CVE-2024-56756: linux
Vulnerability summary
CVE-2024-56756 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.22% chance of exploitation in the next 30 days, higher than 11.5% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 51 · Related 51Timeline
- 29-12-2024PublishedVulnerability first disclosed.
- 11-05-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: nvme-pci: fix freeing of the HMB descriptor table The HMB descriptor table is sized to the maximum number of descriptors that could be used for a given device, but __nvme_alloc_host_mem could break out of the loop earlier on memory allocation failure and end up using less descriptors than planned for, which leads to an incorrect size passed to dma_free_coherent. In practice this was not showing up because the number of descriptors tends to be low and the dma coherent allocator always allocates and frees at least a page.
CVSS metrics
4 scores · 4 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
- NVDNIST5.5MediumCVSS: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 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Ubuntu133 products
- linux< 4.15.0-246.258 | < 5.4.0-211.231 | < 5.15.0-135.146 | < 6.8.0-58.60
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 4.15.0-1188.201 | < 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≥ 87ad72a59a38d1df217cfd95bc222a2edfe5d399, < ac22240540e0c5230d8c4138e3778420b712716a | ≥ 87ad72a59a38d1df217cfd95bc222a2edfe5d399, < 452f9ddd12bebc04cef741e8ba3806bf0e1fd015 | ≥ 87ad72a59a38d1df217cfd95bc222a2edfe5d399, < 869cf50b9c9d1059f5223f79ef68fc0bc6210095 | ≥ 87ad72a59a38d1df217cfd95bc222a2edfe5d399, < fb96d5cfa97a7363245b3dd523f475b04296d87b | ≥ 87ad72a59a38d1df217cfd95bc222a2edfe5d399, < cee3bff51a35cab1c5d842d409a7b11caefe2386 | ≥ 87ad72a59a38d1df217cfd95bc222a2edfe5d399, < 6d0f599db73b099aa724a12736369c4d4d92849d | ≥ 87ad72a59a38d1df217cfd95bc222a2edfe5d399, < 582d9ed999b004fb1d415ecbfa86d4d8df455269 | ≥ 87ad72a59a38d1df217cfd95bc222a2edfe5d399, < 3c2fb1ca8086eb139b2a551358137525ae8e0d7a | 4.13
- linux_kernel≥ 4.13, < 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 · 136 products
