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CVE-2023-52973— Linux kernel 安全漏洞

EPSS 0.01% · P1
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I. CVE-2023-52973の基本情報

脆弱性情報
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脆弱性タイトル
vc_screen: move load of struct vc_data pointer in vcs_read() to avoid UAF
ソース: NVD (National Vulnerability Database)
脆弱性説明
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
ソース: NVD (National Vulnerability Database)
CVSS情報
N/A
ソース: NVD (National Vulnerability Database)
脆弱性タイプ
N/A
ソース: NVD (National Vulnerability Database)
脆弱性タイトル
Linux kernel 安全漏洞
ソース: CNNVD (China National Vulnerability Database)
脆弱性説明
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于vc_screen组件在vcs_read函数中未及时加载vc_data指针，可能导致释放后重用。
ソース: CNNVD (China National Vulnerability Database)
CVSS情報
N/A
ソース: CNNVD (China National Vulnerability Database)
脆弱性タイプ
N/A
ソース: CNNVD (China National Vulnerability Database)

影響を受ける製品

ベンダープロダクト影響を受けるバージョンCPE購読
LinuxLinux ac751efa6a0d70f2c9daef5c7e3a92270f5c2dff ~ af79ea9a2443016f64d8fd8d72020cc874f0e066 -
LinuxLinux 2.6.38 -

II. CVE-2023-52973の公開POC

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III. CVE-2023-52973のインテリジェンス情報

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Same Patch Batch · Linux · 2025-03-27 · 124 CVEs total

CVE-2023-52982fscache: Use wait_on_bit() to wait for the freeing of relinquished volume
CVE-2023-52998net: fec: Use page_pool_put_full_page when freeing rx buffers
CVE-2023-52999net: fix UaF in netns ops registration error path
CVE-2023-52997ipv4: prevent potential spectre v1 gadget in ip_metrics_convert()
CVE-2023-52996ipv4: prevent potential spectre v1 gadget in fib_metrics_match()
CVE-2023-52995riscv/kprobe: Fix instruction simulation of JALR
CVE-2023-52994acpi: Fix suspend with Xen PV
CVE-2023-52993x86/i8259: Mark legacy PIC interrupts with IRQ_LEVEL
CVE-2023-52992bpf: Skip task with pid=1 in send_signal_common()
CVE-2023-52991net: fix NULL pointer in skb_segment_list
CVE-2023-52989firewire: fix memory leak for payload of request subaction to IEC 61883-1 FCP region
CVE-2023-52988ALSA: hda/via: Avoid potential array out-of-bound in add_secret_dac_path()
CVE-2023-52987ASoC: SOF: ipc4-mtrace: prevent underflow in sof_ipc4_priority_mask_dfs_write()
CVE-2023-52986bpf, sockmap: Check for any of tcp_bpf_prots when cloning a listener
CVE-2023-52985arm64: dts: imx8mm-verdin: Do not power down eth-phy
CVE-2023-52984net: phy: dp83822: Fix null pointer access on DP83825/DP83826 devices
CVE-2022-49761btrfs: always report error in run_one_delayed_ref()
CVE-2022-49760mm/hugetlb: fix PTE marker handling in hugetlb_change_protection()
CVE-2022-49759VMCI: Use threaded irqs instead of tasklets
CVE-2023-52974scsi: iscsi_tcp: Fix UAF during login when accessing the shost ipaddress

Showing 20 of 124 CVEs. View all on vendor page →

IV. 関連脆弱性

同じ製品: Linux
同じベンダー: Linux

V. CVE-2023-52973へのコメント

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