CVE-2026-74728
xfs: handle NULL b_addr in xfs_buf_free
Description
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.
INFO
Published Date :
Aug. 22, 2026, 4:16 p.m.
Last Modified :
Oct. 21, 2026, 1:19 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Skip folio_put when bp->b_addr is NULL.
- Apply the kernel patch to resolve the issue.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-74728.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-74728 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-74728
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-74728 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-74728 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Oct. 21, 2026
Action Type Old Value New Value Added Affected Affected value modified. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/74xxx/CVE-2026-74728.json">CVE-2026-74728</a> Added Reference https://git.kernel.org/stable/c/3aa0c1d23ee1b9d9b340fb2f4736536e1408d706 Added Reference https://git.kernel.org/stable/c/444ff50ece93060131ad84fbd3f378723d8ac243 Added Reference https://git.kernel.org/stable/c/ccf6738adcafa5ddbddc4e71b45d8a51b86643c7 Added Reference https://git.kernel.org/stable/c/d852729c5f4f830fbe7413df032e29459b3daf83 Removed Reference https://git.kernel.org/stable/c/3aa0c1d23ee1b9d9b340fb2f4736536e1408d706 Removed Reference https://git.kernel.org/stable/c/ccf6738adcafa5ddbddc4e71b45d8a51b86643c7 Removed Reference https://git.kernel.org/stable/c/d852729c5f4f830fbe7413df032e29459b3daf83 -
CVE Translated by [email protected]
Oct. 14, 2026
Action Type Old Value New Value Added Translation Title: Linux, Description: En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta: xfs: manejar b_addr NULO en xfs_buf_free Cuando xfs_buf_alloc_backing_mem() falla, se llama a xfs_buf_free() con bp -> b_addr aún NULO. El código continúa hacia la ruta de folio_put, que llama a virt_to_folio(NULL), desreferenciando una dirección inválida y causando un fallo del kernel. Traza de Llamada: 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 Solucione esto omitiendo folio_put() cuando bp -> b_addr es NULO. -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 22, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'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': '6.18.45', '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'}] Added Description 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. Added Reference https://git.kernel.org/stable/c/3aa0c1d23ee1b9d9b340fb2f4736536e1408d706 Added Reference https://git.kernel.org/stable/c/ccf6738adcafa5ddbddc4e71b45d8a51b86643c7 Added Reference https://git.kernel.org/stable/c/d852729c5f4f830fbe7413df032e29459b3daf83