smb: client: fix one-byte OOB read in smb2_parse_native_symlink()
Summary
| CVE | CVE-2026-97560 |
|---|
| State | PUBLISHED |
|---|
| Assigner | Linux |
|---|
| Source Priority | CVE Program / NVD first with legacy fallback |
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| Published | 2026-09-25 11:17:06 UTC |
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| Updated | 2026-09-25 11:17:06 UTC |
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| Description | In the Linux kernel, the following vulnerability has been resolved:
smb: client: fix one-byte OOB read in smb2_parse_native_symlink()
When parsing a share-root relative native symlink, memcpy copies
smb_target+1 (skipping the leading separator) but uses
strlen(smb_target)+1 as the length, reading one byte past the
allocated buffer.
This fixes the following KASAN splat when accessing an SMB symlink
with a target of '\a\b':
BUG: KASAN: slab-out-of-bounds in smb2_parse_native_symlink+0x4f5/0xca0
Read of size 5 at addr ffff88800878fe21 by task netfsfuzz-execu/1
CPU: 1 UID: 0 PID: 1 Comm: netfsfuzz-execu Tainted: G N
7.2.0-11943-g2709dd5ae32f-dirty #1 PREEMPT(lazy)
Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix,
1996)
Call Trace:
<TASK>
dump_stack_lvl+0x7b/0xa0
print_report+0xd0/0x630
kasan_report+0xe5/0x120
kasan_check_range+0x105/0x1b0
__asan_memcpy+0x23/0x60
smb2_parse_native_symlink+0x4f5/0xca0
parse_reparse_point+0x68a/0x1530
reparse_info_to_fattr+0x752/0xa20
cifs_get_fattr+0x873/0x15b0
cifs_get_inode_info+0xc0/0x310
cifs_lookup+0x308/0xa70
__lookup_slow+0x122/0x2b0
lookup_slow+0x50/0x70
path_lookupat+0x525/0xaf0
filename_lookup+0x1f2/0x550
vfs_statx+0xd1/0x1a0
vfs_fstatat+0x65/0xc0
__do_sys_newfstatat+0x9a/0x120
do_syscall_64+0xdd/0x4a0
entry_SYSCALL_64_after_hwframe+0x77/0x7f |
|---|
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|
| CNA |
Linux |
Linux |
affected fc5a409552be479715b147748f2f61b41b512976 22a9d0a9ba0c89be57558c1aa80dc60a571dd89c git |
Not specified |
| CNA |
Linux |
Linux |
affected 723f4ef90452aa629f3d923e92e0449d69362b1d d1f173d28e964ba2c3c4ebe7491d594dc8c77a40 git |
Not specified |
| CNA |
Linux |
Linux |
affected 723f4ef90452aa629f3d923e92e0449d69362b1d 2a302fdbaf7dd00d285303c94af8f48321c22993 git |
Not specified |
| CNA |
Linux |
Linux |
affected 723f4ef90452aa629f3d923e92e0449d69362b1d cb26524ef4ac28fcfa554c0656e8dc412c38a8ff git |
Not specified |
| CNA |
Linux |
Linux |
affected 430afd3edabf942a908570e5a41414bb455f15f8 git |
Not specified |
| CNA |
Linux |
Linux |
affected c9280c017ea13ff8678ef4f1ea78a4b683292e8b git |
Not specified |
| CNA |
Linux |
Linux |
affected 6.12.2 6.12.111 semver |
Not specified |
| CNA |
Linux |
Linux |
affected 6.6.64 6.7 semver |
Not specified |
| CNA |
Linux |
Linux |
affected 6.11.11 6.12 semver |
Not specified |
| CNA |
Linux |
Linux |
affected 6.13 |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.13 semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.12.111 6.12.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 6.18.53 6.18.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 7.2.7 7.2.* semver |
Not specified |
| CNA |
Linux |
Linux |
unaffected 7.3-rc3 * original_commit_for_fix |
Not specified |
References
| Reference | Source | Link | Tags |
|---|
| git.kernel.org/stable/c/2a302fdbaf7dd00d285303c94af8f48321c22993 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/d1f173d28e964ba2c3c4ebe7491d594dc8c77a40 |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/22a9d0a9ba0c89be57558c1aa80dc60a571dd89c |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| git.kernel.org/stable/c/cb26524ef4ac28fcfa554c0656e8dc412c38a8ff |
416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
git.kernel.org |
|
| CVE Program record |
CVE.ORG |
www.cve.org |
canonical |
| NVD vulnerability detail |
NVD |
nvd.nist.gov |
canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.