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CVE-2026-74728: Linux kernel XFS can cause system crash
CVE-2026-74728 · published 2 months ago
Summary
A flaw in the XFS file system code of certain Ubuntu Linux kernels can cause the operating system to stop working if a memory allocation fails. This affects Ubuntu kernels such as linux-hwe-edge, linux-aws-5.0, linux-aws-5.3, linux-azure, and linux-azure-5.3. Install the latest kernel updates from your Ubuntu package source to apply the fix.
What to do
- Update linux kernel to version 7.1.9.
- Update debian linux to version 7.1.9-1.
- Update bellsoft linux-lts to version 6.12.115-r0.
- Update bellsoft linux-lts to version 6.18.46-r0.
- Update canonical linux-hwe-7.0 to version 7.0.0-42.42~24.04.1.
- Update canonical linux-riscv-7.0 to version 7.0.0-42.42.1~24.04.1.
- Update canonical linux to version 7.0.0-42.42.
- Update canonical linux-aws to version 7.0.0-1016.17.
- Update canonical linux-gcp to version 7.0.0-1016.18.
- Update canonical linux-ibm to version 7.0.0-1017.17.
- Update canonical linux-oem-7.0 to version 7.0.0-1017.17.
- Update canonical linux-oracle to version 7.0.0-1015.16.
- Update canonical linux-riscv to version 7.0.0-42.42.1.
- Update linux linux to version ccf6738adcafa5ddbddc4e71b45d8a51b86643c7 or later.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| Ubuntu:16.04:LTS | canonical | linux-hwe-edge | All versions |
| Ubuntu:18.04:LTS | canonical | linux-aws-5.0 | All versions |
| Ubuntu:18.04:LTS | canonical | linux-aws-5.3 | All versions |
| Ubuntu:18.04:LTS | canonical | linux-azure | All versions |
| Ubuntu:18.04:LTS | canonical | linux-azure-5.3 | All versions |
| Ubuntu:18.04:LTS | canonical | linux-azure-edge | All versions |
| Ubuntu:18.04:LTS | canonical | linux-gcp | All versions |
| Ubuntu:18.04:LTS | canonical | linux-gcp-5.3 | All versions |
| Ubuntu:18.04:LTS | canonical | linux-gke-4.15 | All versions |
| Ubuntu:18.04:LTS | canonical | linux-gke-5.4 | All versions |
| Ubuntu:18.04:LTS | canonical | linux-gkeop-5.4 | All versions |
| Ubuntu:18.04:LTS | canonical | linux-hwe | All versions |
| Ubuntu:18.04:LTS | canonical | linux-oem | All versions |
| Ubuntu:18.04:LTS | canonical | linux-oracle-5.0 | All versions |
| Ubuntu:18.04:LTS | canonical | linux-oracle-5.3 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-aws-5.11 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-aws-5.13 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-aws-5.8 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-azure-5.11 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-azure-5.13 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-azure-5.8 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-azure-fde | All versions |
| Ubuntu:20.04:LTS | canonical | linux-gcp-5.11 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-gcp-5.13 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-gcp-5.8 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-gke | All versions |
| Ubuntu:20.04:LTS | canonical | linux-gke-5.15 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-gkeop | All versions |
| Ubuntu:20.04:LTS | canonical | linux-gkeop-5.15 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-hwe-5.11 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-hwe-5.13 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-hwe-5.8 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-intel-5.13 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-oem-5.10 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-oem-5.13 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-oem-5.14 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-oem-5.6 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-oracle-5.11 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-oracle-5.13 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-oracle-5.8 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-raspi2 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-riscv | All versions |
| Ubuntu:20.04:LTS | canonical | linux-riscv-5.11 | All versions |
| Ubuntu:20.04:LTS | canonical | linux-riscv-5.8 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-allwinner-5.19 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-aws-5.19 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-aws-6.2 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-aws-6.5 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-azure-5.19 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-azure-6.2 | All versions |
Showing 50 of 129. Show the rest
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| Ubuntu:22.04:LTS | canonical | linux-azure-6.5 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-azure-fde-5.19 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-azure-fde-6.2 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-gcp-5.19 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-gcp-6.2 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-gcp-6.5 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-hwe-5.19 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-hwe-6.2 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-hwe-6.5 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-intel-iot-realtime | All versions |
| Ubuntu:22.04:LTS | canonical | linux-lowlatency-hwe-5.19 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-lowlatency-hwe-6.2 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-lowlatency-hwe-6.5 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-nvidia-6.2 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-nvidia-6.5 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-oem-5.17 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-oem-6.0 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-oem-6.1 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-oem-6.5 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-oracle-6.5 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-realtime | All versions |
