CVE-2024-26828: cifs: fix underflow in parse_server_interfaces()
Vulnerability summary
CVE-2024-26828 is a critical (CVSS 9.4) Integer Underflow (Wrap or Wraparound) vulnerability in linux. EPSS estimates a 0.75% chance of exploitation in the next 30 days, higher than 55.1% of scored vulnerabilities.
Severe, CVSS 9.4 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 196 · Related 192Showing 100 of 196.
Timeline
- 17-04-2024PublishedVulnerability first disclosed.
- 30-10-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: cifs: fix underflow in parse_server_interfaces() In this loop, we step through the buffer and after each item we check if the size_left is greater than the minimum size we need. However, the problem is that "bytes_left" is type ssize_t while sizeof() is type size_t. That means that because of type promotion, the comparison is done as an unsigned and if we have negative bytes left the loop continues instead of ending.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated9.4CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H
- OSV · DebianEcosystem advisory · calculated9.4CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H
- NVDNIST9.4CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:H
EPSS trend
Probability
0.75%
Chance of exploitation in the next 30 days
Percentile
55%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.75% 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, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu112 products
- linux< 5.4.0-189.209 | < 5.15.0-116.126
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 5.4.0-1128.138 | < 5.15.0-1065.71
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ fe856be475f7cf5ffcde57341d175ce9fd09434b, < 3babdcb5f1809a9a41e31547a063dedf6bb44cca | ≥ fe856be475f7cf5ffcde57341d175ce9fd09434b, < 7190353835b4a219abb70f90b06cdcae97f11512 | ≥ fe856be475f7cf5ffcde57341d175ce9fd09434b, < f7ff1c89fb6e9610d2b01c1821727729e6609308 | ≥ fe856be475f7cf5ffcde57341d175ce9fd09434b, < df2af9fdbc4ddde18a3371c4ca1a86596e8be301 | ≥ fe856be475f7cf5ffcde57341d175ce9fd09434b, < cffe487026be13eaf37ea28b783d9638ab147204 | 4.18
- linux_kernel≥ 4.18, < 6.1.79 | ≥ 6.2, < 6.6.18 | ≥ 6.7, < 6.7.6 | 6.8:rc1 | 6.8:rc2 | 6.8:rc3 | 6.8:rc4
Debian1 product
- linux< 6.1.82-1 | < 6.7.7-1
3 vendors · 115 products
