{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2022-49271", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2022-49271", "idYear": 2022, "status": "PUBLISHED", "publishedAt": "2025-02-26T01:56:18.148Z", "updatedAt": "2026-05-11T18:56:27.966Z", "importedAt": "2026-10-24T01:56:49.724Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "cifs: prevent bad output lengths in smb2_ioctl_query_info()", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: prevent bad output lengths in smb2_ioctl_query_info()\n\nWhen calling smb2_ioctl_query_info() with\nsmb_query_info::flags=PASSTHRU_FSCTL and\nsmb_query_info::output_buffer_length=0, the following would return\n0x10\n\n\tbuffer = memdup_user(arg + sizeof(struct smb_query_info),\n\t\t\t qi.output_buffer_length);\n\tif (IS_ERR(buffer)) {\n\t\tkfree(vars);\n\t\treturn PTR_ERR(buffer);\n\t}\n\nrather than a valid pointer thus making IS_ERR() check fail. This\nwould then cause a NULL ptr deference in @buffer when accessing it\nlater in smb2_ioctl_query_ioctl(). While at it, prevent having a\n@buffer smaller than 8 bytes to correctly handle SMB2_SET_INFO\nFileEndOfFileInformation requests when\nsmb_query_info::flags=PASSTHRU_SET_INFO.\n\nHere is a small C reproducer which triggers a NULL ptr in @buffer when\npassing an invalid smb_query_info::flags\n\n\t#include \n\t#include \n\t#include \n\t#include \n\t#include \n\t#include \n\n\t#define die(s) perror(s), exit(1)\n\t#define QUERY_INFO 0xc018cf07\n\n\tint main(int argc, char *argv[])\n\t{\n\t\tint fd;\n\n\t\tif (argc < 2)\n\t\t\texit(1);\n\t\tfd = open(argv[1], O_RDONLY);\n\t\tif (fd == -1)\n\t\t\tdie(\"open\");\n\t\tif (ioctl(fd, QUERY_INFO, (uint32_t[]) { 0, 0, 0, 4, 0, 0}) == -1)\n\t\t\tdie(\"ioctl\");\n\t\tclose(fd);\n\t\treturn 0;\n\t}\n\n\tmount.cifs //srv/share /mnt -o ...\n\tgcc repro.c && ./a.out /mnt/f0\n\n\t[ 114.138620] general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN NOPTI\n\t[ 114.139310] KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\n\t[ 114.139775] CPU: 2 PID: 995 Comm: a.out Not tainted 5.17.0-rc8 #1\n\t[ 114.140148] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.15.0-0-g2dd4b9b-rebuilt.opensuse.org 04/01/2014\n\t[ 114.140818] RIP: 0010:smb2_ioctl_query_info+0x206/0x410 [cifs]\n\t[ 114.141221] Code: 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 c8 01 00 00 48 b8 00 00 00 00 00 fc ff df 4c 8b 7b 28 4c 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 9c 01 00 00 49 8b 3f e8 58 02 fb ff 48 8b 14 24\n\t[ 114.142348] RSP: 0018:ffffc90000b47b00 EFLAGS: 00010256\n\t[ 114.142692] RAX: dffffc0000000000 RBX: ffff888115503200 RCX: ffffffffa020580d\n\t[ 114.143119] RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffffffa043a380\n\t[ 114.143544] RBP: ffff888115503278 R08: 0000000000000001 R09: 0000000000000003\n\t[ 114.143983] R10: fffffbfff4087470 R11: 0000000000000001 R12: ffff888115503288\n\t[ 114.144424] R13: 00000000ffffffea R14: ffff888115503228 R15: 0000000000000000\n\t[ 114.144852] FS: 00007f7aeabdf740(0000) GS:ffff888151600000(0000) knlGS:0000000000000000\n\t[ 114.145338] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n\t[ 114.145692] CR2: 00007f7aeacfdf5e CR3: 000000012000e000 CR4: 0000000000350ee0\n\t[ 114.146131] Call Trace:\n\t[ 114.146291] \n\t[ 114.146432] ? smb2_query_reparse_tag+0x890/0x890 [cifs]\n\t[ 114.146800] ? cifs_mapchar+0x460/0x460 [cifs]\n\t[ 114.147121] ? rcu_read_lock_sched_held+0x3f/0x70\n\t[ 114.147412] ? cifs_strndup_to_utf16+0x15b/0x250 [cifs]\n\t[ 114.147775] ? dentry_path_raw+0xa6/0xf0\n\t[ 114.148024] ? cifs_convert_path_to_utf16+0x198/0x220 [cifs]\n\t[ 114.148413] ? smb2_check_message+0x1080/0x1080 [cifs]\n\t[ 114.148766] ? rcu_read_lock_sched_held+0x3f/0x70\n\t[ 114.149065] cifs_ioctl+0x1577/0x3320 [cifs]\n\t[ 114.149371] ? lock_downgrade+0x6f0/0x6f0\n\t[ 114.149631] ? cifs_readdir+0x2e60/0x2e60 [cifs]\n\t[ 114.149956] ? rcu_read_lock_sched_held+0x3f/0x70\n\t[ 114.150250] ? __rseq_handle_notify_resume+0x80b/0xbe0\n\t[ 114.150562] ? __up_read+0x192/0x710\n\t[ 114.150791] ? __ia32_sys_rseq+0xf0/0xf0\n\t[ 114.151025] ? __x64_sys_openat+0x11f/0x1d0\n\t[ 114.151296] __x64_sys_ioctl+0x127/0x190\n\t[ 114.151549] do_syscall_64+0x3b/0x90\n\t[ 114.151768] entry_SYSCALL_64_after_hwframe+0x44/0xae\n\t[ 114.152079] RIP: 0033:0x7f7aead043df\n\t[ 114.152306] Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24\n---truncated---", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "cfaa1181097f6a1a6f4f6670ebc97848efda0883", "status": "affected", "versionType": "git", "lessThan": "9963ccea6087268e1275b992dca5d0dd4b938765" }, { "version": "cfaa1181097f6a1a6f4f6670ebc97848efda0883", "status": "affected", "versionType": "git", "lessThan": "f143f8334fb9eb2f6c7c15b9da1472d9c965fd84" }, { "version": "cfaa1181097f6a1a6f4f6670ebc97848efda0883", "status": "affected", "versionType": "git", "lessThan": "fadddfc1dc3c6f79b21cff4a7e9a6c40b84fbc53" }, { "version": "cfaa1181097f6a1a6f4f6670ebc97848efda0883", "status": "affected", "versionType": "git", "lessThan": "7529fbee10d82493c5cb109e51788bf74816d1c0" }, { "version": "cfaa1181097f6a1a6f4f6670ebc97848efda0883", "status": "affected", "versionType": "git", "lessThan": "b92e358757b91c2827af112cae9af513f26a3f34" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "5.5", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "5.5" }, { "version": "5.10.110", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.33", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "5.16.19", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.16.*" }, { "version": "5.17.2", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.17.*" }, { "version": "5.18", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }