fs: sysfs: Fix reference leak in sysfs_break_active_protection()
Priority LOW 24Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 28 fixed, 3 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00267 18th percentileScored 2026-11-07
Fix Partial Linux (Linux): 3.17, 3.19, 4.5 +11Red Hat: 11 advisoriesRed Hat: 28 fixed, 3 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 3.16.62 to before 3.17; 3.18.121 to before 3.19; 4.4.154 to before 4.5; 4.9.125 to before 4.10; 4.14.68 to before 4.15; 4.18.6 to before 4.19 | 3.17, 3.19, 4.5, 4.10, 4.15, 4.19 | Patch available | CNA |
| Linux | Linux | 4.19 and later | 4.19.313, 5.4.275, 5.10.216, 5.15.157, 6.1.88, 6.6.29, 6.8.8, 6.9 | Patch available | CNA |
- Linux VendorLinux Affected 3.16.62 to before 3.17; 3.18.121 to before 3.19; 4.4.154 to before 4.5; 4.9.125 to before 4.10; 4.14.68 to before 4.15; 4.18.6 to before 4.19 Fixed in 3.17, 3.19, 4.5, 4.10, 4.15, 4.19 Patch available CNA
- Linux VendorLinux Affected 4.19 and later Fixed in 4.19.313, 5.4.275, 5.10.216, 5.15.157, 6.1.88, 6.6.29, 6.8.8, 6.9 Patch available CNA
CPE configurations NVD · 5
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 3.16.62 to before 3.17; 3.18.121 to before 3.19; 4.4.154 to before 4.5; 4.9.125 to before 4.10; 4.14.68 to before 4.15; 4.18.6 to before 4.19; 4.19 to before 5.15.157; 5.16 to before 6.1.88; 6.2 to before 6.6.29; 6.7 to before 6.8.8 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.9:rc1:*:*:*:*:*:* | 6.9 rc1 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.9:rc2:*:*:*:*:*:* | 6.9 rc2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.9:rc3:*:*:*:*:*:* | 6.9 rc3 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:6.9:rc4:*:*:*:*:*:* | 6.9 rc4 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 3.16.62 to before 3.17; 3.18.121 to before 3.19; 4.4.154 to before 4.5; 4.9.125 to before 4.10; 4.14.68 to before 4.15; 4.18.6 to before 4.19; 4.19 to before 5.15.157; 5.16 to before 6.1.88; 6.2 to before 6.6.29; 6.7 to before 6.8.8 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.9:rc1:*:*:*:*:*:* Versions 6.9 rc1 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.9:rc2:*:*:*:*:*:* Versions 6.9 rc2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.9:rc3:*:*:*:*:*:* Versions 6.9 rc3 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:6.9:rc4:*:*:*:*:*:* Versions 6.9 rc4 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 3.17, 3.19, 4.5, 4.10, 4.15, 4.19
- Fix · CNA Linux (Linux) Fixed in 4.19.313, 5.4.275, 5.10.216, 5.15.157, 6.1.88, 6.6.29, 6.8.8, 6.9
Red Hat 11 advisories
- RHSA-2024:7002 Released 2024-09-24 · Red Hat rating Importantkernel security update
- Red Hat Enterprise Linux BaseOS AUS (v.8.4) bpftool-4.18.0-305.141.1.el8_4, kernel-4.18.0-305.141.1.el8_4, kernel-abi-stablelists-4.18.0-305.141.1.el8_4 +14
