CVE-2024-35855mlxsw: spectrum_acl_tcam: Fix possible use-after-free during activity update
- 7.8HighCVSS base score
- 0.23%Exploitation in 30 daysEPSS · top 86% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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
Timeline
ID reserved
By Linux
Published
- 2 years later
· 2 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.23% · top 86% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 2bffc5322fd8679e879cd6370881ee50cf141ada – < 1b73f6e4ea770410a937a8db98f77e52594d23a0
- affected 2bffc5322fd8679e879cd6370881ee50cf141ada – < e24d2487424779c02760ff50cd9021b8676e19ef
- affected 2bffc5322fd8679e879cd6370881ee50cf141ada – < c17976b42d546ee118ca300db559630ee96fb758
- affected 2bffc5322fd8679e879cd6370881ee50cf141ada – < b996e8699da810e4c915841d6aaef761007f933a
- affected 2bffc5322fd8679e879cd6370881ee50cf141ada – < feabdac2057e863d0e140a2adf3d232eb4882db4
- affected 2bffc5322fd8679e879cd6370881ee50cf141ada – < b183b915beef818a25e3154d719ca015a1ae0770
- affected 2bffc5322fd8679e879cd6370881ee50cf141ada – < 79b5b4b18bc85b19d3a518483f9abbbe6d7b3ba4
- affected 5.1
- unaffected < 5.1
- unaffected 5.4.275 – ≤ 5.4.*
- unaffected 5.10.216 – ≤ 5.10.*
- unaffected 5.15.158 – ≤ 5.15.*
- unaffected 6.1.90 – ≤ 6.1.*
- unaffected 6.6.30 – ≤ 6.6.*
- unaffected 6.8.9 – ≤ 6.8.*
- unaffected 6.9 – ≤ *
References
References8
- https://git.kernel.org/stable/c/1b73f6e4ea770410a937a8db98f77e52594d23a0 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/e24d2487424779c02760ff50cd9021b8676e19ef (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/c17976b42d546ee118ca300db559630ee96fb758 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/b996e8699da810e4c915841d6aaef761007f933a (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/feabdac2057e863d0e140a2adf3d232eb4882db4 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/b183b915beef818a25e3154d719ca015a1ae0770 (opens in a new tab)x_transferred
- https://git.kernel.org/stable/c/79b5b4b18bc85b19d3a518483f9abbbe6d7b3ba4 (opens in a new tab)x_transferred
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html (opens in a new tab)x_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2024-35573 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2024-35855)Record last updated .