params: fix charp corruption on allocation failure

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89552
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:38 UTC
Updated2026-09-11 20:19:38 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.001680000 probability, percentile 0.063580000 (date 2026-09-14)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected e180a6b7759a99a28cbcce3547c4c80822cb6c2a 614f873268c5b172804c9af6639bd17b7e1e2359 git Not specified
CNA Linux Linux affected e180a6b7759a99a28cbcce3547c4c80822cb6c2a 704ecd010d4a9b33160e40b74eb402f6b86a18e0 git Not specified
CNA Linux Linux affected e180a6b7759a99a28cbcce3547c4c80822cb6c2a 0d8e2404925a0607ffec79a53170715a46936896 git Not specified
CNA Linux Linux affected e180a6b7759a99a28cbcce3547c4c80822cb6c2a 3dfaae04243cde460d82dfc2a7dd0bb6664d20ae git Not specified
CNA Linux Linux affected 2.6.30 Not specified
CNA Linux Linux unaffected 2.6.30 semver Not specified
CNA Linux Linux unaffected 6.12.109 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/0d8e2404925a0607ffec79a53170715a46936896 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3dfaae04243cde460d82dfc2a7dd0bb6664d20ae 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/704ecd010d4a9b33160e40b74eb402f6b86a18e0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/614f873268c5b172804c9af6639bd17b7e1e2359 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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