Action not permitted
Modal body text goes here.
Modal Title
Modal Body
EUVD-2026-345674
European Vulnerability Database identifier assigned by ENISAReserved
2026-10-02 08:03
Assigner
ENISA
Alias of
a CVE record, shown under related vulnerabilities.
This identifier carries no description, severity or references of its own:
they belong to that CVE.
{
"assigner": "ENISA",
"date_reserved": "2026-10-02T08:03:37.972091+00:00",
"id": "EUVD-2026-345674"
}
CVE-2024-35855 (GCVE-0-2024-35855)
Vulnerability from cvelistv5 – Published: 2024-05-17 14:47 – Updated: 2026-08-05 11:30
VLAI
EPSS
VEX
Title
mlxsw: spectrum_acl_tcam: Fix possible use-after-free during activity update
Summary
In the Linux kernel, the following vulnerability has been resolved:
mlxsw: spectrum_acl_tcam: Fix possible use-after-free during activity update
The rule activity update delayed work periodically traverses the list of
configured rules and queries their activity from the device.
As part of this task it accesses the entry pointed by 'ventry->entry',
but this entry can be changed concurrently by the rehash delayed work,
leading to a use-after-free [1].
Fix by closing the race and perform the activity query under the
'vregion->lock' mutex.
[1]
BUG: KASAN: slab-use-after-free in mlxsw_sp_acl_tcam_flower_rule_activity_get+0x121/0x140
Read of size 8 at addr ffff8881054ed808 by task kworker/0:18/181
CPU: 0 PID: 181 Comm: kworker/0:18 Not tainted 6.9.0-rc2-custom-00781-gd5ab772d32f7 #2
Hardware name: Mellanox Technologies Ltd. MSN3700/VMOD0005, BIOS 5.11 01/06/2019
Workqueue: mlxsw_core mlxsw_sp_acl_rule_activity_update_work
Call Trace:
<TASK>
dump_stack_lvl+0xc6/0x120
print_report+0xce/0x670
kasan_report+0xd7/0x110
mlxsw_sp_acl_tcam_flower_rule_activity_get+0x121/0x140
mlxsw_sp_acl_rule_activity_update_work+0x219/0x400
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 1039:
kasan_save_stack+0x33/0x60
kasan_save_track+0x14/0x30
__kasan_kmalloc+0x8f/0xa0
__kmalloc+0x19c/0x360
mlxsw_sp_acl_tcam_entry_create+0x7b/0x1f0
mlxsw_sp_acl_tcam_vchunk_migrate_all+0x30d/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
Freed by task 1039:
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_vchunk_migrate_all+0x3d7/0xb50
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
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-05-17 16:58 UTC
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
2bffc5322fd8679e879cd6370881ee50cf141ada , < 1b73f6e4ea770410a937a8db98f77e52594d23a0
(git)
Affected: 2bffc5322fd8679e879cd6370881ee50cf141ada , < e24d2487424779c02760ff50cd9021b8676e19ef (git) Affected: 2bffc5322fd8679e879cd6370881ee50cf141ada , < c17976b42d546ee118ca300db559630ee96fb758 (git) Affected: 2bffc5322fd8679e879cd6370881ee50cf141ada , < b996e8699da810e4c915841d6aaef761007f933a (git) Affected: 2bffc5322fd8679e879cd6370881ee50cf141ada , < feabdac2057e863d0e140a2adf3d232eb4882db4 (git) Affected: 2bffc5322fd8679e879cd6370881ee50cf141ada , < b183b915beef818a25e3154d719ca015a1ae0770 (git) Affected: 2bffc5322fd8679e879cd6370881ee50cf141ada , < 79b5b4b18bc85b19d3a518483f9abbbe6d7b3ba4 (git) |
|
| Linux | Linux |
Affected:
5.1
Unaffected: 0 , < 5.1 (semver) Unaffected: 5.4.275 , ≤ 5.4.* (semver) Unaffected: 5.10.216 , ≤ 5.10.* (semver) Unaffected: 5.15.158 , ≤ 5.15.* (semver) Unaffected: 6.1.90 , ≤ 6.1.* (semver) Unaffected: 6.6.30 , ≤ 6.6.* (semver) Unaffected: 6.8.9 , ≤ 6.8.* (semver) Unaffected: 6.9 , ≤ * (original_commit_for_fix) |
{
"containers": {
"adp": [
{
"metrics": [
{
"other": {
"content": {
"id": "CVE-2024-35855",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2024-05-17T16:58:00.643012Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"providerMetadata": {
"dateUpdated": "2024-06-04T17:33:37.309Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
},
{
"providerMetadata": {
"dateUpdated": "2024-08-02T03:21:48.376Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/1b73f6e4ea770410a937a8db98f77e52594d23a0"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/e24d2487424779c02760ff50cd9021b8676e19ef"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/c17976b42d546ee118ca300db559630ee96fb758"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/b996e8699da810e4c915841d6aaef761007f933a"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/feabdac2057e863d0e140a2adf3d232eb4882db4"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/b183b915beef818a25e3154d719ca015a1ae0770"
