CVE-2024-38556: net/mlx5: Add a timeout to acquire the command queue semaphore
Vulnerability summary
CVE-2024-38556 is a high (CVSS 7.8) Improper Validation of Array Index vulnerability in linux. EPSS estimates a 0.26% chance of exploitation in the next 30 days, higher than 17.6% of scored vulnerabilities.
Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 18 · Related 13Timeline
- 19-06-2024PublishedVulnerability first disclosed.
- 05-08-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: net/mlx5: Add a timeout to acquire the command queue semaphore Prevent forced completion handling on an entry that has not yet been assigned an index, causing an out of bounds access on idx = -22. Instead of waiting indefinitely for the sem, blocking flow now waits for index to be allocated or a sem acquisition timeout before beginning the timer for FW completion. Kernel log example: mlx5_core 0000:06:00.0: wait_func_handle_exec_timeout:1128:(pid 185911): cmd[-22]: CREATE_UCTX(0xa04) No done completion
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- NVDNIST7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.26%
Chance of exploitation in the next 30 days
Percentile
18%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.26% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu125 products
- linuxAll versions (No fix recorded) | < 6.8.0-40.40
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 6.8.0-1013.14
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ 8e715cd613a1e872b9d918e912d90b399785761a, < 4baae687a20ef2b82fde12de3c04461e6f2521d6 | ≥ 8e715cd613a1e872b9d918e912d90b399785761a, < f9caccdd42e999b74303c9b0643300073ed5d319 | ≥ 8e715cd613a1e872b9d918e912d90b399785761a, < 2d0962d05c93de391ce85f6e764df895f47c8918 | ≥ 8e715cd613a1e872b9d918e912d90b399785761a, < 94024332a129c6e4275569d85c0c1bfb2ae2d71b | ≥ 8e715cd613a1e872b9d918e912d90b399785761a, < 485d65e1357123a697c591a5aeb773994b247ad7 | 74dd45122b84479eee50bd0956ae8bc5799c9f8a | e801f81cee3c8901f52ee48c6329802b28fbb49c | d73d81447c6651904dd4a9e3fd88651ff174c1b7 | 4646175c19fd019b773444a11ff62748eb83745b | ≥ 5.4.174, < 5.5 | ≥ 5.10.94, < 5.11 | ≥ 5.15.17, < 5.16 | ≥ 5.16.3, < 5.17 | 5.17
- linux_kernel≥ 5.4.174, < 5.5 | ≥ 5.10.94, < 5.11 | ≥ 5.15.17, < 5.16 | ≥ 5.16.3, ≤ 6.1.93 | ≥ 6.2, ≤ 6.6.33 | ≥ 6.7, ≤ 6.8.12 | ≥ 6.9, ≤ 6.9.3
Debian1 product
- linux< 6.1.94-1 | < 6.8.12-1
3 vendors · 128 products
