CVE-2026-74728

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74728", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.929Z", "datePublished": "2026-08-22T15:33:18.412Z", "dateUpdated": "2026-10-21T12:46:17.289Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-21T12:46:17.289Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: handle NULL b_addr in xfs_buf_free\n\nWhen xfs_buf_alloc_backing_mem() fails, xfs_buf_free() is called with\nbp->b_addr still NULL. The code falls through to the folio_put path\nwhich calls virt_to_folio(NULL), dereferencing an invalid address and\ncausing a kernel crash.\n\n Call Trace:\n xfs_buf_free+0x25f/0x510\n xfs_buf_alloc+0xc98/0x19b0\n xfs_buf_find_insert+0x55/0x14d0\n xfs_buf_get_map+0x122b/0x17c0\n xfbtree_init_leaf_block+0x11c/0x4a0\n xfbtree_init+0x1bb/0x460\n xrep_rmap_setup_scan+0x100/0x1f0\n xrep_rmapbt+0x41/0xc0\n\nFix this by skipping folio_put() when bp->b_addr is NULL."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/xfs/xfs_buf.c"], "versions": [{"version": "5076a6040ca1613e616d84aecfaac5f932db84e0", "lessThan": "444ff50ece93060131ad84fbd3f378723d8ac243", "status": "affected", "versionType": "git"}, {"version": "5076a6040ca1613e616d84aecfaac5f932db84e0", "lessThan": "ccf6738adcafa5ddbddc4e71b45d8a51b86643c7", "status": "affected", "versionType": "git"}, {"version": "5076a6040ca1613e616d84aecfaac5f932db84e0", "lessThan": "3aa0c1d23ee1b9d9b340fb2f4736536e1408d706", "status": "affected", "versionType": "git"}, {"version": "5076a6040ca1613e616d84aecfaac5f932db84e0", "lessThan": "d852729c5f4f830fbe7413df032e29459b3daf83", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/xfs/xfs_buf.c"], "versions": [{"version": "6.9", "status": "affected"}, {"version": "0", "lessThan": "6.9", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.114", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.45", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.9", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "6.12.114"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "6.18.45"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "7.1.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/444ff50ece93060131ad84fbd3f378723d8ac243"}, {"url": "https://git.kernel.org/stable/c/ccf6738adcafa5ddbddc4e71b45d8a51b86643c7"}, {"url": "https://git.kernel.org/stable/c/3aa0c1d23ee1b9d9b340fb2f4736536e1408d706"}, {"url": "https://git.kernel.org/stable/c/d852729c5f4f830fbe7413df032e29459b3daf83"}], "title": "xfs: handle NULL b_addr in xfs_buf_free", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["fs/xfs/xfs_buf.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "444ff50ece93060131ad84fbd3f378723d8ac243", "status": "affected", "version": "5076a6040ca1613e616d84aecfaac5f932db84e0", "versionType": "git"}, {"lessThan": "ccf6738adcafa5ddbddc4e71b45d8a51b86643c7", "status": "affected", "version": "5076a6040ca1613e616d84aecfaac5f932db84e0", "versionType": "git"}, {"lessThan": "3aa0c1d23ee1b9d9b340fb2f4736536e1408d706", "status": "affected", "version": "5076a6040ca1613e616d84aecfaac5f932db84e0", "versionType": "git"}, {"lessThan": "d852729c5f4f830fbe7413df032e29459b3daf83", "status": "affected", "version": "5076a6040ca1613e616d84aecfaac5f932db84e0", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["fs/xfs/xfs_buf.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.9"}, {"lessThan": "6.9", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.114", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.45", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.9", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: handle NULL b_addr in xfs_buf_free\n\nWhen xfs_buf_alloc_backing_mem() fails, xfs_buf_free() is called with\nbp->b_addr still NULL. The code falls through to the folio_put path\nwhich calls virt_to_folio(NULL), dereferencing an invalid address and\ncausing a kernel crash.