VulnerabilityPublished 11 Sep 2026Updated 21 Oct 2026

CVE-2026-89552: Linux kernel · params: fix charp corruption on allocation failure

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in 704ecd010d4a9b33160e40b74eb402f6b86a18e0 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:07 UTC

Severity

Unrated

Rated by Threat Radar · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 704ecd010d4a9b33160e40b74eb402f6b86a18e0, 614f873268c5b172804c9af6639bd17b7e1e2359, 31b41ea8383d51992d6b0dfe3a99da1dec8ce1c1 +2

Exploitation evidence

Disclosed: evidence found.
CVE published 11 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ e180a6b7759a99a28cbcce3547c4c80822cb6c2a, < 704ecd010d4a9b33160e40b74eb402f6b86a18e0	Fixed in 704ecd010d4a9b33160e40b74eb402f6b86a18e0
LinuxLinux	Affected ≥ e180a6b7759a99a28cbcce3547c4c80822cb6c2a, < 614f873268c5b172804c9af6639bd17b7e1e2359	Fixed in 614f873268c5b172804c9af6639bd17b7e1e2359
LinuxLinux	Affected ≥ e180a6b7759a99a28cbcce3547c4c80822cb6c2a, < 31b41ea8383d51992d6b0dfe3a99da1dec8ce1c1	Fixed in 31b41ea8383d51992d6b0dfe3a99da1dec8ce1c1
LinuxLinux	Affected ≥ e180a6b7759a99a28cbcce3547c4c80822cb6c2a, < 3dfaae04243cde460d82dfc2a7dd0bb6664d20ae	Fixed in 3dfaae04243cde460d82dfc2a7dd0bb6664d20ae
LinuxLinux	Affected ≥ e180a6b7759a99a28cbcce3547c4c80822cb6c2a, < 0d8e2404925a0607ffec79a53170715a46936896	Fixed in 0d8e2404925a0607ffec79a53170715a46936896
LinuxLinux	Affected =2.6.30	Fixed in–

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.

References

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