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

Unknown severity · Source severity not reportedCVE-2026-97560

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

Answer in brief

CVE-2026-97560 records a Unknown severity vulnerability in smb: client: fix one-byte OOB read in smb2_parse_native_symlink(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 25, 2026Updated Sep 25, 2026Source checked Sep 25, 2026First seen by HOL Sep 25, 2026Material review Sep 25, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=fc5a409552be479715b147748f2f61b41b512976 <22a9d0a9ba0c89be57558c1aa80dc60a571dd89c \|\| >=723f4ef90452aa629f3d923e92e0449d69362b1d <d1f173d28e964ba2c3c4ebe7491d594dc8c77a40 \|\| >=723f4ef90452aa629f3d923e92e0449d69362b1d <2a302fdbaf7dd00d285303c94af8f48321c22993 \|\| >=723f4ef90452aa629f3d923e92e0449d69362b1d <cb26524ef4ac28fcfa554c0656e8dc412c38a8ff \|\| 430afd3edabf942a908570e5a41414bb455f15f8 \|\| c9280c017ea13ff8678ef4f1ea78a4b683292e8b \|\| >=6.12.2 <6.12.111 \|\| >=6.6.64 <6.7 \|\| >=6.11.11 <6.12	22a9d0a9ba0c89be57558c1aa80dc60a571dd89c, d1f173d28e964ba2c3c4ebe7491d594dc8c77a40, 2a302fdbaf7dd00d285303c94af8f48321c22993, cb26524ef4ac28fcfa554c0656e8dc412c38a8ff, 6.12.111, 6.7, 6.12
Linux/Linuxgeneric	6.13	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 22a9d0a9ba0c89be57558c1aa80dc60a571dd89c if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 25, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 25, 2026

Sources and claim methodology

Upstream source 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

Quoted source text, attributed separately from HOL analysis.