In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to do sanity check on curseg->alloc_type As Wenqing Liu reported in bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=215657 - Overview UBSAN: array-index-out-of-bounds in fs/f2fs/segment.c:3460:2 when mount and operate a corrupted image - Reproduce tested on kernel 5.17-rc4, 5.17-rc6 1. mkdir test_crash 2. cd test_crash 3. unzip tmp2.zip 4. mkdir mnt 5. ./single_test.sh f2fs 2 - Kernel dump [ 46.434454] loop0: detected capacity change from 0 to 131072 [ 46.529839] F2FS-fs (loop0): Mounted with checkpoint version = 7548c2d9 [ 46.738319] ================================================================================ [ 46.738412] UBSAN: array-index-out-of-bounds in fs/f2fs/segment.c:3460:2 [ 46.738475] index 231 is out of range for type 'unsigned int [2]' [ 46.738539] CPU: 2 PID: 939 Comm: umount Not tainted 5.17.0-rc6 #1 [ 46.738547] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.13.0-1ubuntu1.1 04/01/2014 [ 46.738551] Call Trace: [ 46.738556] <TASK> [ 46.738563] dump_stack_lvl+0x47/0x5c [ 46.738581] ubsan_epilogue+0x5/0x50 [ 46.738592] __ubsan_handle_out_of_bounds+0x68/0x80 [ 46.738604] f2fs_allocate_data_block+0xdff/0xe60 [f2fs] [ 46.738819] do_write_page+0xef/0x210 [f2fs] [ 46.738934] f2fs_do_write_node_page+0x3f/0x80 [f2fs] [ 46.739038] __write_node_page+0x2b7/0x920 [f2fs] [ 46.739162] f2fs_sync_node_pages+0x943/0xb00 [f2fs] [ 46.739293] f2fs_write_checkpoint+0x7bb/0x1030 [f2fs] [ 46.739405] kill_f2fs_super+0x125/0x150 [f2fs] [ 46.739507] deactivate_locked_super+0x60/0xc0 [ 46.739517] deactivate_super+0x70/0xb0 [ 46.739524] cleanup_mnt+0x11a/0x200 [ 46.739532] __cleanup_mnt+0x16/0x20 [ 46.739538] task_work_run+0x67/0xa0 [ 46.739547] exit_to_user_mode_prepare+0x18c/0x1a0 [ 46.739559] syscall_exit_to_user_mode+0x26/0x40 [ 46.739568] do_syscall_64+0x46/0xb0 [ 46.739584] entry_SYSCALL_64_after_hwframe+0x44/0xae The root cause is we missed to do sanity check on curseg->alloc_type, result in out-of-bound accessing on sbi->block_count[] array, fix it.

The remote Ubuntu 18.04 LTS / 20.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-8919-1 advisory.

    Several security issues were discovered in the Linux kernel. An attacker could possibly use these to     compromise the system. This update corrects flaws in the following subsystems:

    - Ethernet bonding driver;

    - Network drivers;

    - F2FS file system;

    - Tracing infrastructure;

    - io_uring subsystem;

    - Networking core;

    - IUCV driver;

    - RxRPC session sockets; (CVE-2022-49149, CVE-2022-49170, CVE-2022-49182, CVE-2022-49201, CVE-2024-53187,     CVE-2024-53210, CVE-2024-56763, CVE-2026-43456, CVE-2026-52910)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Ubuntu 18.04 LTS / 20.04 LTS host has a package installed that is affected by multiple vulnerabilities as referenced in the USN-8920-1 advisory.

    Several security issues were discovered in the Linux kernel. An attacker could possibly use these to     compromise the system. This update corrects flaws in the following subsystems:

    - Ethernet bonding driver;

    - Network drivers;

    - F2FS file system;

    - Network file system (NFS) server daemon;

    - Tracing infrastructure;

    - io_uring subsystem;

    - Networking core;

    - IPv6 networking;

    - IUCV driver;

    - Netfilter;

    - RxRPC session sockets; (CVE-2022-49149, CVE-2022-49170, CVE-2022-49182, CVE-2022-49201, CVE-2024-53187,     CVE-2024-53210, CVE-2024-56763, CVE-2025-38724, CVE-2026-43456, CVE-2026-52910, CVE-2026-53131,     CVE-2026-53221)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2025-988914 advisory.

