CVE-2023-52973 (GCVE-0-2023-52973)
Vulnerability from cvelistv5 – Published: 2025-03-27 16:43 – Updated: 2026-08-05 09:12
VLAI
EPSS
VEX
Title
vc_screen: move load of struct vc_data pointer in vcs_read() to avoid UAF
Summary
In the Linux kernel, the following vulnerability has been resolved:
vc_screen: move load of struct vc_data pointer in vcs_read() to avoid UAF
After a call to console_unlock() in vcs_read() the vc_data struct can be
freed by vc_deallocate(). Because of that, the struct vc_data pointer
load must be done at the top of while loop in vcs_read() to avoid a UAF
when vcs_size() is called.
Syzkaller reported a UAF in vcs_size().
BUG: KASAN: use-after-free in vcs_size (drivers/tty/vt/vc_screen.c:215)
Read of size 4 at addr ffff8881137479a8 by task 4a005ed81e27e65/1537
CPU: 0 PID: 1537 Comm: 4a005ed81e27e65 Not tainted 6.2.0-rc5 #1
Hardware name: Red Hat KVM, BIOS 1.15.0-2.module
Call Trace:
<TASK>
__asan_report_load4_noabort (mm/kasan/report_generic.c:350)
vcs_size (drivers/tty/vt/vc_screen.c:215)
vcs_read (drivers/tty/vt/vc_screen.c:415)
vfs_read (fs/read_write.c:468 fs/read_write.c:450)
...
</TASK>
Allocated by task 1191:
...
kmalloc_trace (mm/slab_common.c:1069)
vc_allocate (./include/linux/slab.h:580 ./include/linux/slab.h:720
drivers/tty/vt/vt.c:1128 drivers/tty/vt/vt.c:1108)
con_install (drivers/tty/vt/vt.c:3383)
tty_init_dev (drivers/tty/tty_io.c:1301 drivers/tty/tty_io.c:1413
drivers/tty/tty_io.c:1390)
tty_open (drivers/tty/tty_io.c:2080 drivers/tty/tty_io.c:2126)
chrdev_open (fs/char_dev.c:415)
do_dentry_open (fs/open.c:883)
vfs_open (fs/open.c:1014)
...
Freed by task 1548:
...
kfree (mm/slab_common.c:1021)
vc_port_destruct (drivers/tty/vt/vt.c:1094)
tty_port_destructor (drivers/tty/tty_port.c:296)
tty_port_put (drivers/tty/tty_port.c:312)
vt_disallocate_all (drivers/tty/vt/vt_ioctl.c:662 (discriminator 2))
vt_ioctl (drivers/tty/vt/vt_ioctl.c:903)
tty_ioctl (drivers/tty/tty_io.c:2776)
...
The buggy address belongs to the object at ffff888113747800
which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 424 bytes inside of
1024-byte region [ffff888113747800, ffff888113747c00)
The buggy address belongs to the physical page:
page:00000000b3fe6c7c refcount:1 mapcount:0 mapping:0000000000000000
index:0x0 pfn:0x113740
head:00000000b3fe6c7c order:3 compound_mapcount:0 subpages_mapcount:0
compound_pincount:0
anon flags: 0x17ffffc0010200(slab|head|node=0|zone=2|lastcpupid=0x1fffff)
raw: 0017ffffc0010200 ffff888100042dc0 0000000000000000 dead000000000001
raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff888113747880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888113747900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
> ffff888113747980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888113747a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888113747a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
Disabling lock debugging due to kernel taint
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-03-27 16:59 UTC
CWE
- CWE-416 - Use After Free
Assigner
References
7 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff , < af79ea9a2443016f64d8fd8d72020cc874f0e066
(git)
Affected: ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff , < 6332f52f44b9776568bf3c0b714ddfb0bb175e78 (git) Affected: ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff , < d0332cbf53dad06a22189cc341391237f4ea6d9f (git) Affected: ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff , < 55515d7d8743b71b80bfe68e89eb9d92630626ab (git) Affected: ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff , < fc9e27f3ba083534b8bbf72ab0f5c810ffdc7d18 (git) Affected: ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff , < 8506f16aae9daf354e3732bcfd447e2a97f023df (git) Affected: ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff , < 226fae124b2dac217ea5436060d623ff3385bc34 (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.38
Unaffected: 0 , < 2.6.38 (semver) Unaffected: 4.14.329 , ≤ 4.14.* (semver) Unaffected: 4.19.273 , ≤ 4.19.* (semver) Unaffected: 5.4.232 , ≤ 5.4.* (semver) Unaffected: 5.10.168 , ≤ 5.10.* (semver) Unaffected: 5.15.93 , ≤ 5.15.* (semver) Unaffected: 6.1.11 , ≤ 6.1.* (semver) Unaffected: 6.2 , ≤ * (original_commit_for_fix) |
