tracing: Keep the entry count when the histogram stats allocation fails

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-97920
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:19 UTC
Updated2026-10-19 10:17:42 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: tracing: Keep the entry count when the histogram stats allocation fails print_entries() uses n_entries both as the number of sort entries and as its own return value, so the -ENOMEM it stores when the stats allocation fails overwrites the count that the cleanup still needs: n_entries = tracing_map_sort_entries(map, ...); if (n_entries < 0) return n_entries; ... if (!stats) { n_entries = -ENOMEM; goto out; } ... out: tracing_map_destroy_sort_entries(sort_entries, n_entries); tracing_map_destroy_sort_entries() takes an unsigned int and loops up to it, so -ENOMEM arrives as 4294967284. It walks an array of at most map->max_elts pointers and calls destroy_sort_entry(), which dereferences and frees, on whatever lies past the end. Reading the hist file of a trigger with a .percent value, with that allocation forced to fail: BUG: KASAN: vmalloc-out-of-bounds in tracing_map_destroy_sort_entries+0xa0/0xb0 Read of size 8 at addr ffffc90000045000 by task init/1 tracing_map_destroy_sort_entries+0xa0/0xb0 hist_show+0x6f7/0x1df0 seq_read_iter+0x2b8/0x1190 vfs_read+0x176/0xa40 The buggy address belongs to a 4-page vmalloc region starting at ffffc90000041000 allocated at tracing_map_sort_entries+0x5c/0xd50 A few pages further the fault is fatal. The registers at the oops confirm the bound: the loop's end pointer less the array start, over the pointer size, is 4294967284. Return the error in a separate variable and leave n_entries holding the count, the way tracing_map_sort_entries() does on its own error path. The stats block is only entered for a value carrying .percent or .graph, which __create_val_field() has rejected since v6.3, so this cannot be reached in mainline as it stands. It becomes reachable again with "tracing: hist: let values keep the percent and graph modifiers", so it should be applied first.

Risk And Classification

EPSS: 0.002050000 probability, percentile 0.095660000 (date 2026-10-05)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 93454d1a306ea975294b861d32ffa1e44b20c733 89c978d67ad01ce28223944cc58e95feea177b35 git Not specified
CNA Linux Linux affected abaa5258ce5e5887a9de049f50a85dc023391a1c fe05eeed27128e17d38dbc0af02e4470bcecda89 git Not specified
CNA Linux Linux affected abaa5258ce5e5887a9de049f50a85dc023391a1c 9bd8321f5370295d1ae96dd17d43be3c9edd441b git Not specified
CNA Linux Linux affected abaa5258ce5e5887a9de049f50a85dc023391a1c c80b2a8067d58ff7d268ceef781c68b37a16c321 git Not specified
CNA Linux Linux affected abaa5258ce5e5887a9de049f50a85dc023391a1c 17e87ce55f877efff1b08fe509e8bf91378cbbc9 git Not specified
CNA Linux Linux affected abaa5258ce5e5887a9de049f50a85dc023391a1c 06f5634ec5584954177f9a22e36b3bfb398a971b git Not specified
CNA Linux Linux affected 6.1.23 6.1.189 semver Not specified
CNA Linux Linux affected 6.2 Not specified
CNA Linux Linux unaffected 6.2 semver Not specified
CNA Linux Linux unaffected 6.1.189 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.158 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.111 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/89c978d67ad01ce28223944cc58e95feea177b35 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/17e87ce55f877efff1b08fe509e8bf91378cbbc9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fe05eeed27128e17d38dbc0af02e4470bcecda89 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9bd8321f5370295d1ae96dd17d43be3c9edd441b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/06f5634ec5584954177f9a22e36b3bfb398a971b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c80b2a8067d58ff7d268ceef781c68b37a16c321 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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