HighFix available

gfs2: Validate i_depth for exhash directories

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: gfs2: Validate i_depth for exhash directories A fuzzer test introduced corruption that ends up with a depth of 0 in dir_e_read(), causing an undefined shift by 32 at: index = hash >> (32 - dip->i_depth); As calculated in an open-coded way in dir_make_exhash(), the minimum depth for an exhash directory is ilog2(sdp->sd_hash_ptrs) and 0 is invalid as sdp->sd_hash_ptrs is fixed as sdp->bsize / 16 at mount time. So we can avoid the undefined behaviour by checking for depth values lower than the minimum in gfs2_dinode_in(). Values greater than the maximum are already being checked for there. Also switch the calculation in dir_make_exhash() to use ilog2() to clarify how the depth is calculated. Tested with the syzkaller repro.c and xfstests '-g quick'.

Products: Kernel
Affected versions: Not specified
Fixed versions: 5.10.258, 5.15.209, 6.1.175, 6.12.43, 6.15.11, 6.16.2, 6.6.134
CVEs: CVE-2025-38710
Confirmed fixed CVEs: Not specified
Updated in this feed: 8 Nov 2026, 01:37 UTC · Revision 1

Source evidence

gfs2: Validate i_depth for exhash directories

core-osv · Original source

Published 4 Sept 2025, 15:33 UTC

osv:CVE-2025-38710

Kernel

Fixed versions: 5.10.258, 5.15.209, 6.1.175, 6.6.134, 6.12.43, 6.15.11, 6.16.2

Complete source record

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  "url": "https://osv.dev/vulnerability/CVE-2025-38710",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "gfs2: Validate i_depth for exhash directories",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: gfs2: Validate i_depth for exhash directories A fuzzer test introduced corruption that ends up with a depth of 0 in dir_e_read(), causing an undefined shift by 32 at: index = hash >> (32 - dip->i_depth); As calculated in an open-coded way in dir_make_exhash(), the minimum depth for an exhash directory is ilog2(sdp->sd_hash_ptrs) and 0 is invalid as sdp->sd_hash_ptrs is fixed as sdp->bsize / 16 at mount time. So we can avoid the undefined behaviour by checking for depth values lower than the minimum in gfs2_dinode_in(). Values greater than the maximum are already being checked for there. Also switch the calculation in dir_make_exhash() to use ilog2() to clarify how the depth is calculated. Tested with the syzkaller repro.c and xfstests '-g quick'.",
    "evidence": "osv:CVE-2025-38710",
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      "modified": "2026-10-28T02:30:52.517040232Z",
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      "references": [
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        "https://nvd.nist.gov/vuln/detail/CVE-2025-38710",
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  "source_id": "core-osv",
  "document_id": 521413,
  "published_at": "2025-09-04T15:33:00.629+00:00"
}