CVE-2026-97560 (GCVE-0-2026-97560)
Vulnerability from cvelistv5
Published
2026-09-25 10:21
Modified
2026-10-19 09:09
Severity ?
Summary
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
References
Impacted products
Vendor Product Version
Linux Linux Version: 430afd3edabf942a908570e5a41414bb455f15f8
Version: fc5a409552be479715b147748f2f61b41b512976
Version: 723f4ef90452aa629f3d923e92e0449d69362b1d
Version: 723f4ef90452aa629f3d923e92e0449d69362b1d
Version: 723f4ef90452aa629f3d923e92e0449d69362b1d
Version: c9280c017ea13ff8678ef4f1ea78a4b683292e8b
Version: 6.6.64   ≤
Version: 6.12.2   ≤
Version: 6.11.11   ≤
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/reparse.c"
          ],
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          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.13"
            },
            {
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.12.111",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.53",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.158",
                  "versionStartIncluding": "6.6.64",
                  "vulnerable": true
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                {
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                  "versionEndExcluding": "6.12.111",
                  "versionStartIncluding": "6.12.2",
                  "vulnerable": true
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                {
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              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix one-byte OOB read in smb2_parse_native_symlink()\n\nWhen parsing a share-root relative native symlink, memcpy copies\nsmb_target+1 (skipping the leading separator) but uses\nstrlen(smb_target)+1 as the length, reading one byte past the\nallocated buffer.\n\nThis fixes the following KASAN splat when accessing an SMB symlink\nwith a target of \u0027\\a\\b\u0027:\n\n  BUG: KASAN: slab-out-of-bounds in smb2_parse_native_symlink+0x4f5/0xca0\n  Read of size 5 at addr ffff88800878fe21 by task netfsfuzz-execu/1\n  CPU: 1 UID: 0 PID: 1 Comm: netfsfuzz-execu Tainted: G N\n  7.2.0-11943-g2709dd5ae32f-dirty #1 PREEMPT(lazy)\n  Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix,\n  1996)\n  Call Trace:\n   \u003cTASK\u003e\n   dump_stack_lvl+0x7b/0xa0\n   print_report+0xd0/0x630\n   kasan_report+0xe5/0x120\n   kasan_check_range+0x105/0x1b0\n   __asan_memcpy+0x23/0x60\n   smb2_parse_native_symlink+0x4f5/0xca0\n   parse_reparse_point+0x68a/0x1530\n   reparse_info_to_fattr+0x752/0xa20\n   cifs_get_fattr+0x873/0x15b0\n   cifs_get_inode_info+0xc0/0x310\n   cifs_lookup+0x308/0xa70\n   __lookup_slow+0x122/0x2b0\n   lookup_slow+0x50/0x70\n   path_lookupat+0x525/0xaf0\n   filename_lookup+0x1f2/0x550\n   vfs_statx+0xd1/0x1a0\n   vfs_fstatat+0x65/0xc0\n   __do_sys_newfstatat+0x9a/0x120\n   do_syscall_64+0xdd/0x4a0\n   entry_SYSCALL_64_after_hwframe+0x77/0x7f"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:09:23.264Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ff411fcbfc55eec1d66ea82483d254319dc8e973"
        },
        {
          "url": "https://git.kernel.org/stable/c/22a9d0a9ba0c89be57558c1aa80dc60a571dd89c"
        },
        {
          "url": "https://git.kernel.org/stable/c/d1f173d28e964ba2c3c4ebe7491d594dc8c77a40"
        },
        {
          "url": "https://git.kernel.org/stable/c/2a302fdbaf7dd00d285303c94af8f48321c22993"
        },
        {
          "url": "https://git.kernel.org/stable/c/cb26524ef4ac28fcfa554c0656e8dc412c38a8ff"
        }
      ],
      "title": "smb: client: fix one-byte OOB read in smb2_parse_native_symlink()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-97560",
    "datePublished": "2026-09-25T10:21:49.462Z",
    "dateReserved": "2026-09-24T16:01:01.155Z",
    "dateUpdated": "2026-10-19T09:09:23.264Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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