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No exploitation reportedFix availableAwaiting NVD analysis

CVE-2026-99277

ksmbd: hold a connection reference for each session channel

No exploitation reported by the sources we read.

  • Published2026-11-07
  • Fixed in7.3.2

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: hold a connection reference for each session channel ksmbd_session_unregister() removes a session from the global and per- connection tables before dropping the table reference. A concurrent reference holder can keep the session and its channel list alive after those removals. Connection cleanup can no longer find the unpublished session to remove its channels. Since a channel only stores a raw conn pointer, the connection can be freed while another session reference holder is still accessing it, for example during SMB3.1.1 binding or a procfs read. Take a connection reference when registering a channel and release it on insertion failure, channel removal, or final session destruction. Keep the channels and signing keys until the session is destroyed so a response can still be signed after the session has been unregistered.

Timeline

dates in UTC
  1. 2026-11-0714:08CVE publishedCNA

Versions per branch

OSV
Linux kernel
BranchAffectedFixed in
7.3≥ 7.3.0, < 7.3.27.3.2

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA2 products

As Linux, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Linuxother versions: not affected

    https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

    Affected
    • ≥ d7fd1f98607f2cd358e583f9548bdf0173090a86, < 4b333aed69cfc2c8687b86b6a4364a0dffc16dd8fixed in 4b333aed69cfc2c8687b86b6a4364a0dffc16dd8git
    • ≥ d7fd1f98607f2cd358e583f9548bdf0173090a86, < add8d7fb04efe564193df73581889c62fc0016f1fixed in add8d7fb04efe564193df73581889c62fc0016f1git
    • = c99ea7855124ca1428a1e59c2b4590aaef34eacfno fix statedgit
    • ≥ 7.2.8, < 7.3fixed in 7.3semver
  • Linuxother versions: affected

    https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

    Affected
    • = 7.3no fix stated

    Not affected < 7.3 · ≥ 7.3.2, ≤ 7.3.* · ≥ 7.4-rc1

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-11-07

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • linuxUbuntu:Pro:20.04:LTSall versions · no fixed version listedand 21 other packages
  • linuxUbuntu:Pro:18.04:LTSall versions · no fixed version listedand 12 other packages
  • linuxUbuntu:Pro:16.04:LTSall versions · no fixed version listedand 7 other packages
  • linuxUbuntu:Pro:14.04:LTSall versions · no fixed version listedand 3 other packages
  • linuxUbuntu:26.10all versions · no fixed version listedand 8 other packages
  • linuxUbuntu:26.04:LTSall versions · no fixed version listedand 13 other packages
  • linuxUbuntu:24.04:LTSall versions · no fixed version listedand 52 other packages
  • linuxUbuntu:22.04:LTSall versions · no fixed version listedand 59 other packages

17 more package ranges on OSV.dev

Full record on NVD

Fix

  1. Update Linux kernel to 7.3.2

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
Published
2026-11-07
Last Modified
2026-11-07
NVD status
Received
GitHub Advisory
GHSA-p59r-fqh3-3h8x

Frequently asked questions

What is CVE-2026-99277?

In the Linux kernel, the following vulnerability has been resolved: ksmbd: hold a connection reference for each session channel ksmbd_session_unregister() removes a session from the global and per- connection tables before dropping the table reference. A concurrent reference holder can keep the session and its channel list alive after those removals. Connection cleanup can no longer find the unpublished session to remove its channels. Since a channel only stores a raw conn pointer, the connection can be freed while another session reference holder is still accessing it, for example during SMB3.1.1 binding or a procfs read. Take a connection reference when registering a channel and release it on insertion failure, channel removal, or final session destruction. Keep the channels and signing keys until the session is destroyed so a response can still be signed after the session has been unregistered.

Is CVE-2026-99277 actively exploited?

Active exploitation of CVE-2026-99277 has not been confirmed. Its EPSS score was 0.1% on 2026-11-09, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-99277?

CVE-2026-99277 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H.

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