\n\n Call Trace:\n xfs_buf_free+0x25f/0x510\n xfs_buf_alloc+0xc98/0x19b0\n xfs_buf_find_insert+0x55/0x14d0\n xfs_buf_get_map+0x122b/0x17c0\n xfbtree_init_leaf_block+0x11c/0x4a0\n xfbtree_init+0x1bb/0x460\n xrep_rmap_setup_scan+0x100/0x1f0\n xrep_rmapbt+0x41/0xc0\n\nFix this by skipping folio_put() when bp->b_addr is NULL."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nxfs: manejar b_addr NULO en xfs_buf_free\n\nCuando xfs_buf_alloc_backing_mem() falla, se llama a xfs_buf_free() con bp -> b_addr a\u00fan NULO. El c\u00f3digo contin\u00faa hacia la ruta de folio_put, que llama a virt_to_folio(NULL), desreferenciando una direcci\u00f3n inv\u00e1lida y causando un fallo del kernel.\n\nTraza de Llamada:\n xfs_buf_free+0x25f/0x510\n xfs_buf_alloc+0xc98/0x19b0\n xfs_buf_find_insert+0x55/0x14d0\n xfs_buf_get_map+0x122b/0x17c0\n xfbtree_init_leaf_block+0x11c/0x4a0\n xfbtree_init+0x1bb/0x460\n xrep_rmap_setup_scan+0x100/0x1f0\n xrep_rmapbt+0x41/0xc0\n\nSolucione esto omitiendo folio_put() cuando bp -> b_addr es NULO."}], "id": "CVE-2026-74728", "lastModified": "2026-10-21T13:19:50.077", "metrics": {}, "published": "2026-08-22T16:16:47.930", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3aa0c1d23ee1b9d9b340fb2f4736536e1408d706"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/444ff50ece93060131ad84fbd3f378723d8ac243"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ccf6738adcafa5ddbddc4e71b45d8a51b86643c7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d852729c5f4f830fbe7413df032e29459b3daf83"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: xfs: handle NULL b_addr in xfs_buf_free", "id": "2521455", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2521455"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nxfs: handle NULL b_addr in xfs_buf_free\nWhen xfs_buf_alloc_backing_mem() fails, xfs_buf_free() is called with\nbp->b_addr still NULL. The code falls through to the folio_put path\nwhich calls virt_to_folio(NULL), dereferencing an invalid address and\ncausing a kernel crash.\nCall Trace:\nxfs_buf_free+0x25f/0x510\nxfs_buf_alloc+0xc98/0x19b0\nxfs_buf_find_insert+0x55/0x14d0\nxfs_buf_get_map+0x122b/0x17c0\nxfbtree_init_leaf_block+0x11c/0x4a0\nxfbtree_init+0x1bb/0x460\nxrep_rmap_setup_scan+0x100/0x1f0\nxrep_rmapbt+0x41/0xc0\nFix this by skipping folio_put() when bp->b_addr is NULL.", "A flaw was found in the Linux kernel's XFS filesystem. When the system attempts to allocate memory for an XFS buffer and that allocation fails, the `xfs_buf_free` function is called with a null buffer address. This leads to a null pointer dereference, causing the kernel to crash. This vulnerability can result in a Denial of Service (DoS) for the affected system."], "name": "CVE-2026-74728", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74728\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74728\nhttps://lore.kernel.org/linux-cve-announce/2026082241-CVE-2026-74728-3d34@gregkh/T"], "threat_severity": "Low"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[5076a6040ca1613e616d84aecfaac5f932db84e0,ccf6738adcafa5ddbddc4e71b45d8a51b86643c7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[5076a6040ca1613e616d84aecfaac5f932db84e0,3aa0c1d23ee1b9d9b340fb2f4736536e1408d706)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[5076a6040ca1613e616d84aecfaac5f932db84e0,d852729c5f4f830fbe7413df032e29459b3daf83)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.9"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.9)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.45,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.9,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2,*)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-22T19:00:14.809623+00:00", "updated": "2026-08-25T14:15:05.824046+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-476"]}