guessed |
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{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvc_screen: move load of struct vc_data pointer in vcs_read() to avoid UAF\n\nAfter a call to console_unlock() in vcs_read() the vc_data struct can be\nfreed by vc_deallocate(). Because of that, the struct vc_data pointer\nload must be done at the top of while loop in vcs_read() to avoid a UAF\nwhen vcs_size() is called.\n\nSyzkaller reported a UAF in vcs_size().\n\nBUG: KASAN: use-after-free in vcs_size (drivers/tty/vt/vc_screen.c:215)\nRead of size 4 at addr ffff8881137479a8 by task 4a005ed81e27e65/1537\n\nCPU: 0 PID: 1537 Comm: 4a005ed81e27e65 Not tainted 6.2.0-rc5 #1\nHardware name: Red Hat KVM, BIOS 1.15.0-2.module\nCall Trace:\n \u003cTASK\u003e\n__asan_report_load4_noabort (mm/kasan/report_generic.c:350)\nvcs_size (drivers/tty/vt/vc_screen.c:215)\nvcs_read (drivers/tty/vt/vc_screen.c:415)\nvfs_read (fs/read_write.c:468 fs/read_write.c:450)\n...\n \u003c/TASK\u003e\n\nAllocated by task 1191:\n...\nkmalloc_trace (mm/slab_common.c:1069)\nvc_allocate (./include/linux/slab.h:580 ./include/linux/slab.h:720\n drivers/tty/vt/vt.c:1128 drivers/tty/vt/vt.c:1108)\ncon_install (drivers/tty/vt/vt.c:3383)\ntty_init_dev (drivers/tty/tty_io.c:1301 drivers/tty/tty_io.c:1413\n drivers/tty/tty_io.c:1390)\ntty_open (drivers/tty/tty_io.c:2080 drivers/tty/tty_io.c:2126)\nchrdev_open (fs/char_dev.c:415)\ndo_dentry_open (fs/open.c:883)\nvfs_open (fs/open.c:1014)\n...\n\nFreed by task 1548:\n...\nkfree (mm/slab_common.c:1021)\nvc_port_destruct (drivers/tty/vt/vt.c:1094)\ntty_port_destructor (drivers/tty/tty_port.c:296)\ntty_port_put (drivers/tty/tty_port.c:312)\nvt_disallocate_all (drivers/tty/vt/vt_ioctl.c:662 (discriminator 2))\nvt_ioctl (drivers/tty/vt/vt_ioctl.c:903)\ntty_ioctl (drivers/tty/tty_io.c:2776)\n...\n\nThe buggy address belongs to the object at ffff888113747800\n which belongs to the cache kmalloc-1k of size 1024\nThe buggy address is located 424 bytes inside of\n 1024-byte region [ffff888113747800, ffff888113747c00)\n\nThe buggy address belongs to the physical page:\npage:00000000b3fe6c7c refcount:1 mapcount:0 mapping:0000000000000000\n index:0x0 pfn:0x113740\nhead:00000000b3fe6c7c order:3 compound_mapcount:0 subpages_mapcount:0\n compound_pincount:0\nanon flags: 0x17ffffc0010200(slab|head|node=0|zone=2|lastcpupid=0x1fffff)\nraw: 0017ffffc0010200 ffff888100042dc0 0000000000000000 dead000000000001\nraw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000\npage dumped because: kasan: bad access detected\n\nMemory state around the buggy address:\n ffff888113747880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n ffff888113747900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n\u003e ffff888113747980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n ^\n ffff888113747a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n ffff888113747a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n==================================================================\nDisabling lock debugging due to kernel taint"
}
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"lang": "en",
"value": "AV:L - The vulnerability is reached via open/read on /dev/vcs* character devices (vcs_read), which requires local system access through the VFS syscall path, not network or adjacent network access.\nAC:L - The attacker controls both sides of the race\u2014one thread reading a large buffer from /dev/vcsN and another issuing VT_DISALLOCATE on a VT tty\u2014so success does not depend on conditions outside attacker influence.\nPR:L - Exploitation needs only an unprivileged local account with access to a VT tty and /dev/vcs* (e.g., tty group or console login); VT_DISALLOCATE notably performs no perm/capability check, so real root is not required.\nUI:N - The attacker opens the devices and triggers the race themselves with no action required from another user.\nS:U - This is a standard in-kernel use-after-free enabling privilege escalation within the same kernel security authority, with no VM escape or cross-boundary impact.\nC:H - Use-after-free of the kmalloc-1k vc_data object allows heap spraying so subsequent vcs_size/vcs_read_buf accesses can disclose arbitrary kernel memory to userspace.\nI:H - Kernel UAF of a sprayed slab object enables classic heap exploitation primitives for arbitrary write and control-flow hijacking beyond a mere crash.\nA:H - The UAF reliably produces KASAN-detectable use-after-free faults and can cause kernel oops/panic when the freed vc_data is dereferenced."
