GHSA-G8WQ-W697-WH26
Vulnerability from github – Published: 2024-11-07 12:30 – Updated: 2026-05-12 15:30In the Linux kernel, the following vulnerability has been resolved:
smb: client: fix OOBs when building SMB2_IOCTL request
When using encryption, either enforced by the server or when using 'seal' mount option, the client will squash all compound request buffers down for encryption into a single iov in smb2_set_next_command().
SMB2_ioctl_init() allocates a small buffer (448 bytes) to hold the SMB2_IOCTL request in the first iov, and if the user passes an input buffer that is greater than 328 bytes, smb2_set_next_command() will end up writing off the end of @rqst->iov[0].iov_base as shown below:
mount.cifs //srv/share /mnt -o ...,seal ln -s $(perl -e "print('a')for 1..1024") /mnt/link
BUG: KASAN: slab-out-of-bounds in smb2_set_next_command.cold+0x1d6/0x24c [cifs] Write of size 4116 at addr ffff8881148fcab8 by task ln/859
CPU: 1 UID: 0 PID: 859 Comm: ln Not tainted 6.12.0-rc3 #1 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-2.fc40 04/01/2014 Call Trace: dump_stack_lvl+0x5d/0x80 ? smb2_set_next_command.cold+0x1d6/0x24c [cifs] print_report+0x156/0x4d9 ? smb2_set_next_command.cold+0x1d6/0x24c [cifs] ? __virt_addr_valid+0x145/0x310 ? __phys_addr+0x46/0x90 ? smb2_set_next_command.cold+0x1d6/0x24c [cifs] kasan_report+0xda/0x110 ? smb2_set_next_command.cold+0x1d6/0x24c [cifs] kasan_check_range+0x10f/0x1f0 __asan_memcpy+0x3c/0x60 smb2_set_next_command.cold+0x1d6/0x24c [cifs] smb2_compound_op+0x238c/0x3840 [cifs] ? kasan_save_track+0x14/0x30 ? kasan_save_free_info+0x3b/0x70 ? vfs_symlink+0x1a1/0x2c0 ? do_symlinkat+0x108/0x1c0 ? __pfx_smb2_compound_op+0x10/0x10 [cifs] ? kmem_cache_free+0x118/0x3e0 ? cifs_get_writable_path+0xeb/0x1a0 [cifs] smb2_get_reparse_inode+0x423/0x540 [cifs] ? __pfx_smb2_get_reparse_inode+0x10/0x10 [cifs] ? rcu_is_watching+0x20/0x50 ? __kmalloc_noprof+0x37c/0x480 ? smb2_create_reparse_symlink+0x257/0x490 [cifs] ? smb2_create_reparse_symlink+0x38f/0x490 [cifs] smb2_create_reparse_symlink+0x38f/0x490 [cifs] ? __pfx_smb2_create_reparse_symlink+0x10/0x10 [cifs] ? find_held_lock+0x8a/0xa0 ? hlock_class+0x32/0xb0 ? __build_path_from_dentry_optional_prefix+0x19d/0x2e0 [cifs] cifs_symlink+0x24f/0x960 [cifs] ? __pfx_make_vfsuid+0x10/0x10 ? __pfx_cifs_symlink+0x10/0x10 [cifs] ? make_vfsgid+0x6b/0xc0 ? generic_permission+0x96/0x2d0 vfs_symlink+0x1a1/0x2c0 do_symlinkat+0x108/0x1c0 ? __pfx_do_symlinkat+0x10/0x10 ? strncpy_from_user+0xaa/0x160 __x64_sys_symlinkat+0xb9/0xf0 do_syscall_64+0xbb/0x1d0 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f08d75c13bb
{
"affected": [],
"aliases": [
"CVE-2024-50151"
],
"database_specific": {
"cwe_ids": [
"CWE-787"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2024-11-07T10:15:06Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix OOBs when building SMB2_IOCTL request\n\nWhen using encryption, either enforced by the server or when using\n\u0027seal\u0027 mount option, the client will squash all compound request buffers\ndown for encryption into a single iov in smb2_set_next_command().