- Red Hat Enterprise Linux BaseOS E4S (v.8.4) bpftool-4.18.0-305.141.1.el8_4, kernel-4.18.0-305.141.1.el8_4, kernel-abi-stablelists-4.18.0-305.141.1.el8_4 +14
- Red Hat Enterprise Linux BaseOS TUS (v.8.4) bpftool-4.18.0-305.141.1.el8_4, kernel-4.18.0-305.141.1.el8_4, kernel-abi-stablelists-4.18.0-305.141.1.el8_4 +14
- RHSA-2024:7003 Released 2024-09-24 · Red Hat rating Importantkernel-rt security update
- Red Hat Enterprise Linux NFV TUS (v.8.4) kernel-rt-4.18.0-305.141.1.rt7.217.el8_4, kernel-rt-core-4.18.0-305.141.1.rt7.217.el8_4, kernel-rt-debug-4.18.0-305.141.1.rt7.217.el8_4 +9
- Red Hat Enterprise Linux RT TUS (v.8.4) kernel-rt-4.18.0-305.141.1.rt7.217.el8_4, kernel-rt-core-4.18.0-305.141.1.rt7.217.el8_4, kernel-rt-debug-4.18.0-305.141.1.rt7.217.el8_4 +7
- RHSA-2024:6206 Released 2024-09-03 · Red Hat rating Importantkernel security update
- Red Hat CodeReady Linux Builder EUS (v.8.8) kernel-tools-libs-devel-4.18.0-477.70.1.el8_8
- Red Hat Enterprise Linux BaseOS EUS (v.8.8) bpftool-4.18.0-477.70.1.el8_8, kernel-4.18.0-477.70.1.el8_8, kernel-abi-stablelists-4.18.0-477.70.1.el8_8 +19
Show 8 more Red Hat advisories
- RHSA-2024:5257 Released 2024-08-13 · Red Hat rating Importantkernel security update
- Red Hat Enterprise Linux AppStream E4S (v.9.0) kernel-debug-devel-5.14.0-70.112.1.el9_0, kernel-debug-devel-matched-5.14.0-70.112.1.el9_0, kernel-devel-5.14.0-70.112.1.el9_0 +5
- Red Hat Enterprise Linux BaseOS E4S (v.9.0) bpftool-5.14.0-70.112.1.el9_0, kernel-5.14.0-70.112.1.el9_0, kernel-abi-stablelists-5.14.0-70.112.1.el9_0 +14
- RHSA-2024:5256 Released 2024-08-13 · Red Hat rating Importantkernel-rt security update
- Red Hat Enterprise Linux NFV E4S (v.9.0) kernel-rt-5.14.0-70.112.1.rt21.184.el9_0, kernel-rt-core-5.14.0-70.112.1.rt21.184.el9_0, kernel-rt-debug-5.14.0-70.112.1.rt21.184.el9_0 +9
- Red Hat Enterprise Linux Real Time E4S (v.9.0) kernel-rt-5.14.0-70.112.1.rt21.184.el9_0, kernel-rt-core-5.14.0-70.112.1.rt21.184.el9_0, kernel-rt-debug-5.14.0-70.112.1.rt21.184.el9_0 +7
- RHSA-2024:4107 Released 2024-06-26 · Red Hat rating Moderatekernel security and bug fix update
- Red Hat Enterprise Linux BaseOS AUS (v.8.6) bpftool-4.18.0-372.109.1.el8_6, kernel-4.18.0-372.109.1.el8_6, kernel-abi-stablelists-4.18.0-372.109.1.el8_6 +14
- Red Hat Enterprise Linux BaseOS E4S (v.8.6) bpftool-4.18.0-372.109.1.el8_6, kernel-4.18.0-372.109.1.el8_6, kernel-abi-stablelists-4.18.0-372.109.1.el8_6 +19
- Red Hat Enterprise Linux BaseOS TUS (v.8.6) bpftool-4.18.0-372.109.1.el8_6, kernel-4.18.0-372.109.1.el8_6, kernel-abi-stablelists-4.18.0-372.109.1.el8_6 +14
- RHSA-2024:3627 Released 2024-06-05 · Red Hat rating Moderatekernel-rt security and bug fix update
- Red Hat Enterprise Linux NFV (v. 8) kernel-rt-4.18.0-553.5.1.rt7.346.el8_10, kernel-rt-core-4.18.0-553.5.1.rt7.346.el8_10, kernel-rt-debug-4.18.0-553.5.1.rt7.346.el8_10 +9
