Is there a public exploit for CVE-2026-99180?

No public exploit for CVE-2026-99180 was found in Exploit-DB, Metasploit, Nuclei templates or public proof-of-concept repositories. That is an absence of evidence rather than proof that none exists.

How severe is CVE-2026-99180?

CVE-2026-99180 scores CVSS 7.8 (v3.1), rated high. EPSS puts the chance of exploitation in the next 30 days at 0.17%.

7.8 High

In the Linux kernel, the following vulnerability has been resolved: unicode: free the map after a grace period genericcidhash() and…

CVE-2026-99180

In the Linux kernel, the following vulnerability has been resolved: unicode: free the map after a grace period genericcidhash() and genericcidcompare() read sb->sencoding and dereference the unicode map while a pathwalk in rcu mode holds nothing but rcureadlock(). The filesystems that use them, ext4, f2fs and tmpfs, drop the map with utf8unload() from ->putsuper(), which runs when the last reference to the mount goes away. A lookup that is still inside such a filesystem at that point reads a freed map. With a pathwalk held up in utf8casefoldhash() while the last reference to a casefolded tmpfs goes away: BUG: KASAN: slab-use-after-free in utf8nlookup+0x74c/0x950 Read of size 8 at addr ff110001030fe658 by task walker/98 Call Trace: utf8nlookup+0x74c/0x950 utf8byte+0x160/0x1560 utf8casefoldhash+0x167/0x230 genericcidhash+0xdd/0x1c0 linkpathwalk+0x11ad/0x1d30 pathlookupat+0x63/0xb00 filenamelookup+0x1f1/0x5b0 vfsstatx+0xd7/0x3b0 [...] Allocated by task 94: kmalloccachenoprof+0x249/0x560 utf8load+0x4e/0x570 shmemparseoptcasefold.isra.0+0x92/0x270 [...] Freed by task 97: kfree+0x1db/0x5b0 shmemputsuper+0x72/0x170 genericshutdownsuper+0x14c/0x530 killanonsuper+0x3a/0x60…

Assessment

CVSS: 7.8 (v3.1)
Severity: High
EPSS: 0.17% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 28 October 2026
Last updated: 31 October 2026
Affected: Linux
Assigner: Linux

CVSS vectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

At the source

EUVD (ENISA)

References

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