}
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}
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"url": "https://git.kernel.org/stable/c/af79ea9a2443016f64d8fd8d72020cc874f0e066"
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"url": "https://git.kernel.org/stable/c/6332f52f44b9776568bf3c0b714ddfb0bb175e78"
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{
"url": "https://git.kernel.org/stable/c/226fae124b2dac217ea5436060d623ff3385bc34"
}
],
"title": "vc_screen: move load of struct vc_data pointer in vcs_read() to avoid UAF",
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"cveId": "CVE-2023-52973",
"datePublished": "2025-03-27T16:43:12.756Z",
"dateReserved": "2025-03-27T16:40:15.737Z",
"dateUpdated": "2026-08-05T09:12:11.113Z",
"state": "PUBLISHED"
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},
"nvd": "{\"cve\":{\"id\":\"CVE-2023-52973\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-03-27T17:15:44.283\",\"lastModified\":\"2026-06-17T06:44:01.717\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nvc_screen: move load of struct vc_data pointer in vcs_read() to avoid UAF\\n\\nAfter a call to console_unlock() in vcs_read() the vc_data struct can be\\nfreed by vc_deallocate(). Because of that, the struct vc_data pointer\\nload must be done at the top of while loop in vcs_read() to avoid a UAF\\nwhen vcs_size() is called.\\n\\nSyzkaller reported a UAF in vcs_size().\\n\\nBUG: KASAN: use-after-free in vcs_size (drivers/tty/vt/vc_screen.c:215)\\nRead of size 4 at addr ffff8881137479a8 by task 4a005ed81e27e65/1537\\n\\nCPU: 0 PID: 1537 Comm: 4a005ed81e27e65 Not tainted 6.2.0-rc5 #1\\nHardware name: Red Hat KVM, BIOS 1.15.0-2.module\\nCall Trace:\\n \u003cTASK\u003e\\n__asan_report_load4_noabort (mm/kasan/report_generic.c:350)\\nvcs_size (drivers/tty/vt/vc_screen.c:215)\\nvcs_read (drivers/tty/vt/vc_screen.c:415)\\nvfs_read (fs/read_write.c:468 fs/read_write.c:450)\\n...\\n \u003c/TASK\u003e\\n\\nAllocated by task 1191:\\n...\\nkmalloc_trace (mm/slab_common.c:1069)\\nvc_allocate (./include/linux/slab.h:580 ./include/linux/slab.h:720\\n drivers/tty/vt/vt.c:1128 drivers/tty/vt/vt.c:1108)\\ncon_install (drivers/tty/vt/vt.c:3383)\\ntty_init_dev (drivers/tty/tty_io.c:1301 drivers/tty/tty_io.c:1413\\n drivers/tty/tty_io.c:1390)\\ntty_open (drivers/tty/tty_io.c:2080 drivers/tty/tty_io.c:2126)\\nchrdev_open (fs/char_dev.c:415)\\ndo_dentry_open (fs/open.c:883)\\nvfs_open (fs/open.c:1014)\\n...\\n\\nFreed by task 1548:\\n...\\nkfree (mm/slab_common.c:1021)\\nvc_port_destruct (drivers/tty/vt/vt.c:1094)\\ntty_port_destructor (drivers/tty/tty_port.c:296)\\ntty_port_put (drivers/tty/tty_port.c:312)\\nvt_disallocate_all (drivers/tty/vt/vt_ioctl.c:662 (discriminator 2))\\nvt_ioctl (drivers/tty/vt/vt_ioctl.c:903)\\ntty_ioctl (drivers/tty/tty_io.c:2776)\\n...\\n\\nThe buggy address belongs to the object at ffff888113747800\\n which belongs to the cache kmalloc-1k of size 1024\\nThe buggy address is located 424 bytes inside of\\n 1024-byte region [ffff888113747800, ffff888113747c00)\\n\\nThe buggy address belongs to the physical page:\\npage:00000000b3fe6c7c refcount:1 mapcount:0 mapping:0000000000000000\\n index:0x0 pfn:0x113740\\nhead:00000000b3fe6c7c order:3 compound_mapcount:0 subpages_mapcount:0\\n compound_pincount:0\\nanon flags: 0x17ffffc0010200(slab|head|node=0|zone=2|lastcpupid=0x1fffff)\\nraw: 0017ffffc0010200 ffff888100042dc0 0000000000000000 dead000000000001\\nraw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000\\npage dumped because: kasan: bad access detected\\n\\nMemory state around the buggy address:\\n