CVE-2026-80809 (GCVE-0-2026-80809)
Vulnerability from cvelistv5
Published
2026-09-04 15:13
Modified
2026-09-04 15:13
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
ocfs2: fix missing metadata reservation for large xattrs
[BUG]
lsetxattr() panics the kernel when setting a large xattr value on a
fragmented filesystem where the file already has an external xattr
block.
[CAUSE]
ocfs2_calc_xattr_set_need() never reserves metadata blocks for a new
xattr value's extent tree when the file already has an external xattr
block. The not_found path leaves meta_add at zero, so meta_ac is NULL
when ocfs2_xattr_extend_allocation() runs.
A new value root has room for a single extent record. On a fragmented
filesystem, the allocator cannot satisfy the xattr value in one
contiguous run, so each non-contiguous run requires its own extent
record. When the value root's extent list is full and meta_ac is NULL,
ocfs2_add_clusters_in_btree() returns RESTART_META, and
ocfs2_xattr_extend_allocation() hits BUG_ON(why == RESTART_META).
[FIX]
The case where no xattr block exists yet already calls
ocfs2_extend_meta_needed(&def_xv.xv.xr_list) to reserve value tree
metadata. Add the same reservation to the case where an xattr block
already exists, making the two cases consistent.
Replace the BUG_ON with a -ENOSPC return so that if RESTART_META is
returned despite the reservation, the error propagates to userspace
instead of panicking the kernel.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: a78f9f4668949a6588b8872f162e86685c63d023 Version: a78f9f4668949a6588b8872f162e86685c63d023 Version: a78f9f4668949a6588b8872f162e86685c63d023 Version: a78f9f4668949a6588b8872f162e86685c63d023 Version: a78f9f4668949a6588b8872f162e86685c63d023 Version: a78f9f4668949a6588b8872f162e86685c63d023 Version: a78f9f4668949a6588b8872f162e86685c63d023 Version: a78f9f4668949a6588b8872f162e86685c63d023 Version: a78f9f4668949a6588b8872f162e86685c63d023 Version: 92f61d8a31e270f9391e7bcc0ac638bd4262a8e0 Version: 2.6.34.2 ≤ |
||
{
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix missing metadata reservation for large xattrs\n\n[BUG]\nlsetxattr() panics the kernel when setting a large xattr value on a\nfragmented filesystem where the file already has an external xattr\nblock.\n\n[CAUSE]\nocfs2_calc_xattr_set_need() never reserves metadata blocks for a new\nxattr value\u0027s extent tree when the file already has an external xattr\nblock. The not_found path leaves meta_add at zero, so meta_ac is NULL\nwhen ocfs2_xattr_extend_allocation() runs.\n\nA new value root has room for a single extent record. On a fragmented\nfilesystem, the allocator cannot satisfy the xattr value in one\ncontiguous run, so each non-contiguous run requires its own extent\nrecord. When the value root\u0027s extent list is full and meta_ac is NULL,\nocfs2_add_clusters_in_btree() returns RESTART_META, and\nocfs2_xattr_extend_allocation() hits BUG_ON(why == RESTART_META).\n\n[FIX]\nThe case where no xattr block exists yet already calls\nocfs2_extend_meta_needed(\u0026def_xv.xv.xr_list) to reserve value tree\nmetadata. Add the same reservation to the case where an xattr block\nalready exists, making the two cases consistent.\n\nReplace the BUG_ON with a -ENOSPC return so that if RESTART_META is\nreturned despite the reservation, the error propagates to userspace\ninstead of panicking the kernel."
}
],
"providerMetadata": {
"dateUpdated": "2026-09-04T15:13:29.769Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/743ac908282ac97ef6e73ac3a92df2cc8ecb7479"
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{
"url": "https://git.kernel.org/stable/c/04ba24bce61c917b5b3009f0db470cbb72e26a0d"
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{
"url": "https://git.kernel.org/stable/c/b4663405ae29d36011cd712d243456f3f9ab700d"
},
{
"url": "https://git.kernel.org/stable/c/6a009f1e61b11d9e23d3c5aa1dacfb010945da45"
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{
"url": "https://git.kernel.org/stable/c/b9eb5c9fdd81d82976d4d5be2b2458eb7d7e46ec"
},
{
"url": "https://git.kernel.org/stable/c/6176313622e34fa3e2b66b9d0682d1e1c6b365c5"
},
{
"url": "https://git.kernel.org/stable/c/a3ccb57086dd7652d5ecb826486144198a98a8e9"
},
{
"url": "https://git.kernel.org/stable/c/50f0cbec45b0f3fd7e1263d01916518dbf31eb3f"
},
{
"url": "https://git.kernel.org/stable/c/0cdc7dde00ec63ac714271fa8b2918d630b8da1a"
}
],
"title": "ocfs2: fix missing metadata reservation for large xattrs",
"x_generator": {
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}
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"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-80809",
"datePublished": "2026-09-04T15:13:29.769Z",
"dateReserved": "2026-08-26T14:34:25.794Z",
"dateUpdated": "2026-09-04T15:13:29.769Z",
"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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