ftrace: Do not over-allocate ftrace memory

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Summary

CVECVE-2026-23052
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-02-04 17:16:15 UTC
Updated2026-07-04 12:16:54 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ftrace: Do not over-allocate ftrace memory The pg_remaining calculation in ftrace_process_locs() assumes that ENTRIES_PER_PAGE multiplied by 2^order equals the actual capacity of the allocated page group. However, ENTRIES_PER_PAGE is PAGE_SIZE / ENTRY_SIZE (integer division). When PAGE_SIZE is not a multiple of ENTRY_SIZE (e.g. 4096 / 24 = 170 with remainder 16), high-order allocations (like 256 pages) have significantly more capacity than 256 * 170. This leads to pg_remaining being underestimated, which in turn makes skip (derived from skipped - pg_remaining) larger than expected, causing the WARN(skip != remaining) to trigger. Extra allocated pages for ftrace: 2 with 654 skipped WARNING: CPU: 0 PID: 0 at kernel/trace/ftrace.c:7295 ftrace_process_locs+0x5bf/0x5e0 A similar problem in ftrace_allocate_records() can result in allocating too many pages. This can trigger the second warning in ftrace_process_locs(). Extra allocated pages for ftrace WARNING: CPU: 0 PID: 0 at kernel/trace/ftrace.c:7276 ftrace_process_locs+0x548/0x580 Use the actual capacity of a page group to determine the number of pages to allocate. Have ftrace_allocate_pages() return the number of allocated pages to avoid having to calculate it. Use the actual page group capacity when validating the number of unused pages due to skipped entries. Drop the definition of ENTRIES_PER_PAGE since it is no longer used.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected dc06779d338de4e5a46166a93ec124222e09f40a bf802b936a7b269917e4dc233e49f6a928db8286 git Not specified
CNA Linux Linux affected 2a6ce8bddd8aafa61aaa705e76eae810f22429be 23936d19e4383c8dfb03931f032473d4baf92533 git Not specified
CNA Linux Linux affected 4a3efc6baff931da9a85c6d2e42c87bd9a827399 9aef476717994e96dadfb359641c4b82b521aa36 git Not specified
CNA Linux Linux affected 4a3efc6baff931da9a85c6d2e42c87bd9a827399 be55257fab181b93af38f8c4b1b3cb453a78d742 git Not specified
CNA Linux Linux affected 6.15 Not specified
CNA Linux Linux unaffected 6.15 semver Not specified
CNA Linux Linux unaffected 6.18.7 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/23936d19e4383c8dfb03931f032473d4baf92533 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bf802b936a7b269917e4dc233e49f6a928db8286 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/be55257fab181b93af38f8c4b1b3cb453a78d742 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9aef476717994e96dadfb359641c4b82b521aa36 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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