VulnerabilityPublished 25 Sep 2026Updated 30 Oct 2026

CVE-2026-97605: Linux kernel · erofs: preserve LZMA decoders on resize failure

Source GCVE Database

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Authoritative record:CVE-2026-97605· Medium

Not known to be exploited · fixed in db0c3465b54a16debc089b2b3bda251d26c953d0 : update Linux kernel when convenient.

Data as of 30 Oct 2026, 17:33 UTC

Severity

Medium

Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none

Patch: Available – fixed in db0c3465b54a16debc089b2b3bda251d26c953d0, 617d0d8d199ba1790c94310fd75a22d01c97a8d6, 604ce546e1b9f35b1f45588004f53fac6b2869c1 +3

Exploitation evidence

Disclosed: evidence found.
CVE published 25 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 30 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.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), 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.

ghsa-8cg5-7hqp-6rcp

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 622ceaddb7649ca328832f50ba1400af778d75fa, < db0c3465b54a16debc089b2b3bda251d26c953d0	Fixed in db0c3465b54a16debc089b2b3bda251d26c953d0
LinuxLinux	Affected ≥ 622ceaddb7649ca328832f50ba1400af778d75fa, < 617d0d8d199ba1790c94310fd75a22d01c97a8d6	Fixed in 617d0d8d199ba1790c94310fd75a22d01c97a8d6
LinuxLinux	Affected ≥ 622ceaddb7649ca328832f50ba1400af778d75fa, < 604ce546e1b9f35b1f45588004f53fac6b2869c1	Fixed in 604ce546e1b9f35b1f45588004f53fac6b2869c1
LinuxLinux	Affected ≥ 622ceaddb7649ca328832f50ba1400af778d75fa, < 164cdbd7ac748c4df1a0c9b435286835668c1f33	Fixed in 164cdbd7ac748c4df1a0c9b435286835668c1f33
LinuxLinux	Affected ≥ 622ceaddb7649ca328832f50ba1400af778d75fa, < 38e9e07ac02a9453a117410776f1502a9980997e	Fixed in 38e9e07ac02a9453a117410776f1502a9980997e
LinuxLinux	Affected ≥ 622ceaddb7649ca328832f50ba1400af778d75fa, < 0b3c8c39e50249470f00a5f73c288b95a55ab576	Fixed in 0b3c8c39e50249470f00a5f73c288b95a55ab576

AI-suggested

Until a fix is confirmed, monitoring for updates from the Linux kernel maintainers is recommended.

Description

CVE-2026-97605 is a vulnerability in the Linux kernel's erofs filesystem related to LZMA decoder handling during pool resize operations. The flaw involves improper management of decoder streams when allocation fails, potentially leaving invalid decoder states unrepaired. The issue is addressed by changing the allocation and freeing sequence to ensure all replacements succeed before advancing the global maximum dictionary size and by recording each stream's dictionary capacity to handle retries correctly.

Impact

The vulnerability can cause the erofs filesystem's LZMA decoder streams to enter an invalid state during resize operations, potentially leading to malfunction or instability in handling compressed data. However, no public exploit or in-the-wild exploitation is known. The impact is limited to the integrity and reliability of LZMA decompression within the erofs filesystem under specific resize failure conditions.

Summary

This vulnerability in the Linux kernel's erofs filesystem occurs in the pool-resize path where old LZMA decoders are freed before allocating replacements. If allocation fails after some streams are replaced, the failed stream is left with a NULL state, but the global maximum dictionary size (z_erofs_lzma_max_dictsize) is still advanced, causing an invalid state that is not repaired. This can lead to an existing LZMA mount selecting a broken stream and passing NULL to the decoder reset function, skipping further resize attempts and leaving the system in an inconsistent state. The fix involves allocating all replacements before freeing old decoders, stopping at the first failure, and only advancing the global maximum after all streams are successfully resized. Additionally, each stream's dictionary capacity is recorded to avoid redundant retries.

References

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