CVE-2026-89552

params: fix charp corruption on allocation failure

State: Published
Severity: Not scored
Published: Sep 11, 2026
Updated: Oct 30, 2026
Reserved: Sep 11, 2026

Description

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	e180a6b7759a99a28cbcce3547c4c80822cb6c2a to before 72835d539ed3eb4c4b85b85a3f3976c7bdc70b91Affected e180a6b7759a99a28cbcce3547c4c80822cb6c2a to before c7cc1edf3c0de948abcb3e4a44ee86a82403ce2fAffected e180a6b7759a99a28cbcce3547c4c80822cb6c2a to before 32c1f305cfad192cd98468140beedeffe4792f53Affected e180a6b7759a99a28cbcce3547c4c80822cb6c2a to before 31b41ea8383d51992d6b0dfe3a99da1dec8ce1c1Affected e180a6b7759a99a28cbcce3547c4c80822cb6c2a to before 614f873268c5b172804c9af6639bd17b7e1e2359Affected e180a6b7759a99a28cbcce3547c4c80822cb6c2a to before 704ecd010d4a9b33160e40b74eb402f6b86a18e0Affected e180a6b7759a99a28cbcce3547c4c80822cb6c2a to before 0d8e2404925a0607ffec79a53170715a46936896Affected e180a6b7759a99a28cbcce3547c4c80822cb6c2a to before 3dfaae04243cde460d82dfc2a7dd0bb6664d20aeAffected
LinuxLinux	2.6.30Affected before 2.6.30Not affected 5.10.273 through 5.10.Not affected 5.15.224 through 5.15.Not affected 6.1.191 through 6.1.Not affected 6.6.160 through 6.6.Not affected 6.12.109 through 6.12.Not affected 6.18.50 through 6.18.Not affected 7.2.4 through 7.2.*Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

e180a6b7759a99a28cbcce3547c4c80822cb6c2a to before 72835d539ed3eb4c4b85b85a3f3976c7bdc70b91Affected
e180a6b7759a99a28cbcce3547c4c80822cb6c2a to before c7cc1edf3c0de948abcb3e4a44ee86a82403ce2fAffected
e180a6b7759a99a28cbcce3547c4c80822cb6c2a to before 32c1f305cfad192cd98468140beedeffe4792f53Affected
e180a6b7759a99a28cbcce3547c4c80822cb6c2a to before 31b41ea8383d51992d6b0dfe3a99da1dec8ce1c1Affected
e180a6b7759a99a28cbcce3547c4c80822cb6c2a to before 614f873268c5b172804c9af6639bd17b7e1e2359Affected
e180a6b7759a99a28cbcce3547c4c80822cb6c2a to before 704ecd010d4a9b33160e40b74eb402f6b86a18e0Affected
e180a6b7759a99a28cbcce3547c4c80822cb6c2a to before 0d8e2404925a0607ffec79a53170715a46936896Affected
e180a6b7759a99a28cbcce3547c4c80822cb6c2a to before 3dfaae04243cde460d82dfc2a7dd0bb6664d20aeAffected

LinuxLinux

2.6.30Affected
before 2.6.30Not affected
5.10.273 through 5.10.*Not affected
5.15.224 through 5.15.*Not affected
6.1.191 through 6.1.*Not affected
6.6.160 through 6.6.*Not affected
6.12.109 through 6.12.*Not affected
6.18.50 through 6.18.*Not affected
7.2.4 through 7.2.*Not affected
7.3 and laterNot affected

References

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