\n\nSMB2_ioctl_init() allocates a small buffer (448 bytes) to hold the\nSMB2_IOCTL request in the first iov, and if the user passes an input\nbuffer that is greater than 328 bytes, smb2_set_next_command() will\nend up writing off the end of @rqst-\u003eiov[0].iov_base as shown below:\n\n mount.cifs //srv/share /mnt -o ...,seal\n ln -s $(perl -e \"print(\u0027a\u0027)for 1..1024\") /mnt/link\n\n BUG: KASAN: slab-out-of-bounds in\n smb2_set_next_command.cold+0x1d6/0x24c [cifs]\n Write of size 4116 at addr ffff8881148fcab8 by task ln/859\n\n CPU: 1 UID: 0 PID: 859 Comm: ln Not tainted 6.12.0-rc3 #1\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS\n 1.16.3-2.fc40 04/01/2014\n Call Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0x5d/0x80\n ? smb2_set_next_command.cold+0x1d6/0x24c [cifs]\n print_report+0x156/0x4d9\n ? smb2_set_next_command.cold+0x1d6/0x24c [cifs]\n ? __virt_addr_valid+0x145/0x310\n ? __phys_addr+0x46/0x90\n ? smb2_set_next_command.cold+0x1d6/0x24c [cifs]\n kasan_report+0xda/0x110\n ? smb2_set_next_command.cold+0x1d6/0x24c [cifs]\n kasan_check_range+0x10f/0x1f0\n __asan_memcpy+0x3c/0x60\n smb2_set_next_command.cold+0x1d6/0x24c [cifs]\n smb2_compound_op+0x238c/0x3840 [cifs]\n ? kasan_save_track+0x14/0x30\n ? kasan_save_free_info+0x3b/0x70\n ? vfs_symlink+0x1a1/0x2c0\n ? do_symlinkat+0x108/0x1c0\n ? __pfx_smb2_compound_op+0x10/0x10 [cifs]\n ? kmem_cache_free+0x118/0x3e0\n ? cifs_get_writable_path+0xeb/0x1a0 [cifs]\n smb2_get_reparse_inode+0x423/0x540 [cifs]\n ? __pfx_smb2_get_reparse_inode+0x10/0x10 [cifs]\n ? rcu_is_watching+0x20/0x50\n ? __kmalloc_noprof+0x37c/0x480\n ? smb2_create_reparse_symlink+0x257/0x490 [cifs]\n ? smb2_create_reparse_symlink+0x38f/0x490 [cifs]\n smb2_create_reparse_symlink+0x38f/0x490 [cifs]\n ? __pfx_smb2_create_reparse_symlink+0x10/0x10 [cifs]\n ? find_held_lock+0x8a/0xa0\n ? hlock_class+0x32/0xb0\n ? __build_path_from_dentry_optional_prefix+0x19d/0x2e0 [cifs]\n cifs_symlink+0x24f/0x960 [cifs]\n ? __pfx_make_vfsuid+0x10/0x10\n ? __pfx_cifs_symlink+0x10/0x10 [cifs]\n ? make_vfsgid+0x6b/0xc0\n ? generic_permission+0x96/0x2d0\n vfs_symlink+0x1a1/0x2c0\n do_symlinkat+0x108/0x1c0\n ? __pfx_do_symlinkat+0x10/0x10\n ? strncpy_from_user+0xaa/0x160\n __x64_sys_symlinkat+0xb9/0xf0\n do_syscall_64+0xbb/0x1d0\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n RIP: 0033:0x7f08d75c13bb",
"id": "GHSA-g8wq-w697-wh26",
"modified": "2026-05-12T15:30:40Z",
"published": "2024-11-07T12:30:35Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-50151"
},
{
"type": "WEB",
"url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/1ab60323c5201bef25f2a3dc0ccc404d9aca77f1"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2ef632bfb888d1a14f81c1703817951e0bec5531"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6f0516ef1290da24b85461ed08a0938af7415e49"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b209c3a0bc3ac172265c7fa8309e5d00654f2510"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/e07d05b7f5ad9a503d9cab0afde2ab867bb65470"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ed31aba8ce93472d9e16f5cff844ae7c94e9601d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/fe92ddc1c32d4474e605e3a31a4afcd0e7d765ec"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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