ceph: fix num_ops off-by-one when crypto allocation fails
In the Linux kernel, the following vulnerability has been resolved: ceph: fix num_ops off-by-one when crypto allocation fails move_dirty_folio_in_page_array() may fail if the file is encrypted, the dirty folio is not the first in the batch, and it fails to allocate a bounce buffer to hold the ciphertext. When that happens, ceph_process_folio_batch() simply redirties the folio and flushes the current batch -- it can retry that folio in a future batch. However, if this failed folio is not contiguous with the last folio that did make it into the batch, then ceph_process_folio_batch() has already incremented `ceph_wbc->num_ops`; because it doesn't follow through and add the discontiguous folio to the array, ceph_submit_write() -- which expects that `ceph_wbc->num_ops` accurately reflects the number of contiguous ranges (and therefore the required number of "write extent" ops) in the writeback -- will panic the kernel: BUG_ON(ceph_wbc->op_idx + 1 != req->r_num_ops); This issue can be reproduced on affected kernels by writing to fscrypt-enabled CephFS file(s) with a 4KiB-written/4KiB-skipped/repeat pattern (total filesize should not matter) and gradually increasing the system's memory pressure until a bounce buffer allocation fails. Fix this crash by decrementing `ceph_wbc->num_ops` back to the correct value when move_dirty_folio_in_page_array() fails, but the folio already started counting a new (i.e. still-empty) extent. The defect corrected by this patch has existed since 2022 (
CVE-2026-46066
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-46066
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "d55207717ded95c8f2760a30e93319fa313186e6",
"lessThan": "f65a96fe2467a9b184c6ae963d95a260a202c98e",
"versionType": "git"
},
{
"status": "affected",
"version": "d55207717ded95c8f2760a30e93319fa313186e6",
"lessThan": "5dd151799d826d3736ae60c2b22cbc9d96a2a613",
"versionType": "git"
},
{
"status": "affected",
"version": "d55207717ded95c8f2760a30e93319fa313186e6",
"lessThan": "6200f41d6fcf2ac7e24866431e381cbc914560e4",
"versionType": "git"
},
{
"status": "affected",
"version": "d55207717ded95c8f2760a30e93319fa313186e6",
"lessThan": "ba12c1e578890f6337a415b7dedf476c6d455105",
"versionType": "git"
},
{
"status": "affected",
"version": "d55207717ded95c8f2760a30e93319fa313186e6",
"lessThan": "a0d9555bf9eaeba34fe6b6bb86f442fe08ba3842",
"versionType": "git"
}
],
"programFiles": [
"fs/ceph/addr.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.6"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.6",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.30",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.0.4",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/ceph/addr.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-46066
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #46324 · Revision 1
- Added to Heist Feed
- Publisher date