CVE-2024-50048 (GCVE-0-2024-50048)

Vulnerability from cvelistv5 – Published: 2024-10-21 19:39 – Updated: 2025-11-03 22:24
VLAI?
Title
fbcon: Fix a NULL pointer dereference issue in fbcon_putcs
Summary
In the Linux kernel, the following vulnerability has been resolved: fbcon: Fix a NULL pointer dereference issue in fbcon_putcs syzbot has found a NULL pointer dereference bug in fbcon. Here is the simplified C reproducer: struct param { uint8_t type; struct tiocl_selection ts; }; int main() { struct fb_con2fbmap con2fb; struct param param; int fd = open("/dev/fb1", 0, 0); con2fb.console = 0x19; con2fb.framebuffer = 0; ioctl(fd, FBIOPUT_CON2FBMAP, &con2fb); param.type = 2; param.ts.xs = 0; param.ts.ys = 0; param.ts.xe = 0; param.ts.ye = 0; param.ts.sel_mode = 0; int fd1 = open("/dev/tty1", O_RDWR, 0); ioctl(fd1, TIOCLINUX, &param); con2fb.console = 1; con2fb.framebuffer = 0; ioctl(fd, FBIOPUT_CON2FBMAP, &con2fb); return 0; } After calling ioctl(fd1, TIOCLINUX, &param), the subsequent ioctl(fd, FBIOPUT_CON2FBMAP, &con2fb) causes the kernel to follow a different execution path: set_con2fb_map -> con2fb_init_display -> fbcon_set_disp -> redraw_screen -> hide_cursor -> clear_selection -> highlight -> invert_screen -> do_update_region -> fbcon_putcs -> ops->putcs Since ops->putcs is a NULL pointer, this leads to a kernel panic. To prevent this, we need to call set_blitting_type() within set_con2fb_map() to properly initialize ops->putcs.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: b07db39584856e16814e2f065380e533a001535d , < 8266ae6eafdcd5a3136592445ff4038bbc7ee80e (git)
Affected: b07db39584856e16814e2f065380e533a001535d , < f7fb5dda555344529ce584ff7a28b109528d2f1b (git)
Affected: b07db39584856e16814e2f065380e533a001535d , < e5c2dba62996a3a6eeb34bd248b90fc69c5a6a1b (git)
Affected: b07db39584856e16814e2f065380e533a001535d , < 5b97eebcce1b4f3f07a71f635d6aa3af96c236e7 (git)
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    Linux Linux Affected: 5.19
Unaffected: 0 , < 5.19 (semver)
Unaffected: 6.1.113 , ≤ 6.1.* (semver)
Unaffected: 6.6.57 , ≤ 6.6.* (semver)
Unaffected: 6.11.4 , ≤ 6.11.* (semver)
Unaffected: 6.12 , ≤ * (original_commit_for_fix)
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param.ts.ys = 0;\\n\\tparam.ts.xe = 0; param.ts.ye = 0;\\n\\tparam.ts.sel_mode = 0;\\n\\n\\tint fd1 = open(\\\"/dev/tty1\\\", O_RDWR, 0);\\n\\tioctl(fd1, TIOCLINUX, \u0026param);\\n\\n\\tcon2fb.console = 1;\\n\\tcon2fb.framebuffer = 0;\\n\\tioctl(fd, FBIOPUT_CON2FBMAP, \u0026con2fb);\\n\\n\\treturn 0;\\n}\\n\\nAfter calling ioctl(fd1, TIOCLINUX, \u0026param), the subsequent ioctl(fd, FBIOPUT_CON2FBMAP, \u0026con2fb)\\ncauses the kernel to follow a different execution path:\\n\\n set_con2fb_map\\n  -\u003e con2fb_init_display\\n   -\u003e fbcon_set_disp\\n    -\u003e redraw_screen\\n     -\u003e hide_cursor\\n      -\u003e clear_selection\\n       -\u003e highlight\\n        -\u003e invert_screen\\n         -\u003e do_update_region\\n          -\u003e fbcon_putcs\\n           -\u003e ops-\u003eputcs\\n\\nSince ops-\u003eputcs is a NULL pointer, this leads to a kernel panic.\\nTo prevent this, we need to call set_blitting_type() within set_con2fb_map()\\nto properly initialize ops-\u003eputcs.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.113\", \"versionStartIncluding\": \"5.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.57\", \"versionStartIncluding\": \"5.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.11.4\", \"versionStartIncluding\": \"5.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12\", \"versionStartIncluding\": \"5.19\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-21T09:13:37.435Z\"}}}",
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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