CVE-2026-97560

smb: client: fix one-byte OOB read in smb2_parse_native_symlink()

State: Published
Severity: Not scored
Published: Sep 25, 2026
Updated: Oct 19, 2026
Reserved: Sep 24, 2026

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

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	430afd3edabf942a908570e5a41414bb455f15f8 to before ff411fcbfc55eec1d66ea82483d254319dc8e973Affected fc5a409552be479715b147748f2f61b41b512976 to before 22a9d0a9ba0c89be57558c1aa80dc60a571dd89cAffected 723f4ef90452aa629f3d923e92e0449d69362b1d to before d1f173d28e964ba2c3c4ebe7491d594dc8c77a40Affected 723f4ef90452aa629f3d923e92e0449d69362b1d to before 2a302fdbaf7dd00d285303c94af8f48321c22993Affected 723f4ef90452aa629f3d923e92e0449d69362b1d to before cb26524ef4ac28fcfa554c0656e8dc412c38a8ffAffected c9280c017ea13ff8678ef4f1ea78a4b683292e8bAffected 6.6.64 to before 6.6.158Affected 6.12.2 to before 6.12.111Affected 6.11.11 to before 6.12Affected
LinuxLinux	6.13Affected before 6.13Not affected 6.6.158 through 6.6.Not affected 6.12.111 through 6.12.Not affected 6.18.53 through 6.18.Not affected 7.2.7 through 7.2.Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

430afd3edabf942a908570e5a41414bb455f15f8 to before ff411fcbfc55eec1d66ea82483d254319dc8e973Affected
fc5a409552be479715b147748f2f61b41b512976 to before 22a9d0a9ba0c89be57558c1aa80dc60a571dd89cAffected
723f4ef90452aa629f3d923e92e0449d69362b1d to before d1f173d28e964ba2c3c4ebe7491d594dc8c77a40Affected
723f4ef90452aa629f3d923e92e0449d69362b1d to before 2a302fdbaf7dd00d285303c94af8f48321c22993Affected
723f4ef90452aa629f3d923e92e0449d69362b1d to before cb26524ef4ac28fcfa554c0656e8dc412c38a8ffAffected
c9280c017ea13ff8678ef4f1ea78a4b683292e8bAffected
6.6.64 to before 6.6.158Affected
6.12.2 to before 6.12.111Affected
6.11.11 to before 6.12Affected

LinuxLinux

6.13Affected
before 6.13Not affected
6.6.158 through 6.6.*Not affected
6.12.111 through 6.12.*Not affected
6.18.53 through 6.18.*Not affected
7.2.7 through 7.2.*Not affected
7.3 and laterNot affected

References

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