page_pool: Fix PP_MAGIC_MASK to avoid crashing on some 32-bit arches
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
CVE-2025-40199
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2025-40199
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4f51fb0d257ff4d406ec27966902de075e3b118e",
"lessThan": "15b8a5b4cdc16e9a8bb2a548e12a0fd92997605a",
"versionType": "git"
},
{
"status": "affected",
"version": "ee62ce7a1d909ccba0399680a03c2dee83bcae95",
"lessThan": "f62934cea32c8f7b11b747975d69bf5afe4264cf",
"versionType": "git"
},
{
"status": "affected",
"version": "ee62ce7a1d909ccba0399680a03c2dee83bcae95",
"lessThan": "95920c2ed02bde551ab654e9749c2ca7bc3100e0",
"versionType": "git"
},
{
"status": "affected",
"version": "c30ae60f41f9edd6e1b5cad41cf28ce04dae39e4",
"versionType": "git"
},
{
"status": "affected",
"version": "6.12.34",
"lessThan": "6.12.54",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.15.3",
"lessThan": "6.16",
"versionType": "semver"
}
],
"programFiles": [
"include/linux/mm.h",
"net/core/page_pool.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.16"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.16",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.54",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.17.4",
"versionType": "semver",
"lessThanOrEqual": "6.17.*"
},
{
"status": "unaffected",
"version": "6.18",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"include/linux/mm.h",
"net/core/page_pool.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2025-40199
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #30691 · Revision 1
- Added to Heist Feed
- Publisher date