CVE-2024-56626: ksmbd: fix Out-of-Bounds Write in ksmbd_vfs_stream_write
Vulnerability summary
CVE-2024-56626 is a high (CVSS 8.8) Out-of-bounds Write vulnerability in linux. EPSS estimates a 0.70% chance of exploitation in the next 30 days, higher than 53.2% of scored vulnerabilities.
Not severe (CVSS 8.8, network access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 26 · Related 25Timeline
- 27-12-2024PublishedVulnerability first disclosed.
- 05-08-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix Out-of-Bounds Write in ksmbd_vfs_stream_write An offset from client could be a negative value, It could allows to write data outside the bounds of the allocated buffer. Note that this issue is coming when setting 'vfs objects = streams_xattr parameter' in ksmbd.conf.
CVSS metrics
5 scores · 4 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated8.8HighCVSS:3.1/AV:N/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:HDiffers
- NVDNIST7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HDiffers
EPSS trend
Probability
0.70%
Chance of exploitation in the next 30 days
Percentile
53%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.70% 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: network-reachable, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu123 products
- linux< 5.15.0-135.146 | < 6.8.0-58.60
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 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≥ 0626e6641f6b467447c81dd7678a69c66f7746cf, < 1aea5c9470be2c7129704fb1b9562b1e3e0576f8 | ≥ 0626e6641f6b467447c81dd7678a69c66f7746cf, < 8cd7490fc0f268883e86e840cda5311257af69ca | ≥ 0626e6641f6b467447c81dd7678a69c66f7746cf, < 164d3597d26d9acff5d5b8bc3208bdcca942dd6a | ≥ 0626e6641f6b467447c81dd7678a69c66f7746cf, < c5797f195c67132d061d29c57a7c6d30530686f0 | ≥ 0626e6641f6b467447c81dd7678a69c66f7746cf, < 313dab082289e460391c82d855430ec8a28ddf81 | 5.15
- linux_kernel≥ 5.15, < 5.15.176 | ≥ 5.16, < 6.1.120 | ≥ 6.2, < 6.6.66 | ≥ 6.7, < 6.12.5 | 6.13:rc1
Debian1 product
- linux< 6.1.123-1 | < 6.12.5-1
3 vendors · 126 products
