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CVE-2025-40199VulnerabilityPublished Updated

CVE-2025-40199: Linux hwe edge · In the Linux kernel, the following vulnerability has been resolved: page_pool: Fix PP_MAGIC_MASK to avoid crashing on some 32-bit arches Helge

Affects linux-hwe-edgeSource GCVE Database

0

Not known to be exploited · CVSS 7.8 Medium · fixed in 6.17.0-1011.11 : update linux-hwe-edge when convenient.

Data as of 25 Oct 2026, 19:02 UTC

CVSS 3.1 base score
7.8Medium
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.1% chance of exploitation in 30 days – higher than 4% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 6.17.0-1011.11, 6.17.0-1008.8~24.04.1, 6.17.0-1008.8 +1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 12 Nov 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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 2026-10-25.

What to do

Upgrade linux-hwe-edge to 6.17.0-1011.11, 6.17.0-1008.8~24.04.1, 6.17.0-1008.8 or 6.17.0-1007.7~24.04.1.

Affected software

ProductAffectedFixed in
linux-hwe-edgeAffected
  • <6.17.0-1007.7~24.04.1
  • <6.17.0-1008.8~24.04.1
  • <6.17.0-1008.8
  • <6.17.0-1011.11
Fixed in
  • 6.17.0-1007.7~24.04.1
  • 6.17.0-1008.8~24.04.1
  • 6.17.0-1008.8
  • 6.17.0-1011.11

AI-suggested

A fix has been implemented in the Linux kernel source to correct the PP_MAGIC_MASK and related definitions. Users should apply the official kernel updates containing this patch to affected 32-bit architectures. Since this is a kernel-level issue, updating to the fixed kernel version is the recommended remediation. Patch status is confirmed by the vendor's fix description.

Description

In the Linux kernel, the following vulnerability has been resolved: page_pool: Fix PP_MAGIC_MASK to avoid crashing on some 32-bit arches Helge reported that the introduction of PP_MAGIC_MASK let to crashes on boot on his 32-bit parisc machine. The cause of this is the mask is set too wide, so the page_pool_page_is_pp() incurs false positives which crashes the machine. Just disabling the check in page_pool_is_pp() will lead to the page_pool code itself malfunctioning; so instead of doing this, this patch changes the define for PP_DMA_INDEX_BITS to avoid mistaking arbitrary kernel pointers for page_pool-tagged pages. The fix relies on the kernel pointers that alias with the pp_magic field always being above PAGE_OFFSET. With this assumption, we can use the lowest bit of the value of PAGE_OFFSET as the upper bound of the PP_DMA_INDEX_MASK, which should avoid the false positives. Because we cannot rely on PAGE_OFFSET always being a compile-time constant, nor on it always being >0, we fall back to disabling the dma_index storage when there are not enough bits available. This leaves us in the situation we were in before the patch in the Fixes tag, but only on a subset of architecture configurations. This seems to be the best we can do until the transition to page types in complete for page_pool pages. v2: - Make sure there's at least 8 bits available and that the PAGE_OFFSET bit calculation doesn't wrap

References

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