# CVE-2026-97560: smb: client: fix one-byte OOB read in smb2_parse_native_symlink()

> A one-byte out-of-bounds read in the Linux kernel SMB client allows attackers to cause a crash or leak memory when parsing specific symlinks.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 25 Sep 2026
- **Updated:** 19 Oct 2026
- **Also known as:** AZL-104187, BELL-CVE-2026-97560, DEBIAN-CVE-2026-97560, GHSA-xc88-j6q5-vwwx, UBUNTU-CVE-2026-97560

## What is CVE-2026-97560?

CVE-2026-97560 is a memory corruption vulnerability in Linux, published on 25 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official 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

## Which versions are affected by CVE-2026-97560?


## How do I fix CVE-2026-97560?

Apply the vendor's patch.

## Is CVE-2026-97560 being exploited?

There is no known exploitation of CVE-2026-97560 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-97560 and fix it if it is affected.

What it is: CVE-2026-97560 is a memory corruption vulnerability in Linux, published on 25 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-97560 in the wild and no public exploit code.

Affected product: Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-97560/ (Markdown: https://insights.sbomify.com/CVE-2026-97560/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-97560
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-97560
- OSV: https://osv.dev/vulnerability/CVE-2026-97560

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-97560/
Summaries are generated and may contain mistakes; the official description above is the record.