid_invalid"
}
]
}
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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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