    In the Linux kernel, the following vulnerability has been resolved:

    f2fs: fix to do sanity check on curseg->alloc_type

    As Wenqing Liu reported in bugzilla:

    https://bugzilla.kernel.org/show_bug.cgi?id=215657

    - Overview     UBSAN: array-index-out-of-bounds in fs/f2fs/segment.c:3460:2 when mount and operate a corrupted image

    - Reproduce     tested on kernel 5.17-rc4, 5.17-rc6

    1. mkdir test_crash     2. cd test_crash     3. unzip tmp2.zip     4. mkdir mnt     5. ./single_test.sh f2fs 2

    - Kernel dump     [   46.434454] loop0: detected capacity change from 0 to 131072     [   46.529839] F2FS-fs (loop0): Mounted with checkpoint version = 7548c2d9     [   46.738319] ================================================================================     [   46.738412] UBSAN: array-index-out-of-bounds in fs/f2fs/segment.c:3460:2     [   46.738475] index 231 is out of range for type 'unsigned int [2]'     [   46.738539] CPU: 2 PID: 939 Comm: umount Not tainted 5.17.0-rc6 #1     [   46.738547] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.13.0-1ubuntu1.1 04/01/2014     [   46.738551] Call Trace:
    [   46.738556]  <TASK>     [   46.738563]  dump_stack_lvl+0x47/0x5c     [   46.738581]  ubsan_epilogue+0x5/0x50     [   46.738592]  __ubsan_handle_out_of_bounds+0x68/0x80     [   46.738604]  f2fs_allocate_data_block+0xdff/0xe60 [f2fs]     [   46.738819]  do_write_page+0xef/0x210 [f2fs]     [   46.738934]  f2fs_do_write_node_page+0x3f/0x80 [f2fs]     [   46.739038]  __write_node_page+0x2b7/0x920 [f2fs]     [   46.739162]  f2fs_sync_node_pages+0x943/0xb00 [f2fs]     [   46.739293]  f2fs_write_checkpoint+0x7bb/0x1030 [f2fs]     [   46.739405]  kill_f2fs_super+0x125/0x150 [f2fs]     [   46.739507]  deactivate_locked_super+0x60/0xc0     [   46.739517]  deactivate_super+0x70/0xb0     [   46.739524]  cleanup_mnt+0x11a/0x200     [   46.739532]  __cleanup_mnt+0x16/0x20     [   46.739538]  task_work_run+0x67/0xa0     [   46.739547]  exit_to_user_mode_prepare+0x18c/0x1a0     [   46.739559]  syscall_exit_to_user_mode+0x26/0x40     [   46.739568]  do_syscall_64+0x46/0xb0     [   46.739584]  entry_SYSCALL_64_after_hwframe+0x44/0xae

    The root cause is we missed to do sanity check on curseg->alloc_type,     result in out-of-bound accessing on sbi->block_count[] array, fix it.

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2025-987661 advisory.

    In the Linux kernel, the following vulnerability has been resolved:

    f2fs: fix to do sanity check on curseg->alloc_type

    As Wenqing Liu reported in bugzilla:

    https://bugzilla.kernel.org/show_bug.cgi?id=215657

    - Overview     UBSAN: array-index-out-of-bounds in fs/f2fs/segment.c:3460:2 when mount and operate a corrupted image

    - Reproduce     tested on kernel 5.17-rc4, 5.17-rc6

    1. mkdir test_crash     2. cd test_crash     3. unzip tmp2.zip     4. mkdir mnt     5. ./single_test.sh f2fs 2

    - Kernel dump     [   46.434454] loop0: detected capacity change from 0 to 131072     [   46.529839] F2FS-fs (loop0): Mounted with checkpoint version = 7548c2d9     [   46.738319] ================================================================================     [   46.738412] UBSAN: array-index-out-of-bounds in fs/f2fs/segment.c:3460:2     [   46.738475] index 231 is out of range for type 'unsigned int [2]'     [   46.738539] CPU: 2 PID: 939 Comm: umount Not tainted 5.17.0-rc6 #1     [   46.738547] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.13.0-1ubuntu1.1 04/01/2014     [   46.738551] Call Trace:
    [   46.738556]  <TASK>     [   46.738563]  dump_stack_lvl+0x47/0x5c     [   46.738581]  ubsan_epilogue+0x5/0x50     [   46.738592]  __ubsan_handle_out_of_bounds+0x68/0x80     [   46.738604]  f2fs_allocate_data_block+0xdff/0xe60 [f2fs]     [   46.738819]  do_write_page+0xef/0x210 [f2fs]     [   46.738934]  f2fs_do_write_node_page+0x3f/0x80 [f2fs]     [   46.739038]  __write_node_page+0x2b7/0x920 [f2fs]     [   46.739162]  f2fs_sync_node_pages+0x943/0xb00 [f2fs]     [   46.739293]  f2fs_write_checkpoint+0x7bb/0x1030 [f2fs]     [   46.739405]  kill_f2fs_super+0x125/0x150 [f2fs]     [   46.739507]  deactivate_locked_super+0x60/0xc0     [   46.739517]  deactivate_super+0x70/0xb0     [   46.739524]  cleanup_mnt+0x11a/0x200     [   46.739532]  __cleanup_mnt+0x16/0x20     [   46.739538]  task_work_run+0x67/0xa0     [   46.739547]  exit_to_user_mode_prepare+0x18c/0x1a0     [   46.739559]  syscall_exit_to_user_mode+0x26/0x40     [   46.739568]  do_syscall_64+0x46/0xb0     [   46.739584]  entry_SYSCALL_64_after_hwframe+0x44/0xae

