params: fix charp corruption on allocation failure
Key facts
- Attack vector
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- Privileges required
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- User interaction
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- Attack complexity
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- Impact type
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- Confidentiality · integrity · availability
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- Fix status
- Partial Red Hat: 7 without a fix
No CVSS vector from any source. Fix status from CNA and Red Hat.
Summary
In the Linux kernel, the following vulnerability has been resolved: params: fix charp corruption on allocation failure param_set_charp() stores charp parameters in allocated memory after slab is available, and releases the previous value when the parameter is updated. The previous value is released before the replacement allocation succeeds. If kmalloc_parameter() fails, the setter returns -ENOMEM with the parameter left as NULL. Failing zswap's compressor update before zswap is initialized can later trigger: BUG: kernel NULL pointer dereference, address: 0000000000000000 RIP: 0010:strcmp+0x10/0x30 Call Trace: zswap_setup+0x3b1/0x490 zswap_enabled_param_set+0x5b/0xa0 param_attr_store+0x93/0xe0 module_attr_store+0x1c/0x30 kernfs_fop_write_iter+0x116/0x1f0 Allocate and copy the replacement first, then replace the parameter value only after allocation succeeds.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 2.6.30 and later | 5.10.273, 5.15.224, 6.1.191, 6.6.160, 6.12.109, 6.18.50, 7.2.4, 7.3 | Patch available | CNA |
- Linux VendorLinux Affected 2.6.30 and later Fixed in 5.10.273, 5.15.224, 6.1.191, 6.6.160, 6.12.109, 6.18.50, 7.2.4, 7.3 Patch available CNA
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.10.273, 5.15.224, 6.1.191, 6.6.160, 6.12.109, 6.18.50, 7.2.4, 7.3
Vendor assessments
Red Hat
Red Hat rating: Low. 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 7 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 5 | Affected | No fix yet: Fix deferred |
Timeline
- 2026-10-02 Threatist record created from CVE-2026-89552
- 2026-10-03 Alias added: GHSA-gmqc-x8hx-2ggc
- 2026-10-19 Fix available: Linux/[email protected] · CNA
- 2026-10-21 Fix available: Linux/Linux@31b41ea8383d51992d6b0dfe3a99da1dec8ce1c1, Linux/[email protected] · CNA
- 2026-10-21 1 new reference · CNA
- 2026-10-30 Fix available: Linux/Linux@32c1f305cfad192cd98468140beedeffe4792f53, Linux/[email protected], Linux/[email protected] +3 · CNA
- 2026-10-30 3 new references · CNA
- 2026-11-07 Affected versions changed · Red Hat
References
Other 8
- https://git.kernel.org/stable/c/72835d539ed3eb4c4b85b85a3f3976c7bdc70b91
- https://git.kernel.org/stable/c/c7cc1edf3c0de948abcb3e4a44ee86a82403ce2f
- https://git.kernel.org/stable/c/32c1f305cfad192cd98468140beedeffe4792f53
- https://git.kernel.org/stable/c/31b41ea8383d51992d6b0dfe3a99da1dec8ce1c1
- https://git.kernel.org/stable/c/614f873268c5b172804c9af6639bd17b7e1e2359
- https://git.kernel.org/stable/c/704ecd010d4a9b33160e40b74eb402f6b86a18e0
- https://git.kernel.org/stable/c/0d8e2404925a0607ffec79a53170715a46936896
- https://git.kernel.org/stable/c/3dfaae04243cde460d82dfc2a7dd0bb6664d20ae
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Sources
- CVE-2026-89552 · CVE Program
- CVE-2026-89552 · NVD
- FIRST EPSS
- GHSA-gmqc-x8hx-2ggc · GitHub Advisory Database · CC BY 4.0
- CVE-2026-89552 · Red Hat security data · CC BY 4.0
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