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CVE-2026-98171

smb: client: fix next_buffer UAF and NextCommand bounds in compound PDUs

Products / packages Linux

Published

Share

Severity and exploitation

Not in CISA KEV

KEV coverage does not rule out exploitation.

KEV checked 14/11/2026, 21:45:32 UTC
Linux · CVSS:3.1 · 8.8
Assessment vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Severity

high8.8

CVSS measures technical severity, not the likelihood of an attack.

Known exploitation

Not listed in the checked CISA KEV catalog

Absence from CISA KEV does not rule out attacks.

Public exploit

Not established by this record

Missing evidence does not mean no public exploit exists.

Remediation

Fix status not established

No structured fix or guidance is available here. Check the latest publisher advisory.

What this means

In the Linux kernel, the following vulnerability has been resolved:

Source excerpt · Linux

Attack conditions

No attack-condition excerpt has been identified here. Review the full source description and references for authentication, network access, and configuration requirements.

Review supporting sources →

Affected versions

Check the exact model, release, and any platform requirements against your installation.

Linux · Linux

Linux

8 ranges
Linux version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

b24df3e30cbf48255db866720fb71f14bf9d2f39 → before 1ed29f7a03417b405f38c09cfe04124883127b53

git versions

b24df3e30cbf48255db866720fb71f14bf9d2f39 → before 7f022867ec9f0166a0b4400385bb601b1c6b2c75

git versions

b24df3e30cbf48255db866720fb71f14bf9d2f39 → before 72eaef1f37a3b6bec11c342736834dc3707be3e4

git versions

b24df3e30cbf48255db866720fb71f14bf9d2f39 → before 491e33144dee872cffda207f6fcb09260728f803

git versions

b24df3e30cbf48255db866720fb71f14bf9d2f39 → before 8749946579708ea0d339034bb7f423a67dbe89cf

git versions

b24df3e30cbf48255db866720fb71f14bf9d2f39 → before 96c436e4b010711452b2872558938f4ef276492a

git versions

b24df3e30cbf48255db866720fb71f14bf9d2f39 → before 858d5ac22cb889266993e7670f9f0c4f4aeedd78

git versions

b24df3e30cbf48255db866720fb71f14bf9d2f39 → before 05762c5bc1cfdcac36747994fde2c04387a457f1

git versions

unaffected

unknown

Other versions: unaffected

Linux · Linux

Linux

10 ranges
Linux version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

4.19

unaffected

0 → before 4.19

semver versions

5.10.273 → through 5.10.*

semver versions

5.15.224 → through 5.15.*

semver versions

6.1.189 → through 6.1.*

semver versions

6.6.158 → through 6.6.*

semver versions

6.12.112 → through 6.12.*

semver versions

6.18.54 → through 6.18.*

semver versions

7.2.8 → through 7.2.*

semver versions

7.3 → through *

original_commit_for_fix versions

unknown

Other versions: affected

Automatic dependency matching is unavailable for this record. Use the product evidence and publisher’s instructions to check your installation.

What to do

Compare your installed product and version with the affected versions above. A matching product name alone does not confirm exposure.

No structured fix or remediation guidance is available here. Check the full source description and vendor’s latest advisory for a patch or workaround; do not assume another version is safe.

cve.new guidance unless attributed to a publisher. This page does not inspect your installation.

Public exploit evidence

No public exploit reference is identified in the imported evidence. This is not a claim that no exploit exists.

Original source description

Read the full publisher description

In the Linux kernel, the following vulnerability has been resolved:

smb: client: fix next_buffer UAF and NextCommand bounds in compound PDUs

Fix several related bounds checking and pointer lifecycle issues in receive_encrypted_standard()'s handling of compound encrypted frames:

  • Clear next_buffer after assigning it to server->bigbuf. A stale next_buffer pointer can lead to a use-after-free on subsequent error paths.
  • Update pdu_length to the decrypted plaintext size (buf_size). Using the pre-decryption length allows NextCommand to point into stale ciphertext residue.
  • Reject next_cmd values smaller than MID_HEADER_SIZE(server).
  • Fix an integer overflow in the upper bound check by verifying pdu_length - next_cmd < MID_HEADER_SIZE(server), ensuring the trailing slice is large enough for a header.

References

8 sources
git.kernel.org/stable/c/1ed29f7a03417b405f38c09cfe04124883127b53
Source referenceLinux
git.kernel.org/stable/c/7f022867ec9f0166a0b4400385bb601b1c6b2c75
Source referenceLinux
git.kernel.org/stable/c/72eaef1f37a3b6bec11c342736834dc3707be3e4
Source referenceLinux
git.kernel.org/stable/c/491e33144dee872cffda207f6fcb09260728f803
Source referenceLinux
git.kernel.org/stable/c/8749946579708ea0d339034bb7f423a67dbe89cf
Source referenceLinux
git.kernel.org/stable/c/96c436e4b010711452b2872558938f4ef276492a
Source referenceLinux
View 2 more references
git.kernel.org/stable/c/858d5ac22cb889266993e7670f9f0c4f4aeedd78
Source referenceLinux
git.kernel.org/stable/c/05762c5bc1cfdcac36747994fde2c04387a457f1
Source referenceLinux

Inside the record

Evidence available

Package identity · not supplied
Version evidence
Remediation guidance · not supplied
Weakness classification · not supplied
Additional publishers · not supplied

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-98171

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Environment requirements

These conditions apply together as specified by the publisher. A matching product name alone does not establish exposure.

Linux · platform conditions

Any condition may hold

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.19

Before: 5.10.273

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.19

Before: 5.15.224

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.19

Before: 6.1.189

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.19

Before: 6.6.158

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.19

Before: 6.12.112

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.19

Before: 6.18.54

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.19

Before: 7.2.8

Vulnerable product

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

From (inclusive): 4.19

Before: 7.3

Applicability preview
[
  {
    "nodes": [
      {
        "operator": "OR",
        "negate": false,
        "cpeMatch": [
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "4.19",
            "versionEndExcluding": "5.10.273"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "4.19",
            "versionEndExcluding": "5.15.224"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "4.19",
            "versionEndExcluding": "6.1.189"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "4.19",
            "versionEndExcluding": "6.6.158"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "4.19",
            "versionEndExcluding": "6.12.112"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "4.19",
            "versionEndExcluding": "6.18.54"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "4.19",
            "versionEndExcluding": "7.2.8"
          },
          {
            "vulnerable": true,
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionStartIncluding": "4.19",
            "versionEndExcluding": "7.3"
          }
        ]
      }
    ]
  }
]
Contributing organizations · 1
Linux

Assigning organization

2026-10-30

Timeline

All times UTC

  1. Advisory published

    Publication date supplied by the source.

  2. Source updated

    Latest modification date supplied by the source.

  3. Last imported by cve.new

    Latest catalog import, not the date we first saw this advisory.

What changed

Follow changes
No substantive changes have been recorded here yet. History starts when cve.new observes a change after tracking is enabled; earlier edits are not reconstructed.

Large field values are marked as truncated previews. Original source snapshots remain retained.