| Ubuntu:22.04:LTS | canonical | linux-riscv-5.19 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-riscv-6.5 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-starfive-5.19 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-starfive-6.2 | All versions |
| Ubuntu:22.04:LTS | canonical | linux-starfive-6.5 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-aws-6.14 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-aws-6.17 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-aws-7.0 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-azure-6.11 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-azure-6.14 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-azure-6.17 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-azure-7.0 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-azure-fde-6.14 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-azure-fde-6.17 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-azure-fde-7.0 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-azure-nvidia-6.14 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-gcp-6.11 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-gcp-6.14 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-gcp-6.17 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-gcp-7.0 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-hwe-6.11 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-hwe-6.14 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-hwe-6.17 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-hwe-7.0 |
< 7.0.0-42.42~24.04.1 Fix: upgrade to 7.0.0-42.42~24.04.1
|
| Ubuntu:24.04:LTS | canonical | linux-lowlatency-hwe-6.11 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-nvidia-6.11 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-nvidia-6.17 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-nvidia-7.0 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-oem-6.11 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-oem-6.14 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-oem-6.17 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-oem-6.8 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-oracle-6.14 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-oracle-6.17 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-oracle-7.0 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-raspi-realtime | All versions |
| Ubuntu:24.04:LTS | canonical | linux-riscv-6.14 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-riscv-6.17 | All versions |
| Ubuntu:24.04:LTS | canonical | linux-riscv-7.0 |
< 7.0.0-42.42.1~24.04.1 Fix: upgrade to 7.0.0-42.42.1~24.04.1
|
| Ubuntu:Nvidia-BlueField:24.04:LTS | canonical | linux-bluefield | All versions |
| Ubuntu:Pro:Realtime:24.04:LTS | canonical | linux-realtime-6.14 | All versions |
| Ubuntu:Pro:Realtime:24.04:LTS | canonical | linux-realtime-6.17 | All versions |
| Ubuntu:26.04:LTS | canonical | linux |
< 7.0.0-42.42 Fix: upgrade to 7.0.0-42.42
|
| Ubuntu:26.04:LTS | canonical | linux-aws |
< 7.0.0-1016.17 Fix: upgrade to 7.0.0-1016.17
|
| Ubuntu:26.04:LTS | canonical | linux-ibm |
< 7.0.0-1017.17 Fix: upgrade to 7.0.0-1017.17
|
| Ubuntu:26.04:LTS | canonical | linux-nvidia | All versions |
| Ubuntu:26.04:LTS | canonical | linux-nvidia-bos | All versions |
| Ubuntu:26.04:LTS | canonical | linux-oem-7.0 |
< 7.0.0-1017.17 Fix: upgrade to 7.0.0-1017.17
|
| Ubuntu:26.04:LTS | canonical | linux-oracle |
< 7.0.0-1015.16 Fix: upgrade to 7.0.0-1015.16
|
| Ubuntu:26.04:LTS | canonical | linux-raspi | All versions |
| – | linux | linux |
< ccf6738adcafa5ddbddc4e71b45d8a51b86643c7 6.9 |
| Debian:13 | debian | linux | All versions |
| Debian:14 | debian | linux |
< 7.1.9-1 Fix: upgrade to 7.1.9-1
|
| Linux | linux | kernel |
>= 6.19.0, < 7.1.9 Fix: upgrade to 7.1.9
|
| Alpaquita:25 | bellsoft | linux-lts |
>= 6.12.112-r0, < 6.12.115-r0 Fix: upgrade to 6.12.115-r0
|
| Alpaquita:stream | bellsoft | linux-lts |
>= 6.18.43-r0, < 6.18.46-r0 Fix: upgrade to 6.18.46-r0
|
| Ubuntu:26.04:LTS | canonical | linux-gcp |
< 7.0.0-1016.18 Fix: upgrade to 7.0.0-1016.18
|
| Ubuntu:26.04:LTS | canonical | linux-riscv |
< 7.0.0-42.42.1 Fix: upgrade to 7.0.0-42.42.1
|
Original advisory text
BELL-CVE-2026-74728
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.
References
- https://security-tracker.debian.org/tracker/CVE-2026-74728 Vendor Advisory
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74728... Vendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-74728 Vendor Advisory
- https://git.kernel.org/stable/c/d852729c5f4f830fbe7413df032e29459b3daf83 URL
- https://git.kernel.org/stable/c/3aa0c1d23ee1b9d9b340fb2f4736536e1408d706 URL
- https://git.kernel.org/stable/c/ccf6738adcafa5ddbddc4e71b45d8a51b86643c7 URL
- https://git.kernel.org/stable/c/444ff50ece93060131ad84fbd3f378723d8ac243 URL
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git Product
- https://docs.bell-sw.com/security/cves/CVE-2026-74728 Vendor Advisory
- https://ubuntu.com/security/CVE-2026-74728 Third Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2026-74728 Third Party Advisory
- https://git.kernel.org/linus/d852729c5f4f830fbe7413df032e29459b3daf83 Third Party Advisory
- https://ubuntu.com/security/notices/USN-8959-1 Vendor Advisory
- https://ubuntu.com/security/notices/USN-8960-1 Vendor Advisory
Timeline
Published22 Aug 2026
Updated3 Nov 2026
First seen22 Aug 2026
Sources
CVE-2026-74728 · NVD
CVE-2026-74728 · MITRE
DEBIAN-CVE-2026-74728 · OSV
CVE-2026-74728 · OSV
UBUNTU-CVE-2026-74728 · OSV
BELL-CVE-2026-74728 · OSV
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