{"id":"CVE-2022-50222","state":"PUBLISHED","title":"tty: vt: initialize unicode screen buffer","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ntty: vt: initialize unicode screen buffer\n\nsyzbot reports kernel infoleak at vcs_read() [1], for buffer can be read\nimmediately after resize operation. Initialize buffer using kzalloc().\n\n  ----------\n  #include <fcntl.h>\n  #include <unistd.h>\n  #include <sys/ioctl.h>\n  #include <linux/fb.h>\n\n  int main(int argc, char *argv[])\n  {\n    struct fb_var_screeninfo var = { };\n    const int fb_fd = open(\"/dev/fb0\", 3);\n    ioctl(fb_fd, FBIOGET_VSCREENINFO, &var);\n    var.yres = 0x21;\n    ioctl(fb_fd, FBIOPUT_VSCREENINFO, &var);\n    return read(open(\"/dev/vcsu\", O_RDONLY), &var, sizeof(var)) == -1;\n  }\n  ----------","publishedAt":"2025-06-18T11:03:56.744Z","updatedAt":"2026-05-11T19:15:10.357Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d8ae7242718738ee1bf9bfdd632d2a4b150fdd26","status":"affected","lessThan":"e02fa87e572bb7d90dcdbce9c0f519f1eb992e96","versionType":"git"},{"version":"d8ae7242718738ee1bf9bfdd632d2a4b150fdd26","status":"affected","lessThan":"cc9e874dace0c89ae535230c7da19b764746811e","versionType":"git"},{"version":"d8ae7242718738ee1bf9bfdd632d2a4b150fdd26","status":"affected","lessThan":"5c6c65681f39bf71bc72ed589dec3b8b20e75cac","versionType":"git"},{"version":"d8ae7242718738ee1bf9bfdd632d2a4b150fdd26","status":"affected","lessThan":"446f123aa6021e5f75a20789f05ff3f7ae51a42f","versionType":"git"},{"version":"d8ae7242718738ee1bf9bfdd632d2a4b150fdd26","status":"affected","lessThan":"777a462e1ae50a01fc4a871efa8e34d596a1e17d","versionType":"git"},{"version":"d8ae7242718738ee1bf9bfdd632d2a4b150fdd26","status":"affected","lessThan":"e0ef23e9b0ad18b9fd3741b0f1ad2282e4a18def","versionType":"git"},{"version":"d8ae7242718738ee1bf9bfdd632d2a4b150fdd26","status":"affected","lessThan":"af77c56aa35325daa2bc2bed5c2ebf169be61b86","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/tty/vt/vt.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.19","versionType":"semver"},{"version":"4.19.256","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.211","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.137","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.61","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.18.18","status":"unaffected","lessThanOrEqual":"5.18.*","versionType":"semver"},{"version":"5.19.2","status":"unaffected","lessThanOrEqual":"5.19.*","versionType":"semver"},{"version":"6.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/tty/vt/vt.c"]}],"references":["https://git.kernel.org/stable/c/e02fa87e572bb7d90dcdbce9c0f519f1eb992e96","https://git.kernel.org/stable/c/cc9e874dace0c89ae535230c7da19b764746811e","https://git.kernel.org/stable/c/5c6c65681f39bf71bc72ed589dec3b8b20e75cac","https://git.kernel.org/stable/c/446f123aa6021e5f75a20789f05ff3f7ae51a42f","https://git.kernel.org/stable/c/777a462e1ae50a01fc4a871efa8e34d596a1e17d","https://git.kernel.org/stable/c/e0ef23e9b0ad18b9fd3741b0f1ad2282e4a18def","https://git.kernel.org/stable/c/af77c56aa35325daa2bc2bed5c2ebf169be61b86"],"weaknesses":[],"ingestedAt":"2026-10-29T20:05:26.763Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2022/50xxx/CVE-2022-50222.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2022-50222","state":"PUBLISHED","datePublished":"2025-06-18T11:03:56.744Z","dateUpdated":"2026-05-11T19:15:10.357Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-06-18T10:57:27.430Z"},"containers":{"cna":{"title":"tty: vt: initialize unicode screen buffer","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ntty: vt: initialize unicode screen buffer\n\nsyzbot reports kernel infoleak at vcs_read() [1], for buffer can be read\nimmediately after resize operation. Initialize buffer using kzalloc().