NVD / CVE Program· CNA Linux

CVE-2024-35854: mlxsw: spectrum_acl_tcam: Fix possible use-after-free during rehash

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: 0.57% (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 311eeaa7b9e26aba5b3d57b09859f07d8e9fc049, 4c89642ca47fb620914780c7c51d8d1248201121, 54225988889931467a9b55fdbef534079b665519; azl3 hyperv-daemons 6.6.29.1-1 on Azure Linux 3.0 6.6.35.1-1; azl3 hyperv-daemons 6.6.35.1-1 on Azure Linux 3.0 6.6.35.1-1.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 311eeaa7b9e26aba5b3d57b09859f07d8e9fc049, 4c89642ca47fb620914780c7c51d8d1248201121, 54225988889931467a9b55fdbef534079b665519; azl3 hyperv-daemons 6.6.29.1-1 on Azure Linux 3.0 6.6.35.1-1; azl3 hyperv-daemons 6.6.35.1-1 on Azure Linux 3.0 6.6.35.1-1 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: mlxsw: spectrum_acl_tcam: Fix possible use-after-free during rehash The rehash delayed work migrates filters from one region to another according to the number of available credits. The migrated from region is destroyed at the end of the work if the number of credits is non-negative as the assumption is that this is indicative of migration being complete. This assumption is incorrect as a non-negative number of credits can also be the result of a failed migration. The destruction of a region that still has filters referencing it can result in a use-after-free [1]. Fix by not destroying the region if migration failed. [1] BUG: KASAN: slab-use-after-free in mlxsw_sp_acl_ctcam_region_entry_remove+0x21d/0x230 Read of size 8 at addr ffff8881735319e8 by task kworker/0:31/3858 CPU: 0 PID: 3858 Comm: kworker/0:31 Tainted: G W 6.9.0-rc2-custom-00782-gf2275c2157d8 #5 Hardware name: Mellanox Technologies Ltd. MSN3700/VMOD0005, BIOS 5.11 01/06/2019 Workqueue: mlxsw_core mlxsw_sp_acl_tcam_vregion_rehash_work Call Trace: <TASK> dump_stack_lvl+0xc6/0x120 print_report+0xce/0x670 kasan_report+0xd7/0x110 mlxsw_sp_acl_ctcam_region_entry_remove+0x21d/0x230 mlxsw_sp_acl_ctcam_entry_del+0x2e/0x70 mlxsw_sp_acl_atcam_entry_del+0x81/0x210 mlxsw_sp_acl_tcam_vchunk_migrate_all+0x3cd/0xb50 mlxsw_sp_acl_tcam_vregion_rehash_work+0x157/0x1300 process_one_work+0x8eb/0x19b0 worker_thread+0x6c9/0xf70 kthread+0x2c9/0x3b0 ret_from_fork+0x4d/0x80 ret_from_fork_asm+0x1a/0x30 </TASK> Allocated by task 174: kasan_save_stack+0x33/0x60 kasan_save_track+0x14/0x30 __kasan_kmalloc+0x8f/0xa0 __kmalloc+0x19c/0x360 mlxsw_sp_acl_tcam_region_create+0xdf/0x9c0 mlxsw_sp_acl_tcam_vregion_rehash_work+0x954/0x1300 process_one_work+0x8eb/0x19b0 worker_thread+0x6c9/0xf70 kthread+0x2c9/0x3b0 ret_from_fork+0x4d/0x80 ret_from_fork_asm+0x1a/0x30 Freed by task 7: kasan_save_stack+0x33/0x60 kasan_save_track+0x14/0x30 kasan_save_free_info+0x3b/0x60 poison_slab_object+0x102/0x170 __kasan_slab_free+0x14/0x30 kfree+0xc1/0x290 mlxsw_sp_acl_tcam_region_destroy+0x272/0x310 mlxsw_sp_acl_tcam_vregion_rehash_work+0x731/0x1300 process_one_work+0x8eb/0x19b0 worker_thread+0x6c9/0xf70 kthread+0x2c9/0x3b0 ret_from_fork+0x4d/0x80 ret_from_fork_asm+0x1a/0x30

HighCVSS 7.8 · v3.1—No exploit Fix available

Memory safety

Published: May 17, 2024
Updated: Aug 5, 2026
EPSS: 0.5% · 47th percentile
CWE: CWE-416

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 31 / 40 · 7.8 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.5%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · Linux: 7.8; NVD has not scored this yet; the score shown is the CNA’s.

