CVE-2026-97560

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

N/A

Published: September 25, 2026 at 10:21 AM UTC

Updated: October 19, 2026 at 10:17 AM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

N/A

Exploit prediction

EPSS 0.2%

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

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

90%

430afd3edabf942a908570e5a41414bb455f15f86.11.11 6.12.2 6.13 6.6.64723f4ef90452aa629f3d923e92e0449d69362b1dc9280c017ea13ff8678ef4f1ea78a4b683292e8bfc5a409552be479715b147748f2f61b41b512976

Vendor states this is fixed in 22a9d0a9ba0c89be57558c1aa80dc60a571dd89c (fixed)

Vendor states this is fixed in 2a302fdbaf7dd00d285303c94af8f48321c22993 (fixed)

Vendor states this is fixed in cb26524ef4ac28fcfa554c0656e8dc412c38a8ff (fixed)

Vendor states this is fixed in d1f173d28e964ba2c3c4ebe7491d594dc8c77a40 (fixed)

Vendor states this is fixed in ff411fcbfc55eec1d66ea82483d254319dc8e973 (fixed)

Affected range stops below 6.12, so it looks safe — our inference, not a vendor statement

Vendor states this is fixed in 6.12.111 (unaffected)

Vendor states this is fixed in 6.13 (unaffected)

Vendor states this is fixed in 6.18.53 (unaffected)

Vendor states this is fixed in 6.6.158 (unaffected)

Vendor states this is fixed in 7.2.7 (unaffected)

Vendor states this is fixed in 7.3 (unaffected)