ffff888113747880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\\n ffff888113747900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\\n\u003e ffff888113747980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\\n ^\\n ffff888113747a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\\n ffff888113747a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\\n==================================================================\\nDisabling lock debugging due to kernel taint\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: vc_screen: se desplaza la carga del puntero struct vc_data en vcs_read() para evitar un UAF. Tras una llamada a console_unlock() en vcs_read(), la estructura vc_data puede liberarse mediante vc_deallocate(). Por ello, la carga del puntero struct vc_data debe realizarse al principio del bucle while en vcs_read() para evitar un UAF al llamar a vcs_size(). Syzkaller report\u00f3 un UAF en vcs_size(). ERROR: KASAN: use-after-free in vcs_size (drivers/tty/vt/vc_screen.c:215) Read of size 4 at addr ffff8881137479a8 by task 4a005ed81e27e65/1537 CPU: 0 PID: 1537 Comm: 4a005ed81e27e65 Not tainted 6.2.0-rc5 #1 Hardware name: Red Hat KVM, BIOS 1.15.0-2.module Call Trace: __asan_report_load4_noabort (mm/kasan/report_generic.c:350) vcs_size (drivers/tty/vt/vc_screen.c:215) vcs_read (drivers/tty/vt/vc_screen.c:415) vfs_read (fs/read_write.c:468 fs/read_write.c:450) ... Allocated by task 1191: ... kmalloc_trace (mm/slab_common.c:1069) vc_allocate (./include/linux/slab.h:580 ./include/linux/slab.h:720 drivers/tty/vt/vt.c:1128 drivers/tty/vt/vt.c:1108) con_install (drivers/tty/vt/vt.c:3383) tty_init_dev (drivers/tty/tty_io.c:1301 drivers/tty/tty_io.c:1413 drivers/tty/tty_io.c:1390) tty_open (drivers/tty/tty_io.c:2080 drivers/tty/tty_io.c:2126) chrdev_open (fs/char_dev.c:415) do_dentry_open (fs/open.c:883) vfs_open (fs/open.c:1014) ... Freed by task 1548: ... kfree (mm/slab_common.c:1021) vc_port_destruct (drivers/tty/vt/vt.c:1094) tty_port_destructor (drivers/tty/tty_port.c:296) tty_port_put (drivers/tty/tty_port.c:312) vt_disallocate_all (drivers/tty/vt/vt_ioctl.c:662 (discriminator 2)) vt_ioctl (drivers/tty/vt/vt_ioctl.c:903) tty_ioctl (drivers/tty/tty_io.c:2776) ... The buggy address belongs to the object at ffff888113747800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 424 bytes inside of 1024-byte region [ffff888113747800, ffff888113747c00) The buggy address belongs to the physical page: page:00000000b3fe6c7c refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x113740 head:00000000b3fe6c7c order:3 compound_mapcount:0 subpages_mapcount:0 compound_pincount:0 anon flags: 0x17ffffc0010200(slab|head|node=0|zone=2|lastcpupid=0x1fffff) raw: 0017ffffc0010200 ffff888100042dc0 0000000000000000 dead000000000001 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 p\u00e1gina volcada porque: kasan: mal acceso detectado Estado de memoria alrededor de la direcci\u00f3n con errores: ffff888113747880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888113747900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb \u0026gt; ffff888113747980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888113747a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff888113747a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== Deshabilitar la depuraci\u00f3n de bloqueo debido a una contaminaci\u00f3n del kernel\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/tty/vt/vc_screen.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff\",\"lessThan\":\"af79ea9a2443016f64d8fd8d72020cc874f0e066\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff\",\"lessThan\":\"6332f52f44b9776568bf3c0b714ddfb0bb175e78\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff\",\"lessThan\":\"d0332cbf53dad06a22189cc341391237f4ea6d9f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff\",\"lessThan\":\"55515d7d8743b71b80bfe68e89eb9d92630626ab\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff\",\"lessThan\":\"fc9e27f3ba083534b8bbf72ab0f5c810ffdc7d18\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff\",\"lessThan\":\"8506f16aae9daf354e3732bcfd447e2a97f023df\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff\",\"lessThan\":\"226fae124b2dac217ea5436060d623ff3385bc34\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/tty/vt/vc_screen.