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
debian	debian linux	cpe:2.3:o:debian:debian_linux

Affected versions

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

debian debian linux10.0
linux linux kernel5.5 and later · before 5.10.216
linux linux kernel5.11 and later · before 5.15.158
linux linux kernel5.16 and later · before 6.1.90
linux linux kernel5.1 and later · before 5.4.275
linux linux kernel6.7 and later · before 6.8.9
linux linux kernel6.2 and later · before 6.6.30
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
- 5.1affected
- c9c9af91f1d9a636aecc55302c792538e549a430 and later · before e118e7ea24d1392878ef85926627c6bc640c4388affected · git
- c9c9af91f1d9a636aecc55302c792538e549a430 and later · before a429a912d6c779807f4d72a6cc0a1efaaa3613e1affected · git
- c9c9af91f1d9a636aecc55302c792538e549a430 and later · before 4c89642ca47fb620914780c7c51d8d1248201121affected · git
- c9c9af91f1d9a636aecc55302c792538e549a430 and later · before 813e2ab753a8f8c243a39ede20c2e0adc15f3887affected · git
- c9c9af91f1d9a636aecc55302c792538e549a430 and later · before 311eeaa7b9e26aba5b3d57b09859f07d8e9fc049affected · git
- c9c9af91f1d9a636aecc55302c792538e549a430 and later · before a02687044e124f8ccb427cd3632124a4e1a7d7c1affected · git
- c9c9af91f1d9a636aecc55302c792538e549a430 and later · before 54225988889931467a9b55fdbef534079b665519affected · git
- before 5.1not affected · semver
- 5.4.275 and later · up to and including 5.4.*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
Red Hat:rhel_eus:9.4::appstream	bpftool-debuginfo	before 0:7.3.0-427.61.1.el9_4	0:7.3.0-427.61.1.el9_4
Red Hat:rhel_eus:9.4::appstream	kernel-64k-debug-debuginfo	before 0:5.14.0-427.61.1.el9_4	0:5.14.0-427.61.1.el9_4
Red Hat:rhel_eus:9.4::appstream	kernel-64k-debug-devel	before 0:5.14.0-427.61.1.el9_4	0:5.14.0-427.61.1.el9_4
Red Hat:rhel_eus:9.4::appstream	kernel-64k-debug-devel-matched	before 0:5.14.0-427.61.1.el9_4	0:5.14.0-427.61.1.el9_4
Red Hat:rhel_eus:9.4::appstream	kernel-64k-debuginfo	before 0:5.14.0-427.61.1.el9_4	0:5.14.0-427.61.1.el9_4
Red Hat:rhel_eus:9.4::appstream	kernel-64k-devel	before 0:5.14.0-427.61.1.el9_4	0:5.14.0-427.61.1.el9_4
Red Hat:rhel_eus:9.4::appstream	kernel-64k-devel-matched	before 0:5.14.0-427.61.1.el9_4	0:5.14.0-427.61.1.el9_4
Red Hat:rhel_eus:9.4::appstream	kernel-debug-debuginfo	before 0:5.14.0-427.61.1.el9_4	0:5.14.0-427.61.1.el9_4
Red Hat:rhel_eus:9.4::appstream	kernel-debug-devel	before 0:5.14.0-427.61.1.el9_4	0:5.14.0-427.61.1.el9_4
Red Hat:rhel_eus:9.4::appstream	kernel-debug-devel-matched	before 0:5.14.0-427.61.1.el9_4	0:5.14.0-427.61.1.el9_4
Red Hat:rhel_eus:9.4::appstream	kernel-debuginfo	before 0:5.14.0-427.61.1.el9_4	0:5.14.0-427.61.1.el9_4
Red Hat:rhel_eus:9.4::appstream	kernel-debuginfo-common-aarch64	before 0:5.14.0-427.61.1.el9_4	0:5.14.0-427.61.1.el9_4
Red Hat:rhel_eus:9.4::appstream	kernel-debuginfo-common-ppc64le	before 0:5.14.0-427.61.1.el9_4	0:5.14.0-427.61.1.el9_4
Red Hat:rhel_eus:9.4::appstream	kernel-debuginfo-common-s390x	before 0:5.14.0-427.61.1.el9_4	0:5.14.0-427.61.1.el9_4
Red Hat:rhel_eus:9.4::appstream	kernel-debuginfo-common-x86_64	before 0:5.14.0-427.61.1.el9_4	0:5.14.0-427.61.1.el9_4
Red Hat:rhel_eus:9.4::appstream	kernel-devel	before 0:5.14.0-427.61.1.el9_4	0:5.14.0-427.61.1.el9_4
Red Hat:rhel_eus:9.4::appstream	kernel-devel-matched	before 0:5.14.0-427.61.1.el9_4	0:5.14.0-427.61.1.el9_4
Red Hat:rhel_eus:9.4::appstream	kernel-doc	before 0:5.14.0-427.61.1.el9_4	0:5.14.0-427.61.1.el9_4
Red Hat:rhel_eus:9.4::appstream	kernel-rt-debug-debuginfo	before 0:5.14.0-427.61.1.el9_4	0:5.14.0-427.61.1.el9_4
Red Hat:rhel_eus:9.4::appstream	kernel-rt-debuginfo	before 0:5.14.0-427.61.1.el9_4	0:5.14.0-427.61.1.el9_4
Red Hat:rhel_eus:9.4::appstream	kernel-tools-debuginfo	before 0:5.14.0-427.61.1.el9_4	0:5.14.0-427.61.1.el9_4
Red Hat:rhel_eus:9.4::appstream	kernel-zfcpdump-debuginfo	before 0:5.14.0-427.61.1.el9_4	0:5.14.0-427.61.1.el9_4

