4.4

CVE-2023-52492: dmaengine: fix NULL pointer in channel unregistration function

Analyzed
AliasesUBUNTU-CVE-2023-52492DEBIAN-CVE-2023-52492
Published 29-02-2024Last modified 11-05-2026

Vulnerability summary

CVE-2023-52492 is a medium (CVSS 4.4) NULL Pointer Dereference vulnerability in debian debian_linux. EPSS estimates a 0.27% chance of exploitation in the next 30 days, higher than 19.4% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 4.4, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
4.4/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.27%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 25 · Related 22
DLA-3842-1DSA-5681-1RHSA-2024:8856RHSA-2024:8870RHSA-2024:9315RHSA-2025:7526

Timeline

  1. 29-02-2024
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: dmaengine: fix NULL pointer in channel unregistration function __dma_async_device_channel_register() can fail. In case of failure, chan->local is freed (with free_percpu()), and chan->local is nullified. When dma_async_device_unregister() is called (because of managed API or intentionally by DMA controller driver), channels are unconditionally unregistered, leading to this NULL pointer: [ 1.318693] Unable to handle kernel NULL pointer dereference at virtual address 00000000000000d0 [...] [ 1.484499] Call trace: [ 1.486930] device_del+0x40/0x394 [ 1.490314] device_unregister+0x20/0x7c [ 1.494220] __dma_async_device_channel_unregister+0x68/0xc0 Look at dma_async_device_register() function error path, channel device unregistration is done only if chan->local is not NULL. Then add the same condition at the beginning of __dma_async_device_channel_unregister() function, to avoid NULL pointer issue whatever the API used to reach this function.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.27%

Chance of exploitation in the next 30 days

Percentile

19%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.27% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, administrative account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu104 products
  • linux< 5.15.0-106.116
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.15.0-1061.67
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
Linux2 products
  • linux≥ d2fb0a0438384fee08a418025f743913020033ce, < 9de69732dde4e443c1c7f89acbbed2c45a6a8e17 | ≥ d2fb0a0438384fee08a418025f743913020033ce, < 047fce470412ab64cb7345f9ff5d06919078ad79 | ≥ d2fb0a0438384fee08a418025f743913020033ce, < 2ab32986a0b9e329eb7f8f04dd57cc127f797c08 | ≥ d2fb0a0438384fee08a418025f743913020033ce, < 7f0ccfad2031eddcc510caf4e57f2d4aa2d8a50b | ≥ d2fb0a0438384fee08a418025f743913020033ce, < 9263fd2a63487c6d04cbb7b74a48fb12e1e352d0 | ≥ d2fb0a0438384fee08a418025f743913020033ce, < f5c24d94512f1b288262beda4d3dcb9629222fc7 | 5.6
  • linux_kernel≥ 5.6, < 5.10.210 | ≥ 5.11, < 5.15.149 | ≥ 5.16, < 6.1.76 | ≥ 6.2, < 6.6.15 | ≥ 6.7, < 6.7.3

3 vendors · 108 products

References

24 links
Show all 24 references