},
{
"tags": [
"x_transferred"
],
"url": "https://git.kernel.org/stable/c/79b5b4b18bc85b19d3a518483f9abbbe6d7b3ba4"
},
{
"tags": [
"x_transferred"
],
"url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html"
}
],
"title": "CVE Program Container"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "1b73f6e4ea770410a937a8db98f77e52594d23a0",
"status": "affected",
"version": "2bffc5322fd8679e879cd6370881ee50cf141ada",
"versionType": "git"
},
{
"lessThan": "e24d2487424779c02760ff50cd9021b8676e19ef",
"status": "affected",
"version": "2bffc5322fd8679e879cd6370881ee50cf141ada",
"versionType": "git"
},
{
"lessThan": "c17976b42d546ee118ca300db559630ee96fb758",
"status": "affected",
"version": "2bffc5322fd8679e879cd6370881ee50cf141ada",
"versionType": "git"
},
{
"lessThan": "b996e8699da810e4c915841d6aaef761007f933a",
"status": "affected",
"version": "2bffc5322fd8679e879cd6370881ee50cf141ada",
"versionType": "git"
},
{
"lessThan": "feabdac2057e863d0e140a2adf3d232eb4882db4",
"status": "affected",
"version": "2bffc5322fd8679e879cd6370881ee50cf141ada",
"versionType": "git"
},
{
"lessThan": "b183b915beef818a25e3154d719ca015a1ae0770",
"status": "affected",
"version": "2bffc5322fd8679e879cd6370881ee50cf141ada",
"versionType": "git"
},
{
"lessThan": "79b5b4b18bc85b19d3a518483f9abbbe6d7b3ba4",
"status": "affected",
"version": "2bffc5322fd8679e879cd6370881ee50cf141ada",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_tcam.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.1"
},
{
"lessThan": "5.1",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"version": "5.4.275",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.216",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.158",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.90",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.30",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.8.*",
"status": "unaffected",
"version": "6.8.9",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.9",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.4.275",
"versionStartIncluding": "5.1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.216",
"versionStartIncluding": "5.1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.158",
"versionStartIncluding": "5.1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.90",
"versionStartIncluding": "5.1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.30",
"versionStartIncluding": "5.1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.8.9",
"versionStartIncluding": "5.1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.9",
"versionStartIncluding": "5.1",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmlxsw: spectrum_acl_tcam: Fix possible use-after-free during activity update\n\nThe rule activity update delayed work periodically traverses the list of\nconfigured rules and queries their activity from the device.\n\nAs part of this task it accesses the entry pointed by \u0027ventry-\u003eentry\u0027,\nbut this entry can be changed concurrently by the rehash delayed work,\nleading to a use-after-free [1].\n\nFix by closing the race and perform the activity query under the\n\u0027vregion-\u003elock\u0027 mutex.\n\n[1]\nBUG: KASAN: slab-use-after-free in mlxsw_sp_acl_tcam_flower_rule_activity_get+0x121/0x140\nRead of size 8 at addr ffff8881054ed808 by task kworker/0:18/181\n\nCPU: 0 PID: 181 Comm: kworker/0:18 Not tainted 6.9.0-rc2-custom-00781-gd5ab772d32f7 #2\nHardware name: Mellanox Technologies Ltd. MSN3700/VMOD0005, BIOS 5.11 01/06/2019\nWorkqueue: mlxsw_core mlxsw_sp_acl_rule_activity_update_work\nCall Trace:\n \u003cTASK\u003e\n dump_stack_lvl+0xc6/0x120\n print_report+0xce/0x670\n kasan_report+0xd7/0x110\n mlxsw_sp_acl_tcam_flower_rule_activity_get+0x121/0x140\n mlxsw_sp_acl_rule_activity_update_work+0x219/0x400\n process_one_work+0x8eb/0x19b0\n worker_thread+0x6c9/0xf70\n kthread+0x2c9/0x3b0\n ret_from_fork+0x4d/0x80\n ret_from_fork_asm+0x1a/0x30\n \u003c/TASK\u003e\n\nAllocated by task 1039:\n kasan_save_stack+0x33/0x60\n kasan_save_track+0x14/0x30\n __kasan_kmalloc+0x8f/0xa0\n __kmalloc+0x19c/0x360\n mlxsw_sp_acl_tcam_entry_create+0x7b/0x1f0\n mlxsw_sp_acl_tcam_vchunk_migrate_all+0x30d/0xb50\n mlxsw_sp_acl_tcam_vregion_rehash_work+0x157/0x1300\n process_one_work+0x8eb/0x19b0\n worker_thread+0x6c9/0xf70\n kthread+0x2c9/0x3b0\n ret_from_fork+0x4d/0x80\n ret_from_fork_asm+0x1a/0x30\n\nFreed by task 1039:\n kasan_save_stack+0x33/0x60\n kasan_save_track+0x14/0x30\n kasan_save_free_info+0x3b/0x60\n poison_slab_object+0x102/0x170\n __kasan_slab_free+0x14/0x30\n kfree+0xc1/0x290\n mlxsw_sp_acl_tcam_vchunk_migrate_all+0x3d7/0xb50\n mlxsw_sp_acl_tcam_vregion_rehash_work+0x157/0x1300\n process_one_work+0x8eb/0x19b0\n worker_thread+0x6c9/0xf70\n kthread+0x2c9/0x3b0\n ret_from_fork+0x4d/0x80\n ret_from_fork_asm+0x1a/0x30"
