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CVE-2024-26993

fs: sysfs: Fix reference leak in sysfs_break_active_protection()

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 3.17, 3.19, 4.5, 4.10, 4.15, and 8 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: partial

Summary

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. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux Linux

    From 2afc9166f79b8f6da5f347f48515215ceee4ae37 · fixed in f28bba37fe244889b81bb5c508d3f6e5c6e342c5; From 2afc9166f79b8f6da5f347f48515215ceee4ae37 · fixed in 57baab0f376bec8f54b0fe6beb8f77a57c228063; From 2afc9166f79b8f6da5f347f48515215ceee4ae37 · fixed in 84bd4c2ae9c3d0a7d3a5c032ea7efff17af17e17; From 2afc9166f79b8f6da5f347f48515215ceee4ae37 · fixed in 43f00210cb257bcb0387e8caeb4b46375d67f30c; From 2afc9166f79b8f6da5f347f48515215ceee4ae37 · fixed in 5d43e072285e81b0b63cee7189b3357c7768a43b; From 2afc9166f79b8f6da5f347f48515215ceee4ae37 · fixed in ac107356aabc362aaeb77463e814fc067a5d3957; From 2afc9166f79b8f6da5f347f48515215ceee4ae37 · fixed in a4c99b57d43bab45225ba92d574a8683f9edc8e4; From 2afc9166f79b8f6da5f347f48515215ceee4ae37 · fixed in a90bca2228c0646fc29a72689d308e5fe03e6d78; From 3.16.62 · fixed in 3.17; From 3.18.121 · fixed in 3.19; From 4.4.154 · fixed in 4.5; From 4.9.125 · fixed in 4.10; From 4.14.68 · fixed in 4.15; From 4.18.6 · fixed in 4.19

  • Linux Linux

    4.19

  • KernelLinux

    From 4.19.0 · fixed in 4.19.313; From 4.20.0 · fixed in 5.4.275; From 5.5.0 · fixed in 5.10.216; From 5.11.0 · fixed in 5.15.157; From 5.16.0 · fixed in 6.1.88; From 6.2.0 · fixed in 6.6.29; From 6.7.0 · fixed in 6.8.8

References 8

git.kernel.org