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CVE-2026-89552

params: fix charp corruption on allocation failure

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.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
HerstellerLinux
≫
Produkt Linux
Default Statusunaffected
Version e180a6b7759a99a28cbcce3547c4c80822cb6c2a
Version < 614f873268c5b172804c9af6639bd17b7e1e2359
Status affected
Version e180a6b7759a99a28cbcce3547c4c80822cb6c2a
Version < 704ecd010d4a9b33160e40b74eb402f6b86a18e0
Status affected
Version e180a6b7759a99a28cbcce3547c4c80822cb6c2a
Version < 0d8e2404925a0607ffec79a53170715a46936896
Status affected
Version e180a6b7759a99a28cbcce3547c4c80822cb6c2a
Version < 3dfaae04243cde460d82dfc2a7dd0bb6664d20ae
Status affected
HerstellerLinux
≫
Produkt Linux
Default Statusaffected
Version 2.6.30
Status affected
Version 0
Version < 2.6.30
Status unaffected
Version <= 6.12.*
Version 6.12.109
Status unaffected
Version <= 6.18.*
Version 6.18.50
Status unaffected
Version <= 7.2.*
Version 7.2.4
Status unaffected
Version <= *
Version 7.3-rc1
Status unaffected
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.17% 0.063
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
Es wurden noch keine Informationen zu CWE veröffentlicht.
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