CVE-2026-31577 (GCVE-0-2026-31577)
Vulnerability from cvelistv5
Published
2026-04-24 14:42
Modified
2026-04-27 13:56
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
nilfs2: fix NULL i_assoc_inode dereference in nilfs_mdt_save_to_shadow_map
The DAT inode's btree node cache (i_assoc_inode) is initialized lazily
during btree operations. However, nilfs_mdt_save_to_shadow_map()
assumes i_assoc_inode is already initialized when copying dirty pages
to the shadow map during GC.
If NILFS_IOCTL_CLEAN_SEGMENTS is called immediately after mount before
any btree operation has occurred on the DAT inode, i_assoc_inode is
NULL leading to a general protection fault.
Fix this by calling nilfs_attach_btree_node_cache() on the DAT inode
in nilfs_dat_read() at mount time, ensuring i_assoc_inode is always
initialized before any GC operation can use it.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: e897be17a441fa637cd166fc3de1445131e57692 Version: e897be17a441fa637cd166fc3de1445131e57692 Version: e897be17a441fa637cd166fc3de1445131e57692 Version: e897be17a441fa637cd166fc3de1445131e57692 Version: e897be17a441fa637cd166fc3de1445131e57692 Version: e897be17a441fa637cd166fc3de1445131e57692 Version: 6c3da8c0a35bbafe359d9166269d5590f29664de Version: 605babb979c213737618b1c837e89624e5ab11fd Version: 307d021b1a7f33048b624f7aaeaa75e3eae571f1 Version: d626fcdabea2258be395a775bdbe09270e9bf73d Version: d05cc5395e36711edad8bdef6945f138d8a7097b Version: 1829b24a36ca12ca95b96d5478faeff40c17f2b6 |
||
{
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],
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"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.18"
},
{
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"status": "unaffected",
"version": "0",
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{
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"status": "unaffected",
"version": "6.6.136",
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},
{
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"status": "unaffected",
"version": "6.12.83",
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},
{
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"version": "6.18.24",
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},
{
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"version": "6.19.14",
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],
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnilfs2: fix NULL i_assoc_inode dereference in nilfs_mdt_save_to_shadow_map\n\nThe DAT inode\u0027s btree node cache (i_assoc_inode) is initialized lazily\nduring btree operations. However, nilfs_mdt_save_to_shadow_map()\nassumes i_assoc_inode is already initialized when copying dirty pages\nto the shadow map during GC.\n\nIf NILFS_IOCTL_CLEAN_SEGMENTS is called immediately after mount before\nany btree operation has occurred on the DAT inode, i_assoc_inode is\nNULL leading to a general protection fault.\n\nFix this by calling nilfs_attach_btree_node_cache() on the DAT inode\nin nilfs_dat_read() at mount time, ensuring i_assoc_inode is always\ninitialized before any GC operation can use it."
}
],
"providerMetadata": {
"dateUpdated": "2026-04-27T13:56:24.888Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/7318e3549518ce8f14776a489d86488d80d7e2c8"
},
{
"url": "https://git.kernel.org/stable/c/449ec5fc99f45974525ba9eea16b6670c45cd363"
},
{
"url": "https://git.kernel.org/stable/c/c36e206f302f1ddefed92d09ecbba070e1ae079e"
},
{
"url": "https://git.kernel.org/stable/c/41de342278ae025c99cc8d33648773f05e306cf1"
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{
"url": "https://git.kernel.org/stable/c/97fb7afec404912d967a7d4715f37742666b3084"
},
{
"url": "https://git.kernel.org/stable/c/4a4e0328edd9e9755843787d28f16dd4165f8b48"
}
],
"title": "nilfs2: fix NULL i_assoc_inode dereference in nilfs_mdt_save_to_shadow_map",
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}
}
},
"cveMetadata": {
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"assignerShortName": "Linux",
"cveId": "CVE-2026-31577",
"datePublished": "2026-04-24T14:42:08.879Z",
"dateReserved": "2026-03-09T15:48:24.119Z",
"dateUpdated": "2026-04-27T13:56:24.888Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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