CVE-2024-56700: linux NULL Pointer Dereference
Vulnerability summary
CVE-2024-56700 is a medium (CVSS 5.5) NULL Pointer Dereference vulnerability in linux. EPSS estimates a 0.22% chance of exploitation in the next 30 days, higher than 11.6% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 43 · Related 43Timeline
- 28-12-2024PublishedVulnerability first disclosed.
- 11-05-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: media: wl128x: Fix atomicity violation in fmc_send_cmd() Atomicity violation occurs when the fmc_send_cmd() function is executed simultaneously with the modification of the fmdev->resp_skb value. Consider a scenario where, after passing the validity check within the function, a non-null fmdev->resp_skb variable is assigned a null value. This results in an invalid fmdev->resp_skb variable passing the validity check. As seen in the later part of the function, skb = fmdev->resp_skb; when the invalid fmdev->resp_skb passes the check, a null pointer dereference error may occur at line 478, evt_hdr = (void *)skb->data; To address this issue, it is recommended to include the validity check of fmdev->resp_skb within the locked section of the function. This modification ensures that the value of fmdev->resp_skb does not change during the validation process, thereby maintaining its validity. This possible bug is found by an experimental static analysis tool developed by our team. This tool analyzes the locking APIs to extract function pairs that can be concurrently executed, and then analyzes the instructions in the paired functions to identify possible concurrency bugs including data races and atomicity violations.
CVSS metrics
3 scores · 3 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.22%
Chance of exploitation in the next 30 days
Percentile
12%
Versus all other CVEs
30-day change
0.00 pp
From 0.22% on 21-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu134 products
- linuxAll versions (No fix recorded) | < 5.4.0-211.231 | < 5.15.0-135.146 | < 6.8.0-58.60
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 5.4.0-1142.152 | < 5.15.0-1080.87 | < 6.8.0-1027.29
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ e8454ff7b9a4d56f02c095bff12d3c92ef4c7fa6, < d16109c9fdc1b8cea4fe63b42e06e926c3f68990 | ≥ e8454ff7b9a4d56f02c095bff12d3c92ef4c7fa6, < 3c818ad07e964bca3d27adac1e1f50e1e3c9180e | ≥ e8454ff7b9a4d56f02c095bff12d3c92ef4c7fa6, < d7408a052aa1b4f6fb6f1c7a8877b84017a07ac9 | ≥ e8454ff7b9a4d56f02c095bff12d3c92ef4c7fa6, < ed228b74d8a500380150965d5becabf9a1e33141 | ≥ e8454ff7b9a4d56f02c095bff12d3c92ef4c7fa6, < 372dc9509122e5d45d4c12978e31c3c7d00aaca4 | ≥ e8454ff7b9a4d56f02c095bff12d3c92ef4c7fa6, < 378ce4e08ca2b1ac7bbf1d57b68643ca4226c5f8 | ≥ e8454ff7b9a4d56f02c095bff12d3c92ef4c7fa6, < 2e63c908de357048180516b84740ed62dac0b269 | ≥ e8454ff7b9a4d56f02c095bff12d3c92ef4c7fa6, < 80a3b2ee01eecf22dfa06968b3cde92c691dea10 | ≥ e8454ff7b9a4d56f02c095bff12d3c92ef4c7fa6, < ca59f9956d4519ab18ab2270be47c6b8c6ced091 | 2.6.39
- linux_kernel≥ 2.6.39, < 4.19.325 | ≥ 4.20, < 5.4.287 | ≥ 5.5, < 5.10.231 | ≥ 5.11, < 5.15.174 | ≥ 5.16, < 6.1.120 | ≥ 6.2, < 6.6.64 | ≥ 6.7, < 6.11.11 | ≥ 6.12, < 6.12.2
Debian1 product
- linux< 6.1.123-1 | < 6.12.3-1
3 vendors · 137 products
