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CVE-2026-97560

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

Linux LinuxOperating systems
Open in ThreatlineRecord JSON
CVSS
NoneNot scored
ExploitationNo known exploitationNot in CISA KEV, which does not prove it is unexploitedCISA KEV
Exploit odds (EPSS)0.20%Chance of exploitation activity in the next 30 days, higher than 9% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed in22a9d0a9ba0c89be57558c1aa80dc60a571dd89cAlso 2a302fdbaf7dd00d285303c94af8f48321c22993, 6.6.158 and 2 moreCVE List
Published25 Sep 2026Updated 19 Oct 2026CVE List

What fixes it

A fixed version on one release line is not the upgrade target for every line. Check your exact version and any vendor backports.

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

Text from CVE List

Affected versions 16

  • Linuxaffected: 430afd3edabf942a908570e5a41414bb455f15f8 before ff411fcbfc55eec1d66ea82483d254319dc8e973CVE List
  • Linuxaffected: fc5a409552be479715b147748f2f61b41b512976 before 22a9d0a9ba0c89be57558c1aa80dc60a571dd89cCVE List
  • Linuxaffected: 723f4ef90452aa629f3d923e92e0449d69362b1d before d1f173d28e964ba2c3c4ebe7491d594dc8c77a40CVE List
  • Linuxaffected: 723f4ef90452aa629f3d923e92e0449d69362b1d before 2a302fdbaf7dd00d285303c94af8f48321c22993CVE List
  • Linuxaffected: 723f4ef90452aa629f3d923e92e0449d69362b1d before cb26524ef4ac28fcfa554c0656e8dc412c38a8ffCVE List
  • Linuxaffected: c9280c017ea13ff8678ef4f1ea78a4b683292e8bCVE List
  • Linuxaffected: 6.6.64 before 6.6.158CVE List
  • Linuxaffected: 6.12.2 before 6.12.111CVE List
  • Linuxaffected: 6.11.11 before 6.12CVE List
  • Linuxaffected: 6.13CVE List
  • Linuxunaffected: all versions before 6.13CVE List
  • Linuxunaffected: 6.6.158 through 6.6.*CVE List
  • Linuxunaffected: 6.12.111 through 6.12.*CVE List
  • Linuxunaffected: 6.18.53 through 6.18.*CVE List
  • Linuxunaffected: 7.2.7 through 7.2.*CVE List
  • Linuxunaffected: 7.3CVE List

References 5