\n\n  ----------\n  #include <fcntl.h>\n  #include <unistd.h>\n  #include <sys/ioctl.h>\n  #include <linux/fb.h>\n\n  int main(int argc, char *argv[])\n  {\n    struct fb_var_screeninfo var = { };\n    const int fb_fd = open(\"/dev/fb0\", 3);\n    ioctl(fb_fd, FBIOGET_VSCREENINFO, &var);\n    var.yres = 0x21;\n    ioctl(fb_fd, FBIOPUT_VSCREENINFO, &var);\n    return read(open(\"/dev/vcsu\", O_RDONLY), &var, sizeof(var)) == -1;\n  }\n  ----------"}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"d8ae7242718738ee1bf9bfdd632d2a4b150fdd26","status":"affected","lessThan":"e02fa87e572bb7d90dcdbce9c0f519f1eb992e96","versionType":"git"},{"version":"d8ae7242718738ee1bf9bfdd632d2a4b150fdd26","status":"affected","lessThan":"cc9e874dace0c89ae535230c7da19b764746811e","versionType":"git"},{"version":"d8ae7242718738ee1bf9bfdd632d2a4b150fdd26","status":"affected","lessThan":"5c6c65681f39bf71bc72ed589dec3b8b20e75cac","versionType":"git"},{"version":"d8ae7242718738ee1bf9bfdd632d2a4b150fdd26","status":"affected","lessThan":"446f123aa6021e5f75a20789f05ff3f7ae51a42f","versionType":"git"},{"version":"d8ae7242718738ee1bf9bfdd632d2a4b150fdd26","status":"affected","lessThan":"777a462e1ae50a01fc4a871efa8e34d596a1e17d","versionType":"git"},{"version":"d8ae7242718738ee1bf9bfdd632d2a4b150fdd26","status":"affected","lessThan":"e0ef23e9b0ad18b9fd3741b0f1ad2282e4a18def","versionType":"git"},{"version":"d8ae7242718738ee1bf9bfdd632d2a4b150fdd26","status":"affected","lessThan":"af77c56aa35325daa2bc2bed5c2ebf169be61b86","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/tty/vt/vt.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.19","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.19","versionType":"semver"},{"version":"4.19.256","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.211","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.137","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.61","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.18.18","status":"unaffected","lessThanOrEqual":"5.18.*","versionType":"semver"},{"version":"5.19.2","status":"unaffected","lessThanOrEqual":"5.19.*","versionType":"semver"},{"version":"6.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/tty/vt/vt.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/e02fa87e572bb7d90dcdbce9c0f519f1eb992e96"},{"url":"https://git.kernel.org/stable/c/cc9e874dace0c89ae535230c7da19b764746811e"},{"url":"https://git.kernel.org/stable/c/5c6c65681f39bf71bc72ed589dec3b8b20e75cac"},{"url":"https://git.kernel.org/stable/c/446f123aa6021e5f75a20789f05ff3f7ae51a42f"},{"url":"https://git.kernel.org/stable/c/777a462e1ae50a01fc4a871efa8e34d596a1e17d"},{"url":"https://git.kernel.org/stable/c/e0ef23e9b0ad18b9fd3741b0f1ad2282e4a18def"},{"url":"https://git.kernel.org/stable/c/af77c56aa35325daa2bc2bed5c2ebf169be61b86"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T19:15:10.357Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"4.19.256"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"5.4.211"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"5.10.137"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"5.15.61"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"5.18.18"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"5.19.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"6.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}