xfs: handle NULL b_addr in xfs_buf_free
In the Linux kernel, the following vulnerability has been resolved: xfs: handle NULL b_addr in xfs_buf_free When xfs_buf_alloc_backing_mem() fails, xfs_buf_free() is called with bp->b_addr still NULL. The code falls through to the folio_put path which calls virt_to_folio(NULL), dereferencing an invalid address and causing a kernel crash. Call Trace: xfs_buf_free+0x25f/0x510 xfs_buf_alloc+0xc98/0x19b0 xfs_buf_find_insert+0x55/0x14d0 xfs_buf_get_map+0x122b/0x17c0 xfbtree_init_leaf_block+0x11c/0x4a0 xfbtree_init+0x1bb/0x460 xrep_rmap_setup_scan+0x100/0x1f0 xrep_rmapbt+0x41/0xc0 Fix this by skipping folio_put() when bp->b_addr is NULL.
CVE-2026-74728
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-2026-74728
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": "5076a6040ca1613e616d84aecfaac5f932db84e0",
"lessThan": "444ff50ece93060131ad84fbd3f378723d8ac243",
"versionType": "git"
},
{
"status": "affected",
"version": "5076a6040ca1613e616d84aecfaac5f932db84e0",
"lessThan": "ccf6738adcafa5ddbddc4e71b45d8a51b86643c7",
"versionType": "git"
},
{
"status": "affected",
"version": "5076a6040ca1613e616d84aecfaac5f932db84e0",
"lessThan": "3aa0c1d23ee1b9d9b340fb2f4736536e1408d706",
"versionType": "git"
},
{
"status": "affected",
"version": "5076a6040ca1613e616d84aecfaac5f932db84e0",
"lessThan": "d852729c5f4f830fbe7413df032e29459b3daf83",
"versionType": "git"
}
],
"programFiles": [
"fs/xfs/xfs_buf.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.9"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.9",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.45",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.9",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"fs/xfs/xfs_buf.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-74728
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #46596 · Revision 1
- Added to Heist Feed
- Publisher date