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.38\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.38\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.14.329\",\"lessThanOrEqual\":\"4.14.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.19.273\",\"lessThanOrEqual\":\"4.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.232\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.168\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.93\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.11\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2025-03-27T16:59:54.662104Z\",\"id\":\"CVE-2023-52973\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"total\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"2.6.38\",\"versionEndExcluding\":\"4.14.329\",\"matchCriteriaId\":\"076CCCBD-A2DE-4846-BDBA-B44486D5873F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.15\",\"versionEndExcluding\":\"4.19.273\",\"matchCriteriaId\":\"FC86F278-A337-4A8A-A7BB-758898345802\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.20\",\"versionEndExcluding\":\"5.4.232\",\"matchCriteriaId\":\"9C6E0696-3702-4B0C-A102-2753BDC8C3D3\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.168\",\"matchCriteriaId\":\"12258A3F-04BD-49C9-9C6B-D3C1945E8910\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.93\",\"matchCriteriaId\":\"98FAC10E-42A0-4372-B1A0-A49CF672890E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.11\",\"matchCriteriaId\":\"535D03F4-DA02-49FE-934E-668827E6407B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.2:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"FF501633-2F44-4913-A8EE-B021929F49F6\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.2:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"2BDA597B-CAC1-4DF0-86F0-42E142C654E9\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.2:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"725C78C9-12CE-406F-ABE8-0813A01D66E8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.2:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"A127C155-689C-4F67-B146-44A57F4BFD85\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.2:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"D34127CC-68F5-4703-A5F6-5006F803E4AE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.2:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"4AB8D555-648E-4F2F-98BD-3E7F45BD12A8\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/226fae124b2dac217ea5436060d623ff3385bc34\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/55515d7d8743b71b80bfe68e89eb9d92630626ab\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/6332f52f44b9776568bf3c0b714ddfb0bb175e78\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/8506f16aae9daf354e3732bcfd447e2a97f023df\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/af79ea9a2443016f64d8fd8d72020cc874f0e066\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d0332cbf53dad06a22189cc341391237f4ea6d9f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/fc9e27f3ba083534b8bbf72ab0f5c810ffdc7d18\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-06-29T23:13:34+00:00",
"cve": "CVE-2023-52973",
"id": "CVE-2023-52973",
"initial_release_date": "2023-01-01T00:00:00+00:00",
"product_status:fixed": "754",
"product_status:known_affected": "66",
"product_status:known_not_affected": "90",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: vc_screen: move load of struct vc_data pointer in vcs_read() to avoid UAF",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-52973.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-08-31T01:02:27Z",
"cve": "CVE-2023-52973",
"id": "CVE-2023-52973",
"initial_release_date": "2025-03-28T03:38:41Z",
"product_status:known_affected": "60",
"product_status:known_not_affected": "189",
"product_status:recommended": "347",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2023-52973",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2023-52973.json",
"version": "27"
},
"vulnrichment": {
"containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.8, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2023-52973\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-03-27T16:59:54.662104Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-416\", \"description\": \"CWE-416 Use After Free\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-03-27T16:59:55.968Z\"}}], \"cna\": {\"title\": \"vc_screen: move load of struct vc_data pointer in vcs_read() to avoid UAF\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 7.8, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"AV:L - The vulnerability is reached via open/read on /dev/vcs* character devices (vcs_read), which requires local system access through the VFS syscall path, not network or adjacent network access.\\nAC:L - The attacker controls both sides of the race\\u2014one thread reading a large buffer from /dev/vcsN and another issuing VT_DISALLOCATE on a VT tty\\u2014so success does not depend on conditions outside attacker influence.\\nPR:L - Exploitation needs only an unprivileged local account with access to a VT tty and /dev/vcs* (e.g., tty group or console login); VT_DISALLOCATE notably performs no perm/capability check, so real root is not required.\\nUI:N - The attacker opens the devices and triggers the race themselves with no action required from another user.\\nS:U - This is a standard in-kernel use-after-free enabling privilege escalation within the same kernel security authority, with no VM escape or cross-boundary impact.\\nC:H - Use-after-free of the kmalloc-1k vc_data object allows heap spraying so subsequent vcs_size/vcs_read_buf accesses can disclose arbitrary kernel memory to userspace.\\nI:H - Kernel UAF of a sprayed slab object enables classic heap exploitation primitives for arbitrary write and control-flow hijacking beyond a mere crash.\\nA:H - The UAF reliably produces KASAN-detectable use-after-free faults and can cause kernel oops/panic when the freed vc_data is dereferenced.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff\", \"lessThan\": \"af79ea9a2443016f64d8fd8d72020cc874f0e066\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff\", \"lessThan\": \"6332f52f44b9776568bf3c0b714ddfb0bb175e78\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff\", \"lessThan\": \"d0332cbf53dad06a22189cc341391237f4ea6d9f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff\", \"lessThan\": \"55515d7d8743b71b80bfe68e89eb9d92630626ab\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff\", \"lessThan\": \"fc9e27f3ba083534b8bbf72ab0f5c810ffdc7d18\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff\", \"lessThan\": \"8506f16aae9daf354e3732bcfd447e2a97f023df\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff\", \"lessThan\": \"226fae124b2dac217ea5436060d623ff3385bc34\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/tty/vt/vc_screen.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"2.6.38\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"2.6.38\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.14.329\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.273\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.232\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.168\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.93\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.11\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.2\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/tty/vt/vc_screen.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/af79ea9a2443016f64d8fd8d72020cc874f0e066\"}, {\"url\": \"https://git.kernel.org/stable/c/6332f52f44b9776568bf3c0b714ddfb0bb175e78\"}, {\"url\": \"https://git.kernel.org/stable/c/d0332cbf53dad06a22189cc341391237f4ea6d9f\"}, {\"url\": \"https://git.kernel.org/stable/c/55515d7d8743b71b80bfe68e89eb9d92630626ab\"}, {\"url\": \"https://git.kernel.org/stable/c/fc9e27f3ba083534b8bbf72ab0f5c810ffdc7d18\"}, {\"url\": \"https://git.kernel.org/stable/c/8506f16aae9daf354e3732bcfd447e2a97f023df\"}, {\"url\": \"https://git.kernel.org/stable/c/226fae124b2dac217ea5436060d623ff3385bc34\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nvc_screen: move load of struct vc_data pointer in vcs_read() to avoid UAF\\n\\nAfter a call to console_unlock() in vcs_read() the vc_data struct can be\\nfreed by vc_deallocate(). Because of that, the struct vc_data pointer\\nload must be done at the top of while loop in vcs_read() to avoid a UAF\\nwhen vcs_size() is called.