# CVE-2023-53747: linux: In the Linux kernel, the following vulnerability has been resolved: vc_screen: reload load of struct vc_data pointer... CVE-2023-53747 is fixed in 77 products on 1 platform, first by ALAS2023-2023-228, released June 21, 2023. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2023-53747 - Priority: High - CVSS: 7.8 (high) - EPSS: 0.0014 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Jun 21, 2023 ## Description In the Linux kernel, the following vulnerability has been resolved: vc_screen: reload load of struct vc_data pointer in vcs_write() to avoid UAF After a call to console_unlock() in vcs_write() the vc_data struct can be freed by vc_port_destruct(). Because of that, the struct vc_data pointer must be reloaded in the while loop in vcs_write() after console_lock() to avoid a UAF when vcs_size() is called. Syzkaller reported a UAF in vcs_size(). BUG: KASAN: slab-use-after-free in vcs_size (drivers/tty/vt/vc_screen.c:215) Read of size 4 at addr ffff8880beab89a8 by task repro_vcs_size/4119 Call Trace: __asan_report_load4_noabort (mm/kasan/report_generic.c:380) vcs_size (drivers/tty/vt/vc_screen.c:215) vcs_write (drivers/tty/vt/vc_screen.c:664) vfs_write (fs/read_write.c:582 fs/read_write.c:564) ... Allocated by task 1213: kmalloc_trace (mm/slab_common.c:1064) vc_allocate (./include/linux/slab.h:559 ./include/linux/slab.h:680 drivers/tty/vt/vt.c:1078 drivers/tty/vt/vt.c:1058) con_install (drivers/tty/vt/vt.c:3334) tty_init_dev (drivers/tty/tty_io.c:1303 drivers/tty/tty_io.c:1415 drivers/tty/tty_io.c:1392) tty_open (drivers/tty/tty_io.c:2082 drivers/tty/tty_io.c:2128) chrdev_open (fs/char_dev.c:415) do_dentry_open (fs/open.c:921) vfs_open (fs/open.c:1052) ... Freed by task 4116: kfree (mm/slab_common.c:1016) vc_port_destruct (drivers/tty/vt/vt.c:1044) 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:2778) ... The buggy address belongs to the object at ffff8880beab8800 which belongs to the cache kmalloc-1k of size 1024 The buggy address is located 424 bytes inside of freed 1024-byte region [ffff8880beab8800, ffff8880beab8c00) The buggy address belongs to the physical page: page:00000000afc77580 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xbeab8 head:00000000afc77580 order:3 entire_mapcount:0 nr_pages_mapped:0 pincount:0 flags: 0xfffffc0010200(slab|head|node=0|zone=1|lastcpupid=0x1fffff) page_type: 0xffffffff() raw: 000fffffc0010200 ffff888100042dc0 ffffea000426de00 dead000000000002 raw: 0000000000000000 0000000000100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880beab8880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880beab8900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8880beab8980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8880beab8a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8880beab8a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== Disabling lock debugging due to kernel taint ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | bpftool RHEL 9 | 0:7.4.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | bpftool amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | bpftool-debuginfo amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | kernel RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | kernel-64k RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-64k-core RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-64k-debug RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-64k-debug-core RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-64k-debug-devel RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-64k-debug-devel-matched RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-64k-debug-modules RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-64k-debug-modules-core RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-64k-debug-modules-extra RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-64k-devel RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-64k-devel-matched RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-64k-modules RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-64k-modules-core RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-64k-modules-extra RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-abi-stablelists RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-core RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-debug RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-debug-core RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-debug-devel RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-debug-devel-matched RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-debug-modules RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-debug-modules-core RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-debug-modules-extra RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-debug-uki-virt RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-debuginfo amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | kernel-debuginfo-common-aarch64 amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | kernel-debuginfo-common-x86_64 amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | kernel-devel RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-devel amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | kernel-devel-matched RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-doc RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-headers amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | kernel-libbpf amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | kernel-libbpf-devel amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | kernel-libbpf-static amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | kernel-livepatch-6.1.34-56.100 amzn 2023 | 1.0-0.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | kernel-modules RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-modules-core RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-modules-extra RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-rt RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-rt-core RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-rt-debug RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-rt-debug-core RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-rt-debug-devel RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-rt-debug-kvm RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-rt-debug-modules RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-rt-debug-modules-core RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-rt-debug-modules-extra RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-rt-devel RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-rt-kvm RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-rt-modules RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-rt-modules-core RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-rt-modules-extra RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-tools RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-tools amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | kernel-tools-debuginfo amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | kernel-tools-devel amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | kernel-tools-libs RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-tools-libs-devel RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-uki-virt RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-uki-virt-addons RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-zfcpdump RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-zfcpdump-core RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-zfcpdump-devel RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-zfcpdump-devel-matched RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-zfcpdump-modules RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-zfcpdump-modules-core RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | kernel-zfcpdump-modules-extra RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | libperf RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | linux Debian 12.15 (bookworm) | 6.1.37-1 | [DEBIAN-CVE-2023-53747](https://patchblox.com/security/data/fix/linux/debian-cve-2023-53747.md) | Dec 8, 2025 | | Linux | linux Debian 13.5 (trixie) | 6.3.7-1 | [DEBIAN-CVE-2023-53747](https://patchblox.com/security/data/fix/linux/debian-cve-2023-53747.md) | Dec 8, 2025 | | Linux | linux Debian 14 | 6.3.7-1 | [DEBIAN-CVE-2023-53747](https://patchblox.com/security/data/fix/linux/debian-cve-2023-53747.md) | Dec 8, 2025 | | Linux | perf RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | perf amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | perf-debuginfo amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | python3-perf RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | python3-perf amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | python3-perf-debuginfo amzn 2023 | 6.1.34-56.100.amzn2023 | [ALAS2023-2023-228](https://patchblox.com/security/data/fix/linux/alas2023-2023-228.md) | Jun 21, 2023 | | Linux | rtla RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | | Linux | rv RHEL 9 | 0:5.14.0-503.11.1.el9_5 | [RHSA-2024:9315](https://patchblox.com/security/data/fix/linux/rhsa-2024-9315.md) | Nov 12, 2024 | --- Data as of 2026-11-08T13:06:02Z UTC. 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