- Red Hat Enterprise Linux RT (v. 8) kernel-rt-4.18.0-553.5.1.rt7.346.el8_10, kernel-rt-core-4.18.0-553.5.1.rt7.346.el8_10, kernel-rt-debug-4.18.0-553.5.1.rt7.346.el8_10 +7
- RHSA-2024:3619 Released 2024-06-05 · Red Hat rating Moderatekernel security and bug fix update
- Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-427.20.1.el9_4, kernel-64k-debug-devel-matched-5.14.0-427.20.1.el9_4, kernel-64k-devel-5.14.0-427.20.1.el9_4 +11
- Red Hat Enterprise Linux BaseOS (v. 9) bpftool-7.3.0-427.20.1.el9_4, kernel-5.14.0-427.20.1.el9_4, kernel-64k-5.14.0-427.20.1.el9_4 +29
- Red Hat Enterprise Linux CRB (v. 9) kernel-tools-libs-devel-5.14.0-427.20.1.el9_4, libperf-5.14.0-427.20.1.el9_4
- Red Hat Enterprise Linux NFV (v. 9) kernel-rt-5.14.0-427.20.1.el9_4, kernel-rt-core-5.14.0-427.20.1.el9_4, kernel-rt-debug-5.14.0-427.20.1.el9_4 +11
- Red Hat Enterprise Linux RT (v. 9) kernel-rt-5.14.0-427.20.1.el9_4, kernel-rt-core-5.14.0-427.20.1.el9_4, kernel-rt-debug-5.14.0-427.20.1.el9_4 +9
- RHSA-2024:3618 Released 2024-06-05 · Red Hat rating Moderatekernel update
- Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-553.5.1.el8_10, kernel-4.18.0-553.5.1.el8_10, kernel-abi-stablelists-4.18.0-553.5.1.el8_10 +19
- Red Hat Enterprise Linux CRB (v. 8) kernel-tools-libs-devel-4.18.0-553.5.1.el8_10
- RHSA-2024:3461 Released 2024-05-29 · Red Hat rating Moderatekernel security and bug fix update
- Red Hat CodeReady Linux Builder EUS (v.9.2) kernel-tools-libs-devel-5.14.0-284.67.1.el9_2
- Red Hat Enterprise Linux AppStream EUS (v.9.2) kernel-64k-debug-devel-5.14.0-284.67.1.el9_2, kernel-64k-debug-devel-matched-5.14.0-284.67.1.el9_2, kernel-64k-devel-5.14.0-284.67.1.el9_2 +9
- Red Hat Enterprise Linux BaseOS EUS (v.9.2) bpftool-7.0.0-284.67.1.el9_2, kernel-5.14.0-284.67.1.el9_2, kernel-64k-5.14.0-284.67.1.el9_2 +29
- RHSA-2024:3460 Released 2024-05-29 · Red Hat rating Moderatekernel-rt security and bug fix update
- Red Hat Enterprise Linux Real Time EUS (v.9.2) kernel-rt-5.14.0-284.67.1.rt14.352.el9_2, kernel-rt-core-5.14.0-284.67.1.rt14.352.el9_2, kernel-rt-debug-5.14.0-284.67.1.rt14.352.el9_2 +9
- Red Hat Enterprise Linux Real Time for NFV EUS (v.9.2) kernel-rt-5.14.0-284.67.1.rt14.352.el9_2, kernel-rt-core-5.14.0-284.67.1.rt14.352.el9_2, kernel-rt-debug-5.14.0-284.67.1.rt14.352.el9_2 +11
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 9 | Affected | No fix yet |
| Red Hat CodeReady Linux Builder EUS (v.8.8) | Fixed | RHSA-2024:6206 |
| Red Hat CodeReady Linux Builder EUS (v.9.2) | Fixed | RHSA-2024:3461 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2024:3619 |
| Red Hat Enterprise Linux AppStream E4S (v.9.0) | Fixed | RHSA-2024:5257 |
| Red Hat Enterprise Linux AppStream EUS (v.9.2) | Fixed | RHSA-2024:3461 |