+56

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-2024-35852May 17, 2024 · mlxsw: spectrum_acl_tcam: Fix memory leak when canceling rehash work
22Monitor
← EarlierCVE-2024-35853May 17, 2024 · mlxsw: spectrum_acl_tcam: Fix memory leak during rehash
25Monitor
Later →CVE-2024-35855May 17, 2024 · mlxsw: spectrum_acl_tcam: Fix possible use-after-free during activity update
31Monitor

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	311eeaa7b9e26aba5b3d57b09859f07d8e9fc049	Vendor (CNA)
Linux Linux	4c89642ca47fb620914780c7c51d8d1248201121	Vendor (CNA)
Linux Linux	54225988889931467a9b55fdbef534079b665519	Vendor (CNA)
Linux Linux	813e2ab753a8f8c243a39ede20c2e0adc15f3887	Vendor (CNA)
Linux Linux	a02687044e124f8ccb427cd3632124a4e1a7d7c1	Vendor (CNA)
Linux Linux	a429a912d6c779807f4d72a6cc0a1efaaa3613e1	Vendor (CNA)
Linux Linux	e118e7ea24d1392878ef85926627c6bc640c4388	Vendor (CNA)
azl3 hyperv-daemons 6.6.29.1-1 on Azure Linux 3.0	6.6.35.1-1 · CBL-Mariner Releases	Microsoft (MSRC)
azl3 hyperv-daemons 6.6.35.1-1 on Azure Linux 3.0	6.6.35.1-1 · CBL-Mariner Releases	Microsoft (MSRC)
debian:linux	6.1.90-1 · Debian:12	Package registry (OSV)
red hat:bpftool-debuginfo	0:7.3.0-427.61.1.el9_4 · Red Hat:rhel_eus:9.4::appstream	Package registry (OSV)
red hat:kernel-64k-debug-debuginfo	0:5.14.0-427.61.1.el9_4 · Red Hat:rhel_eus:9.4::appstream	Package registry (OSV)
red hat:kernel-64k-debug-devel	0:5.14.0-427.61.1.el9_4 · Red Hat:rhel_eus:9.4::appstream	Package registry (OSV)
red hat:kernel-64k-debug-devel-matched	0:5.14.0-427.61.1.el9_4 · Red Hat:rhel_eus:9.4::appstream	Package registry (OSV)
red hat:kernel-64k-debuginfo	0:5.14.0-427.61.1.el9_4 · Red Hat:rhel_eus:9.4::appstream	Package registry (OSV)
red hat:kernel-64k-devel	0:5.14.0-427.61.1.el9_4 · Red Hat:rhel_eus:9.4::appstream	Package registry (OSV)
red hat:kernel-64k-devel-matched	0:5.14.0-427.61.1.el9_4 · Red Hat:rhel_eus:9.4::appstream	Package registry (OSV)
red hat:kernel-debug-debuginfo	0:5.14.0-427.61.1.el9_4 · Red Hat:rhel_eus:9.4::appstream	Package registry (OSV)
red hat:kernel-debug-devel	0:5.14.0-427.61.1.el9_4 · Red Hat:rhel_eus:9.4::appstream	Package registry (OSV)
red hat:kernel-debug-devel-matched	0:5.14.0-427.61.1.el9_4 · Red Hat:rhel_eus:9.4::appstream	Package registry (OSV)
red hat:kernel-debuginfo	0:5.14.0-427.61.1.el9_4 · Red Hat:rhel_eus:9.4::appstream	Package registry (OSV)
red hat:kernel-debuginfo-common-aarch64	0:5.14.0-427.61.1.el9_4 · Red Hat:rhel_eus:9.4::appstream	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.

No nightly-computed relations.

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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

TR-24-0506 · May 20, 2024(Linux Kernel Güncellemesi)

All national notices →

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-416 · Use After Free

CVSS vector

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

nvd-secondary

Root cause

After a memory region is freed, another reference pointing to it is still used. By then, the same region may have been allocated for different data.

The bug in code

The whole CWE-416 class

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

Vulnerable

1free(dev->buf);
2/* ... another thread is still running ... */
3process(dev->buf);

Fixed

1lock(&dev->lock);
2free(dev->buf);
3dev->buf = NULL;
4unlock(&dev->lock);

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.

Change log

Fix✗ → ✓Sep 28, 2026, 10:09 PM UTC

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

References

git.kernel.org/stable/c/311eeaa7b9e26aba5b3d57b09859f07d8e9fc049

Show all references (7 more)

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

All records