CVE-2026-97487: Linux kernel · jfs: handle set_blocksize failures
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 12:55 UTC
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.
Exploitation evidence
Disclosed: evidence found.
CVE published 24 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.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A fix for this vulnerability is available as it has been resolved in the Linux kernel. Users should update to patched kernel versions that address this issue. Since this is a kernel-level flaw, applying the official kernel updates from the vendor or distribution is the recommended remediation.
Description
A vulnerability in the Linux kernel's JFS filesystem driver related to improper handling of set_blocksize failures has been resolved. The issue arises because JFS uses buffer_heads, which do not handle block sizes larger than PAGE_SIZE correctly. This can cause a kernel BUG_ON condition during mounting, specifically in the folio_set_bh function on the first __bread_gfp call.
References
- ubuntu.com/security/CVE-2026-97487 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-97487 (opens in a new tab)
- git.kernel.org/stable/c/a0ac22af8acca6ea6c57aff72662086cb3243b1c (opens in a new tab)
- git.kernel.org/stable/c/05107f5602751fcfd3d108c1f579eb45aabead52 (opens in a new tab)
- git.kernel.org/stable/c/153374ee67a458c77b5755d3cc57fbdc639d327e (opens in a new tab)
- nvd.nist.gov/vuln/detail/CVE-2026-97487 (opens in a new tab)
- git.kernel.org/stable/c/87d6852f06c5a29f757f7b7ad1423e4cbd0f2cad (opens in a new tab)
- git.kernel.org/stable/c/a0eaa3f4b6dcc829228752f6255f0e45cc94b273 (opens in a new tab)
- git.kernel.org/stable/c/deb9400a38849e03210c9169b777e89e74debe96 (opens in a new tab)
- git.kernel.org/stable/c/e2712fa5c02cd1b3e40d45bc8ce581f3c67bf4b4 (opens in a new tab)