    The root cause is we missed to do sanity check on curseg->alloc_type,     result in out-of-bound accessing on sbi->block_count[] array, fix it.

Tenable has extracted the preceding description block directly from the Unity Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - f2fs: fix to do sanity check on curseg->alloc_type As Wenqing Liu reported in bugzilla:
    https://bugzilla.kernel.org/show_bug.cgi?id=215657 - Overview UBSAN: array-index-out-of-bounds in     fs/f2fs/segment.c:3460:2 when mount and operate a corrupted image - Reproduce tested on kernel 5.17-rc4,     5.17-rc6 1. mkdir test_crash 2. cd test_crash 3. unzip tmp2.zip 4. mkdir mnt 5. ./single_test.sh f2fs 2 -     Kernel dump [ 46.434454] loop0: detected capacity change from 0 to 131072 [ 46.529839] F2FS-fs (loop0):
    Mounted with checkpoint version = 7548c2d9 [ 46.738319]     ================================================================================ [ 46.738412] UBSAN:
    array-index-out-of-bounds in fs/f2fs/segment.c:3460:2 [ 46.738475] index 231 is out of range for type     'unsigned int [2]' [ 46.738539] CPU: 2 PID: 939 Comm: umount Not tainted 5.17.0-rc6 #1 [ 46.738547]     Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.13.0-1ubuntu1.1 04/01/2014 [ 46.738551] Call     Trace: [ 46.738556] <TASK> [ 46.738563] dump_stack_lvl+0x47/0x5c [ 46.738581] ubsan_epilogue+0x5/0x50 [     46.738592] __ubsan_handle_out_of_bounds+0x68/0x80 [ 46.738604] f2fs_allocate_data_block+0xdff/0xe60 [f2fs]     [ 46.738819] do_write_page+0xef/0x210 [f2fs] [ 46.738934] f2fs_do_write_node_page+0x3f/0x80 [f2fs] [     46.739038] __write_node_page+0x2b7/0x920 [f2fs] [ 46.739162] f2fs_sync_node_pages+0x943/0xb00 [f2fs] [     46.739293] f2fs_write_checkpoint+0x7bb/0x1030 [f2fs] [ 46.739405] kill_f2fs_super+0x125/0x150 [f2fs] [     46.739507] deactivate_locked_super+0x60/0xc0 [ 46.739517] deactivate_super+0x70/0xb0 [ 46.739524]     cleanup_mnt+0x11a/0x200 [ 46.739532] __cleanup_mnt+0x16/0x20 [ 46.739538] task_work_run+0x67/0xa0 [     46.739547] exit_to_user_mode_prepare+0x18c/0x1a0 [ 46.739559] syscall_exit_to_user_mode+0x26/0x40 [     46.739568] do_syscall_64+0x46/0xb0 [ 46.739584] entry_SYSCALL_64_after_hwframe+0x44/0xae The root cause is     we missed to do sanity check on curseg->alloc_type, result in out-of-bound accessing on sbi->block_count[]     array, fix it. (CVE-2022-49170)

Note that Nessus relies on the presence of the package as reported by the vendor.

An update of the linux package has been released.

ID	Name	Product	Family	Type	Severity
365630	Ubuntu 18.04 LTS / 20.04 LTS : Linux kernel vulnerabilities (USN-8919-1)	Nessus	Ubuntu Local Security Checks	Local	high
365629	Ubuntu 18.04 LTS / 20.04 LTS : Linux kernel vulnerabilities (USN-8920-1)	Nessus	Ubuntu Local Security Checks	Local	high
273701	Unity Linux 20.1070a Security Update: kernel (UTSA-2025-988914)	Nessus	Unity Linux Local Security Checks	Local	high
270964	Unity Linux 20.1070e Security Update: kernel (UTSA-2025-987661)	Nessus	Unity Linux Local Security Checks	Local	high
225698	Linux Distros Unpatched Vulnerability : CVE-2022-49170	Nessus	Misc.	Local	high
151965	Photon OS 4.0: Linux PHSA-2021-4.0-0065	Nessus	PhotonOS Local Security Checks	Local	high

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