\\n\\nSyzkaller reported a UAF in vcs_size().\\n\\nBUG: KASAN: use-after-free in vcs_size (drivers/tty/vt/vc_screen.c:215)\\nRead of size 4 at addr ffff8881137479a8 by task 4a005ed81e27e65/1537\\n\\nCPU: 0 PID: 1537 Comm: 4a005ed81e27e65 Not tainted 6.2.0-rc5 #1\\nHardware name: Red Hat KVM, BIOS 1.15.0-2.module\\nCall Trace:\\n \u003cTASK\u003e\\n__asan_report_load4_noabort (mm/kasan/report_generic.c:350)\\nvcs_size (drivers/tty/vt/vc_screen.c:215)\\nvcs_read (drivers/tty/vt/vc_screen.c:415)\\nvfs_read (fs/read_write.c:468 fs/read_write.c:450)\\n...\\n \u003c/TASK\u003e\\n\\nAllocated by task 1191:\\n...\\nkmalloc_trace (mm/slab_common.c:1069)\\nvc_allocate (./include/linux/slab.h:580 ./include/linux/slab.h:720\\n drivers/tty/vt/vt.c:1128 drivers/tty/vt/vt.c:1108)\\ncon_install (drivers/tty/vt/vt.c:3383)\\ntty_init_dev (drivers/tty/tty_io.c:1301 drivers/tty/tty_io.c:1413\\n drivers/tty/tty_io.c:1390)\\ntty_open (drivers/tty/tty_io.c:2080 drivers/tty/tty_io.c:2126)\\nchrdev_open (fs/char_dev.c:415)\\ndo_dentry_open (fs/open.c:883)\\nvfs_open (fs/open.c:1014)\\n...\\n\\nFreed by task 1548:\\n...\\nkfree (mm/slab_common.c:1021)\\nvc_port_destruct (drivers/tty/vt/vt.c:1094)\\ntty_port_destructor (drivers/tty/tty_port.c:296)\\ntty_port_put (drivers/tty/tty_port.c:312)\\nvt_disallocate_all (drivers/tty/vt/vt_ioctl.c:662 (discriminator 2))\\nvt_ioctl (drivers/tty/vt/vt_ioctl.c:903)\\ntty_ioctl (drivers/tty/tty_io.c:2776)\\n...\\n\\nThe buggy address belongs to the object at ffff888113747800\\n which belongs to the cache kmalloc-1k of size 1024\\nThe buggy address is located 424 bytes inside of\\n 1024-byte region [ffff888113747800, ffff888113747c00)\\n\\nThe buggy address belongs to the physical page:\\npage:00000000b3fe6c7c refcount:1 mapcount:0 mapping:0000000000000000\\n index:0x0 pfn:0x113740\\nhead:00000000b3fe6c7c order:3 compound_mapcount:0 subpages_mapcount:0\\n compound_pincount:0\\nanon flags: 0x17ffffc0010200(slab|head|node=0|zone=2|lastcpupid=0x1fffff)\\nraw: 0017ffffc0010200 ffff888100042dc0 0000000000000000 dead000000000001\\nraw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000\\npage dumped because: kasan: bad access detected\\n\\nMemory state around the buggy address:\\n ffff888113747880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\\n ffff888113747900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\\n\u003e ffff888113747980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\\n ^\\n ffff888113747a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\\n ffff888113747a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\\n==================================================================\\nDisabling lock debugging due to kernel taint\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.329\", \"versionStartIncluding\": \"2.6.38\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.273\", \"versionStartIncluding\": \"2.6.38\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.232\", \"versionStartIncluding\": \"2.6.38\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.168\", \"versionStartIncluding\": \"2.6.38\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.93\", \"versionStartIncluding\": \"2.6.38\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.11\", \"versionStartIncluding\": \"2.6.38\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.2\", \"versionStartIncluding\": \"2.6.38\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T09:12:11.113Z\"}}}",
"cveMetadata": "{\"cveId\": \"CVE-2023-52973\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T09:12:11.113Z\", \"dateReserved\": \"2025-03-27T16:40:15.737Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-03-27T16:43:12.756Z\", \"assignerShortName\": \"Linux\"}",
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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