NVD / CVE Program· CNA Linux

CVE-2024-26936: ksmbd: validate request buffer size in smb2_allocate_rsp_buf()

Noroxi assessment

Priority: Monitor (action score 31/100)

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: 0.60% (FIRST EPSS).
Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
Fixed version: Linux Linux 17cf0c2794bdb6f39671265aa18aea5c22ee8c4a, 21ff9d7d223c5c19cb4334009e4c0c83a2f4d674, 2c27a64a2bc47d9bfc7c3cf8be14be53b1ee7cb6.

Low priority for now. Upgrade to Linux Linux 17cf0c2794bdb6f39671265aa18aea5c22ee8c4a, 21ff9d7d223c5c19cb4334009e4c0c83a2f4d674, 2c27a64a2bc47d9bfc7c3cf8be14be53b1ee7cb6 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: validate request buffer size in smb2_allocate_rsp_buf() The response buffer should be allocated in smb2_allocate_rsp_buf before validating request. But the fields in payload as well as smb2 header is used in smb2_allocate_rsp_buf(). This patch add simple buffer size validation to avoid potencial out-of-bounds in request buffer.

HighCVSS 7.8 · v3.1—No exploit Fix available

Memory safety

Published: May 1, 2024
Updated: Aug 5, 2026
EPSS: 0.6% · 49th percentile
CWE: CWE-120

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 31 / 40 · 7.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.6%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: 7.8
CNA · Linux: 8.2; 0.4 point gap

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
No public exploit code on record
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.

Vendor	Product	CPE
linux	linux kernel	cpe:2.3:o:linux:linux_kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

linux linux kernel5.15 and later · before 5.15.159
linux linux kernel5.16 and later · before 6.1.88
linux linux kernel6.2 and later · before 6.6.29
linux linux kernel6.7 and later · before 6.8.8
linux linux kernel6.9

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
- 5.15affected
- 0626e6641f6b467447c81dd7678a69c66f7746cf and later · before 8f3d0bf1d0c62b539d54c5b9108a845cff619b99affected · git
- 0626e6641f6b467447c81dd7678a69c66f7746cf and later · before 21ff9d7d223c5c19cb4334009e4c0c83a2f4d674affected · git
- 0626e6641f6b467447c81dd7678a69c66f7746cf and later · before 5c20b242d4fed73a93591e48bfd9772e2322fb11affected · git
- 0626e6641f6b467447c81dd7678a69c66f7746cf and later · before 2c27a64a2bc47d9bfc7c3cf8be14be53b1ee7cb6affected · git
- 0626e6641f6b467447c81dd7678a69c66f7746cf and later · before 17cf0c2794bdb6f39671265aa18aea5c22ee8c4aaffected · git
- before 5.15not affected · semver
- 5.15.159 and later · up to and including 5.15.*not affected · semver
- 6.1.88 and later · up to and including 6.1.*not affected · semver
- 6.6.29 and later · up to and including 6.6.*not affected · semver

Package-level exposure

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

Ecosystem	Package	Affected range	Fix
Debian:12	linux	before 6.1.90-1	6.1.90-1
Debian:13	linux	before 6.8.9-1	6.8.9-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
90Now
CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
89Now
CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
85Now

Published before and after this one in the same product

← EarlierCVE-2024-26932May 1, 2024 · usb: typec: tcpm: fix double-free issue in tcpm_port_unregister_pd()
31Monitor
← EarlierCVE-2024-26933May 1, 2024 · USB: core: Fix deadlock in port "disable" sysfs attribute
31Monitor
Later →CVE-2024-26938May 1, 2024 · drm/i915/bios: Tolerate devdata==NULL in intel_bios_encoder_supports_dp_dual_mode()
22Monitor

Remediation

Which version to upgrade to

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

Product / package	Fixed version	Source
Linux Linux	17cf0c2794bdb6f39671265aa18aea5c22ee8c4a	Vendor (CNA)
Linux Linux	21ff9d7d223c5c19cb4334009e4c0c83a2f4d674	Vendor (CNA)
Linux Linux	2c27a64a2bc47d9bfc7c3cf8be14be53b1ee7cb6	Vendor (CNA)
Linux Linux	5c20b242d4fed73a93591e48bfd9772e2322fb11	Vendor (CNA)
Linux Linux	8f3d0bf1d0c62b539d54c5b9108a845cff619b99	Vendor (CNA)
debian:linux	6.1.90-1 · Debian:12	Package 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.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

CVE-2023-44466215 days apartAn issue was discovered in net/ceph/messenger_v2.c in the Linux kernel before 6.4.5.
48Plan
CVE-2023-5273520 days apartbpf, sockmap: Don't let sock_map_{close,destroy,unhash} call itself
36Monitor
CVE-2024-269273 days apartASoC: SOF: Add some bounds checking to firmware data
33Monitor
CVE-2024-269520 days apartksmbd: fix potencial out-of-bounds when buffer offset is invalid
31Monitor
CVE-2024-270450 days apartdrm/amd/display: Fix a potential buffer overflow in 'dp_dsc_clock_en_read()'
31Monitor
CVE-2022-486573 days apartarm64: topology: fix possible overflow in amu_fie_setup()
31Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Someone with local access to the system can trigger it.
A low-privileged account is enough.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: high · data can be read
Integrity: high · data or configuration can be modified
Availability: high · the service can be disrupted

Attack vector: Local
Attack complexity: Low
Privileges required: Low
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: High

Weakness class (CWE)

CWE-120 · Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-primary

Root cause

When data is copied, the source length is not compared with the size of the destination buffer. Excess data overwrites adjacent memory.

The bug in code

The whole CWE-120 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1char buf[256];
2memcpy(buf, pkt->data, pkt->len);

Fixed

1char buf[256];
2if (pkt->len > sizeof(buf)) {
3  return -EINVAL;
4}
5memcpy(buf, pkt->data, pkt->len);

Attack context

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

Attack patterns (CAPEC)

ATT&CK techniques

—

Change log

Fix✗ → ✓Sep 28, 2026, 10:08 PM UTC

For records you follow, these changes also arrive as notifications. →

References

git.kernel.org/stable/c/17cf0c2794bdb6f39671265aa18aea5c22ee8c4a

Show all references (4 more)

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

All records