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NVD / CVE Program· CNA Linux

CVE-2026-93811: ksmbd: Fix acl.sd_buf memory leak and invalid sd_size error handling

—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.17% (FIRST EPSS).
  • Fixed version: Linux Linux 5.15.222, 5.19, 5.20.

Low priority for now. Upgrade to Linux Linux 5.15.222, 5.19, 5.20 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: ksmbd: Fix acl.sd_buf memory leak and invalid sd_size error handling 1. When ndr_decode_v4_ntacl() fails, the code jumped to free_n_data which only freed n.data, skipping kfree(acl.sd_buf) and leaking the buffer. Zero-initialize struct xattr_ntacl acl, reorder error labels to out_free to release acl.sd_buf on all error paths. 2. if (acl.sd_size < sizeof(struct smb_ntsd)) is true, original code returned success without freeing sd_buf and left stale *pntsd. Set rc = -EINVAL before jumping to out_free to return error code and free buffer.

Published
Sep 24, 2026
Updated
Oct 3, 2026
EPSS
0.1% · 6th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
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  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 6e8f4abf584253cbaa596ea4ad13110cf61cd4c9, 8e33102309bd6839b2e2e158f93a7b378cb4655d, 6.0affected
    • cb69d4d6f709f87c94afa28ae64c501576692171 and later · before f46a70a082bdbfecbe074af8a719c26c4deb58c6affected · git
    • 8f0541186e9ad1b62accc9519cc2b7a7240272a7 and later · before 86c2625fb9863139b359805fc6be1e31edbd3d65affected · git
    • 8f0541186e9ad1b62accc9519cc2b7a7240272a7 and later · before edc17db83085624a2b1bacf6a4521d7f15571737affected · git
    • 8f0541186e9ad1b62accc9519cc2b7a7240272a7 and later · before c3836f55e0dab96314774215e12d87f63fa919f2affected · git
    • 8f0541186e9ad1b62accc9519cc2b7a7240272a7 and later · before 6e6329322ad733c5b23555c609353841560b26bcaffected · git
    • 8f0541186e9ad1b62accc9519cc2b7a7240272a7 and later · before d708a36634bb7b6f94d0e76d587d2ec50b2b93b5affected · git
    • 5.15.62 and later · before 5.15.222affected · semver
    • 5.18.18 and later · before 5.19affected · semver
    • 5.19.2 and later · before 5.20affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.6-17.2.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-93808Sep 24, 2026 · ALSA: usb-audio: caiaq: validate EP1 reply lengths
    0Monitor
  • ← EarlierCVE-2026-93810Sep 24, 2026 · cachefiles: Fix double fput
    28Monitor
  • Later →CVE-2026-93812Sep 24, 2026 · ksmbd: fix sd_ndr.data memory leak in ksmbd_vfs_set_sd_xattr
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux5.15.222Vendor (CNA)
Linux Linux5.19Vendor (CNA)
Linux Linux5.20Vendor (CNA)
Linux Linux6e6329322ad733c5b23555c609353841560b26bcVendor (CNA)
Linux Linux86c2625fb9863139b359805fc6be1e31edbd3d65Vendor (CNA)
Linux Linuxc3836f55e0dab96314774215e12d87f63fa919f2Vendor (CNA)
Linux Linuxd708a36634bb7b6f94d0e76d587d2ec50b2b93b5Vendor (CNA)
Linux Linuxedc17db83085624a2b1bacf6a4521d7f15571737Vendor (CNA)
Linux Linuxf46a70a082bdbfecbe074af8a719c26c4deb58c6Vendor (CNA)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Not on record for this CVE: patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

References

Show all references (5 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

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