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CVE-2024-26993fs: sysfs: Fix reference leak in sysfs_break_active_protection()

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.

Timeline

  1. ID reserved

    By Linux

  2. · 2 months later

    Published

  3. · 2 years later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2024-26993, by who scored it
Scored byCVSSScoreVector
NVDNVD · Modified3.1Medium5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS (exploitation in 30 days)
0.27% · top 81% of all CVEs (15 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.

Affected products

  • Linux · Linux

    • affected 2afc9166f79b8f6da5f347f48515215ceee4ae37 – < f28bba37fe244889b81bb5c508d3f6e5c6e342c5
    • affected 2afc9166f79b8f6da5f347f48515215ceee4ae37 – < 57baab0f376bec8f54b0fe6beb8f77a57c228063
    • affected 2afc9166f79b8f6da5f347f48515215ceee4ae37 – < 84bd4c2ae9c3d0a7d3a5c032ea7efff17af17e17
    • affected 2afc9166f79b8f6da5f347f48515215ceee4ae37 – < 43f00210cb257bcb0387e8caeb4b46375d67f30c
    • affected 2afc9166f79b8f6da5f347f48515215ceee4ae37 – < 5d43e072285e81b0b63cee7189b3357c7768a43b
    • affected 2afc9166f79b8f6da5f347f48515215ceee4ae37 – < ac107356aabc362aaeb77463e814fc067a5d3957
    • affected 2afc9166f79b8f6da5f347f48515215ceee4ae37 – < a4c99b57d43bab45225ba92d574a8683f9edc8e4
    • affected 2afc9166f79b8f6da5f347f48515215ceee4ae37 – < a90bca2228c0646fc29a72689d308e5fe03e6d78
    • affected e8a37b2fd5b5087bec6cbbf6946ee3caa712953b
    • affected a6abc93760dd07fcd29760b70e6e7520f22cb288
    • affected 461a6385e58e8247e6ba2005aa5d1b8d980ee4a2
    • affected 8a5e02a0f46ea33ed19e48e096a8e8d28e73d10a
    • affected c984f4d1d40a2f349503b3faf946502ccbf02f9f
    • affected 807d1d299a04e9ad9a9dac55419c1137a105254b
    • affected 3.16.62 – < 3.17
    • affected 3.18.121 – < 3.19
    • affected 4.4.154 – < 4.5
    • affected 4.9.125 – < 4.10
    • affected 4.14.68 – < 4.15
    • affected 4.18.6 – < 4.19

  • Linux · Linux

    • affected 4.19
    • unaffected < 4.19
    • unaffected 4.19.313 – ≤ 4.19.*
    • unaffected 5.4.275 – ≤ 5.4.*
    • unaffected 5.10.216 – ≤ 5.10.*
    • unaffected 5.15.157 – ≤ 5.15.*
    • unaffected 6.1.88 – ≤ 6.1.*
    • unaffected 6.6.29 – ≤ 6.6.*
    • unaffected 6.8.8 – ≤ 6.8.*
    • unaffected 6.9 – ≤ *

References

References15

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .