regulator: core: fix locking in regulator_resolve_supply() error path
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 3 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-667 and the CVSS impact.
Summary
In the Linux kernel, the following vulnerability has been resolved: regulator: core: fix locking in regulator_resolve_supply() error path If late enabling of a supply regulator fails in regulator_resolve_supply(), the code currently triggers a lockdep warning: WARNING: drivers/regulator/core.c:2649 at _regulator_put+0x80/0xa0, CPU#6: kworker/u32:4/596 ... Call trace: _regulator_put+0x80/0xa0 (P) regulator_resolve_supply+0x7cc/0xbe0 regulator_register_resolve_supply+0x28/0xb8 as the regulator_list_mutex must be held when calling _regulator_put(). To solve this, simply switch to using regulator_put(). While at it, we should also make sure that no concurrent access happens to our rdev while we clear out the supply pointer. Add appropriate locking to ensure that. While the code in question will be removed altogether in a follow-up commit, I believe it is still beneficial to have this corrected before removal for future reference.
Why it matters now
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 | 4.2 and later | 5.10.260, 5.15.211, 6.1.177, 6.6.144, 6.12.95, 6.18.37, 6.19.4, 7.0 | Patch available | CNA |
- Linux VendorLinux Affected 4.2 and later Fixed in 5.10.260, 5.15.211, 6.1.177, 6.6.144, 6.12.95, 6.18.37, 6.19.4, 7.0 Patch available CNA
CPE configurations NVD · 7
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 4.2.1 to before 6.19.4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.2:-:*:*:*:*:*:* | 4.2 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.2:rc4:*:*:*:*:*:* | 4.2 rc4 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.2:rc5:*:*:*:*:*:* | 4.2 rc5 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.2:rc6:*:*:*:*:*:* | 4.2 rc6 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.2:rc7:*:*:*:*:*:* | 4.2 rc7 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:4.2:rc8:*:*:*:*:*:* | 4.2 rc8 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 4.2.1 to before 6.19.4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.2:-:*:*:*:*:*:* Versions 4.2 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.2:rc4:*:*:*:*:*:* Versions 4.2 rc4 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.2:rc5:*:*:*:*:*:* Versions 4.2 rc5 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.2:rc6:*:*:*:*:*:* Versions 4.2 rc6 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.2:rc7:*:*:*:*:*:* Versions 4.2 rc7 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:4.2:rc8:*:*:*:*:*:* Versions 4.2 rc8 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.10.260, 5.15.211, 6.1.177, 6.6.144, 6.12.95, 6.18.37, 6.19.4, 7.0
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
Not affected: 2 products
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
Timeline
- 2026-10-02 Threatist record created from CVE-2026-46252
- 2026-10-03 Alias added: GHSA-w447-hxj8-xq6p
- 2026-11-06 CISA SSVC decision points changed
References
Patch 2
Other 6
- https://git.kernel.org/stable/c/e77357dc2293283fc08a485b1e2e571d91d02622
- https://git.kernel.org/stable/c/a8a2eab1166bc33ee38ca371cff425bdb5681e47
- https://git.kernel.org/stable/c/60747114fd2a38739130b715e7b2d40ce848f0be
- https://git.kernel.org/stable/c/c84860dac7af7dc3c3e3c9ae86d65e222c2f3b0c
- https://git.kernel.org/stable/c/3b7fffd7a8984a1c009f668765ee7631fd6b87c8
- https://git.kernel.org/stable/c/bde74af8d4466213007bdd42cc85fa72c861dea7
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Sources
- CVE-2026-46252 · CVE Program
- CVE-2026-46252 · NVD
- FIRST EPSS
- GHSA-w447-hxj8-xq6p · GitHub Advisory Database · CC BY 4.0
- CVE-2026-46252 · Red Hat security data · CC BY 4.0
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