| Red Hat Enterprise Linux BaseOS (v. 8) | Fixed | RHSA-2024:3618 |
| Red Hat Enterprise Linux BaseOS (v. 9) | Fixed | RHSA-2024:3619 |
| Red Hat Enterprise Linux BaseOS AUS (v.8.4) | Fixed | RHSA-2024:7002 |
| Red Hat Enterprise Linux BaseOS AUS (v.8.6) | Fixed | RHSA-2024:4107 |
| Red Hat Enterprise Linux BaseOS E4S (v.8.4) | Fixed | RHSA-2024:7002 |
| Red Hat Enterprise Linux BaseOS E4S (v.8.6) | Fixed | RHSA-2024:4107 |
| Red Hat Enterprise Linux BaseOS E4S (v.9.0) | Fixed | RHSA-2024:5257 |
| Red Hat Enterprise Linux BaseOS EUS (v.8.8) | Fixed | RHSA-2024:6206 |
| Red Hat Enterprise Linux BaseOS EUS (v.9.2) | Fixed | RHSA-2024:3461 |
| Red Hat Enterprise Linux BaseOS TUS (v.8.4) | Fixed | RHSA-2024:7002 |
| Red Hat Enterprise Linux BaseOS TUS (v.8.6) | Fixed | RHSA-2024:4107 |
| Red Hat Enterprise Linux CRB (v. 8) | Fixed | RHSA-2024:3618 |
| Red Hat Enterprise Linux CRB (v. 9) | Fixed | RHSA-2024:3619 |
| Red Hat Enterprise Linux NFV (v. 8) | Fixed | RHSA-2024:3627 |
| Red Hat Enterprise Linux NFV (v. 9) | Fixed | RHSA-2024:3619 |
| Red Hat Enterprise Linux NFV E4S (v.9.0) | Fixed | RHSA-2024:5256 |
| Red Hat Enterprise Linux NFV TUS (v.8.4) | Fixed | RHSA-2024:7003 |
| Red Hat Enterprise Linux RT (v. 8) | Fixed | RHSA-2024:3627 |
| Red Hat Enterprise Linux RT (v. 9) | Fixed | RHSA-2024:3619 |
| Red Hat Enterprise Linux RT TUS (v.8.4) | Fixed | RHSA-2024:7003 |
| Red Hat Enterprise Linux Real Time E4S (v.9.0) | Fixed | RHSA-2024:5256 |
| Red Hat Enterprise Linux Real Time EUS (v.9.2) | Fixed | RHSA-2024:3460 |
| Red Hat Enterprise Linux Real Time for NFV EUS (v.9.2) | Fixed | RHSA-2024:3460 |
Not affected: 4 products
- Red Hat Enterprise Linux AppStream EUS (v.9.2)
- Red Hat Enterprise Linux BaseOS AUS (v.8.6)
- Red Hat Enterprise Linux BaseOS E4S (v.8.6)
- Red Hat Enterprise Linux BaseOS TUS (v.8.6)
Timeline
- 2026-10-02 Threatist record created from CVE-2024-26993
- 2026-10-03 Alias added: GHSA-x5rp-2v68-jcgf
References
Patch 8
- https://git.kernel.org/stable/c/f28bba37fe244889b81bb5c508d3f6e5c6e342c5
- https://git.kernel.org/stable/c/57baab0f376bec8f54b0fe6beb8f77a57c228063
- https://git.kernel.org/stable/c/84bd4c2ae9c3d0a7d3a5c032ea7efff17af17e17
- https://git.kernel.org/stable/c/43f00210cb257bcb0387e8caeb4b46375d67f30c
- https://git.kernel.org/stable/c/5d43e072285e81b0b63cee7189b3357c7768a43b
- https://git.kernel.org/stable/c/ac107356aabc362aaeb77463e814fc067a5d3957
- https://git.kernel.org/stable/c/a4c99b57d43bab45225ba92d574a8683f9edc8e4
- https://git.kernel.org/stable/c/a90bca2228c0646fc29a72689d308e5fe03e6d78
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Sources
- CVE-2024-26993 · CVE Program
- CVE-2024-26993 · NVD
- FIRST EPSS
- GHSA-x5rp-2v68-jcgf · GitHub Advisory Database · CC BY 4.0
- CVE-2024-26993 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences