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CVE-2026-98449

smb: client: delete compound mids on send failure before unlock

Products / packages Linux

Published

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Severity and exploitation

Not in CISA KEVNo CVSS score

KEV coverage does not rule out exploitation.

KEV checked 14/11/2026, 21:40:35 UTC

Severity

unknown

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

6 ranges
Linux version evidence

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

affected

ee258d79159afed52ca9372aeb9c1a51e89b32ee → before 36a2ba21d38a86bae84441e4c8d5b10653ef341a

git versions

ee258d79159afed52ca9372aeb9c1a51e89b32ee → before 59d30bdc3dd6fd3a8990f59bc7a137b1cbb3ed4e

git versions

ee258d79159afed52ca9372aeb9c1a51e89b32ee → before 70783946f3b5d0c06ec7df0f5e7bec2bfad24efb

git versions

ee258d79159afed52ca9372aeb9c1a51e89b32ee → before 8f6f8a48399f82f4a83f7b9f25b9707e0062a4f9

git versions

3c57a0be487088b08d9c88998f911eb4a7ba36e4

git versions

4.20.11 → before 4.21

semver versions

unaffected

unknown

Other versions: unaffected

Linux · Linux

Linux

6 ranges
Linux version evidence

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

affected

5.0

unaffected

0 → before 5.0

semver versions

6.12.117 → through 6.12.*

semver versions

6.18.61 → through 6.18.*

semver versions

7.2.9 → 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: delete compound mids on send failure before unlock

When sending a compound request fails, smb_send_rqst() kicks off a reconnect. compound_send_recv() still has those mids on pending_mid_q, but it unlocks the server without removing them first.

During reconnect, cifs_abort_connection() walks pending_mid_q and runs each mid callback. With no response yet, those callbacks return credits and drop in_flight. Then compound_send_recv()'s send-error path returns the same credits again. in_flight ends up decremented twice and smb2_add_credits() WARNs.

syzbot hits this during SMB2_negotiate when the socket send fails.

cifs_call_async() already calls delete_mid() before unlock on send failure. Do the same for compound chains and set cancelled_mid[] so the out: path does not delete them again.

References

4 sources
git.kernel.org/stable/c/36a2ba21d38a86bae84441e4c8d5b10653ef341a
Source referenceLinux
git.kernel.org/stable/c/59d30bdc3dd6fd3a8990f59bc7a137b1cbb3ed4e
Source referenceLinux
git.kernel.org/stable/c/70783946f3b5d0c06ec7df0f5e7bec2bfad24efb
Source referenceLinux
git.kernel.org/stable/c/8f6f8a48399f82f4a83f7b9f25b9707e0062a4f9
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-2026-98449

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): 5.0

Before: 6.12.117

Vulnerable product

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

From (inclusive): 5.0

Before: 6.18.61

Vulnerable product

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

From (inclusive): 5.0

Before: 7.2.9

Vulnerable product

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

From (inclusive): 5.0

Before: 7.3

Vulnerable product

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

From (inclusive): 4.20.11

Applicability preview
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Contributing organizations · 1
Linux

Assigning organization

2026-11-10

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
  1. CVE · CVE-2026-98449

    Observed 2026-11-10T18:25:05.778Z · upstream updated 2026-11-10T18:15:14.034Z

    Product or version evidence changed

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    References changed

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    after

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    Environment requirements changed

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    after

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

Showing up to 50 most recent observed changes.