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The vulnerable state is set up by installing tc flower filters on an mlxsw switch port via rtnetlink (RTM_NEWTFILTER), a local syscall interface; remote traffic only toggles the hardware activity bit and cannot influence the `ventry-\u003eentry` lifetime. No network-facing parser or protocol handler is on the path.\nAC:L - The attacker controls both sides of the race \u2014 rule add/delete churn resets the rehash context and keeps `mlxsw_sp_acl_tcam_ventry_migrate()` continuously freeing entries (credit budget of 100 forces immediate reschedule), while the unlocked activity walker re-scans every rule once per second with a slow per-rule firmware query, giving a wide window that repeats indefinitely. The bug reproduced in real deployments, and the rehash interval is additionally attacker-tunable via the `acl_region_rehash_interval` devlink param.\nPR:L - Installing offloaded flower rules requires CAP_NET_ADMIN in the netns owning the mlxsw netdev, which per kernel CNA convention is scored as low privilege; mlxsw ports are routinely delegated into network namespaces in containerized switch OSes, where a non-root user holding CAP_NET_ADMIN in that namespace can install the filters.\nUI:N - The attacker triggers everything themselves by configuring tc flower rules; the two racing kernel delayed works then fire automatically on their own timers with no victim action required.\nS:U - The use-after-free corrupts kernel heap memory and is exploited within the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - A use-after-free on a general kmalloc-cache object that is pointer-chased (`entry-\u003echunk-\u003eregion-\u003epriv`, `entry-\u003eact_block`) lets an attacker who reclaims the slab redirect reads to arbitrary kernel addresses, yielding an arbitrary-read primitive and disclosure of kernel memory and pointers.\nI:H - The freed object feeds `mlxsw_afa_block_activity_get()`, which performs an indirect call via `block-\u003eafa-\u003eops-\u003ekvdl_set_activity_get` \u2014 three pointer levels all sourced from the freed allocation \u2014 so heap spraying the reclaimed slab gives control-flow hijack and hence arbitrary kernel modification.\nA:H - Even unweaponized, the use-after-free dereferences stale pointers from a kernel workqueue context, producing an oops/panic (as captured in the KASAN report) and taking down the switch\u0027s control plane."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T11:30:19.765Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/1b73f6e4ea770410a937a8db98f77e52594d23a0"
},
{
"url": "https://git.kernel.org/stable/c/e24d2487424779c02760ff50cd9021b8676e19ef"
},
{
"url": "https://git.kernel.org/stable/c/c17976b42d546ee118ca300db559630ee96fb758"
},
{
"url": "https://git.kernel.org/stable/c/b996e8699da810e4c915841d6aaef761007f933a"
},
{
"url": "https://git.kernel.org/stable/c/feabdac2057e863d0e140a2adf3d232eb4882db4"
},
{
"url": "https://git.kernel.org/stable/c/b183b915beef818a25e3154d719ca015a1ae0770"
},
{
"url": "https://git.kernel.org/stable/c/79b5b4b18bc85b19d3a518483f9abbbe6d7b3ba4"
}
],
"title": "mlxsw: spectrum_acl_tcam: Fix possible use-after-free during activity update",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2024-35855",
"datePublished": "2024-05-17T14:47:31.436Z",
"dateReserved": "2024-05-17T13:50:33.106Z",
"dateUpdated": "2026-08-05T11:30:19.765Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
Loading…
Trend slope:
-
(linear fit over daily sighting counts)
Show additional events:
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Loading…
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Loading…
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
Loading…
Loading…