CVE-2024-26993: fs: sysfs: Fix reference leak in sysfs_break_active_protection()
Vulnerability summary
CVE-2024-26993 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.27% chance of exploitation in the next 30 days, higher than 18.9% of scored vulnerabilities.
Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 45 · Related 28Timeline
- 01-05-2024PublishedVulnerability first disclosed.
- 15-10-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: fs: sysfs: Fix reference leak in sysfs_break_active_protection() The sysfs_break_active_protection() routine has an obvious reference leak in its error path. If the call to kernfs_find_and_get() fails then kn will be NULL, so the companion sysfs_unbreak_active_protection() routine won't get called (and would only cause an access violation by trying to dereference kn->parent if it was called). As a result, the reference to kobj acquired at the start of the function will never be released. Fix the leak by adding an explicit kobject_put() call when kn is NULL.
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
0.27%
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
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 causeNo weakness data has been published for this record.
Affected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu122 products
- linuxAll versions (No fix recorded) | < 5.4.0-189.209 | < 5.15.0-116.126 | < 6.8.0-38.38
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 5.4.0-1128.138 | < 5.15.0-1065.71 | < 6.8.0-1011.12
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ 2afc9166f79b8f6da5f347f48515215ceee4ae37, < f28bba37fe244889b81bb5c508d3f6e5c6e342c5 | ≥ 2afc9166f79b8f6da5f347f48515215ceee4ae37, < 57baab0f376bec8f54b0fe6beb8f77a57c228063 | ≥ 2afc9166f79b8f6da5f347f48515215ceee4ae37, < 84bd4c2ae9c3d0a7d3a5c032ea7efff17af17e17 | ≥ 2afc9166f79b8f6da5f347f48515215ceee4ae37, < 43f00210cb257bcb0387e8caeb4b46375d67f30c | ≥ 2afc9166f79b8f6da5f347f48515215ceee4ae37, < 5d43e072285e81b0b63cee7189b3357c7768a43b | ≥ 2afc9166f79b8f6da5f347f48515215ceee4ae37, < ac107356aabc362aaeb77463e814fc067a5d3957 | ≥ 2afc9166f79b8f6da5f347f48515215ceee4ae37, < a4c99b57d43bab45225ba92d574a8683f9edc8e4 | ≥ 2afc9166f79b8f6da5f347f48515215ceee4ae37, < a90bca2228c0646fc29a72689d308e5fe03e6d78 | e8a37b2fd5b5087bec6cbbf6946ee3caa712953b | a6abc93760dd07fcd29760b70e6e7520f22cb288 | 461a6385e58e8247e6ba2005aa5d1b8d980ee4a2 | 8a5e02a0f46ea33ed19e48e096a8e8d28e73d10a | c984f4d1d40a2f349503b3faf946502ccbf02f9f | 807d1d299a04e9ad9a9dac55419c1137a105254b | ≥ 3.16.62, < 3.17 | ≥ 3.18.121, < 3.19 | ≥ 4.4.154, < 4.5 | ≥ 4.9.125, < 4.10 | ≥ 4.14.68, < 4.15 | ≥ 4.18.6, < 4.19 | 4.19
- linux_kernel≥ 3.16.62, < 3.17 | ≥ 3.18.121, < 3.19 | ≥ 4.4.154, < 4.5 | ≥ 4.9.125, < 4.10 | ≥ 4.14.68, < 4.15 | ≥ 4.18.6, < 4.19 | ≥ 4.19, < 5.15.157 | ≥ 5.16, < 6.1.88 | ≥ 6.2, < 6.6.29 | ≥ 6.7, < 6.8.8 | 6.9:rc1 | 6.9:rc2 | 6.9:rc3 | 6.9:rc4
Debian1 product
- linux< 6.1.90-1 | < 6.8.9-1
3 vendors · 125 products
References
37 links
lists.debian.org/debian-lts-announce/2024/06/msg00017.htmlX TransferredMailing ListThird Party Advisory- lists.debian.org/debian-lts-announce/2024/06/msg00020.htmlX TransferredMailing ListThird Party Advisory
