CVE-2026-74728

Full vulnerability record from the local CVENow database.

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.

Severity

Not scored

CVSS score

Not available

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-08-22 16:16:47.930000

Last modified

2026-10-21 13:19:50.077000

View original CVE JSON

{
  "id": "CVE-2026-74728",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-08-22T16:16:47.930",
  "lastModified": "2026-10-21T13:19:50.077",
  "vulnStatus": "Received",
  "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 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.\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."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "fs/xfs/xfs_buf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "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",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "fs/xfs/xfs_buf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "6.9",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "6.9",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.114",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.45",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.1.9",
              "lessThanOrEqual": "7.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {},
  "references": [
    {
      "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",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}