In the Linux kernel, the following vulnerability has been resolved: bpf, cgroup: Fix kernel BUG in purge_effective_progs Syzkaller reported a triggered kernel BUG as follows: ------------[ cut here ]------------ kernel BUG at kernel/bpf/cgroup.c:925! invalid opcode: 0000 [#1] PREEMPT SMP NOPTI CPU: 1 PID: 194 Comm: detach Not tainted 5.19.0-14184-g69dac8e431af #8 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014 RIP: 0010:__cgroup_bpf_detach+0x1f2/0x2a0 Code: 00 e8 92 60 30 00 84 c0 75 d8 4c 89 e0 31 f6 85 f6 74 19 42 f6 84 28 48 05 00 00 02 75 0e 48 8b 80 c0 00 00 00 48 85 c0 75 e5 <0f> 0b 48 8b 0c5 RSP: 0018:ffffc9000055bdb0 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffff888100ec0800 RCX: ffffc900000f1000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff888100ec4578 RBP: 0000000000000000 R08: ffff888100ec0800 R09: 0000000000000040 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888100ec4000 R13: 000000000000000d R14: ffffc90000199000 R15: ffff888100effb00 FS: 00007f68213d2b80(0000) GS:ffff88813bc80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055f74a0e5850 CR3: 0000000102836000 CR4: 00000000000006e0 Call Trace: <TASK> cgroup_bpf_prog_detach+0xcc/0x100 __sys_bpf+0x2273/0x2a00 __x64_sys_bpf+0x17/0x20 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f68214dbcb9 Code: 08 44 89 e0 5b 41 5c c3 66 0f 1f 84 00 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff8 RSP: 002b:00007ffeb487db68 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX: 000000000000000b RCX: 00007f68214dbcb9 RDX: 0000000000000090 RSI: 00007ffeb487db70 RDI: 0000000000000009 RBP: 0000000000000003 R08: 0000000000000012 R09: 0000000b00000003 R10: 00007ffeb487db70 R11: 0000000000000246 R12: 00007ffeb487dc20 R13: 0000000000000004 R14: 0000000000000001 R15: 000055f74a1011b0 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- Repetition steps: For the following cgroup tree, root | cg1 | cg2 1. attach prog2 to cg2, and then attach prog1 to cg1, both bpf progs attach type is NONE or OVERRIDE. 2. write 1 to /proc/thread-self/fail-nth for failslab. 3. detach prog1 for cg1, and then kernel BUG occur. Failslab injection will cause kmalloc fail and fall back to purge_effective_progs. The problem is that cg2 have attached another prog, so when go through cg2 layer, iteration will add pos to 1, and subsequent operations will be skipped by the following condition, and cg will meet NULL in the end. `if (pos && !(cg->bpf.flags[atype] & BPF_F_ALLOW_MULTI))` The NULL cg means no link or prog match, this is as expected, and it's not a bug. So here just skip the no match situation.

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-011011 advisory.

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

    bpf, cgroup: Fix kernel BUG in purge_effective_progs

    Syzkaller reported a triggered kernel BUG as follows:

      ------------[ cut here ]------------       kernel BUG at kernel/bpf/cgroup.c:925!       invalid opcode: 0000 [#1] PREEMPT SMP NOPTI       CPU: 1 PID: 194 Comm: detach Not tainted 5.19.0-14184-g69dac8e431af #8       Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS       rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014       RIP: 0010:__cgroup_bpf_detach+0x1f2/0x2a0       Code: 00 e8 92 60 30 00 84 c0 75 d8 4c 89 e0 31 f6 85 f6 74 19 42 f6 84       28 48 05 00 00 02 75 0e 48 8b 80 c0 00 00 00 48 85 c0 75 e5 <0f> 0b 48       8b 0c5       RSP: 0018:ffffc9000055bdb0 EFLAGS: 00000246       RAX: 0000000000000000 RBX: ffff888100ec0800 RCX: ffffc900000f1000       RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff888100ec4578       RBP: 0000000000000000 R08: ffff888100ec0800 R09: 0000000000000040       R10: 0000000000000000 R11: 0000000000000000 R12: ffff888100ec4000       R13: 000000000000000d R14: ffffc90000199000 R15: ffff888100effb00       FS:  00007f68213d2b80(0000) GS:ffff88813bc80000(0000)       knlGS:0000000000000000       CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033       CR2: 000055f74a0e5850 CR3: 0000000102836000 CR4: 00000000000006e0       Call Trace:
       <TASK>        cgroup_bpf_prog_detach+0xcc/0x100
       __sys_bpf+0x2273/0x2a00
       __x64_sys_bpf+0x17/0x20        do_syscall_64+0x3b/0x90        entry_SYSCALL_64_after_hwframe+0x63/0xcd       RIP: 0033:0x7f68214dbcb9       Code: 08 44 89 e0 5b 41 5c c3 66 0f 1f 84 00 00 00 00 00 48 89 f8 48 89       f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01       f0 ff8       RSP: 002b:00007ffeb487db68 EFLAGS: 00000246 ORIG_RAX: 0000000000000141       RAX: ffffffffffffffda RBX: 000000000000000b RCX: 00007f68214dbcb9       RDX: 0000000000000090 RSI: 00007ffeb487db70 RDI: 0000000000000009       RBP: 0000000000000003 R08: 0000000000000012 R09: 0000000b00000003       R10: 00007ffeb487db70 R11: 0000000000000246 R12: 00007ffeb487dc20       R13: 0000000000000004 R14: 0000000000000001 R15: 000055f74a1011b0        </TASK>       Modules linked in:
      ---[ end trace 0000000000000000 ]---

    Repetition steps:

    For the following cgroup tree,

      root        |       cg1        |       cg2

      1. attach prog2 to cg2, and then attach prog1 to cg1, both bpf progs          attach type is NONE or OVERRIDE.
      2. write 1 to /proc/thread-self/fail-nth for failslab.
      3. detach prog1 for cg1, and then kernel BUG occur.

    Failslab injection will cause kmalloc fail and fall back to     purge_effective_progs. The problem is that cg2 have attached another prog,     so when go through cg2 layer, iteration will add pos to 1, and subsequent     operations will be skipped by the following condition, and cg will meet     NULL in the end.

      `if (pos && !(cg->bpf.flags[atype] & BPF_F_ALLOW_MULTI))`

    The NULL cg means no link or prog match, this is as expected, and it's not     a bug. So here just skip the no match situation.

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-2026-006899 advisory.

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

    bpf, cgroup: Fix kernel BUG in purge_effective_progs

    Syzkaller reported a triggered kernel BUG as follows:

      ------------[ cut here ]------------       kernel BUG at kernel/bpf/cgroup.c:925!       invalid opcode: 0000 [#1] PREEMPT SMP NOPTI       CPU: 1 PID: 194 Comm: detach Not tainted 5.19.0-14184-g69dac8e431af #8       Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS       rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014       RIP: 0010:__cgroup_bpf_detach+0x1f2/0x2a0       Code: 00 e8 92 60 30 00 84 c0 75 d8 4c 89 e0 31 f6 85 f6 74 19 42 f6 84       28 48 05 00 00 02 75 0e 48 8b 80 c0 00 00 00 48 85 c0 75 e5 <0f> 0b 48       8b 0c5       RSP: 0018:ffffc9000055bdb0 EFLAGS: 00000246       RAX: 0000000000000000 RBX: ffff888100ec0800 RCX: ffffc900000f1000       RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff888100ec4578       RBP: 0000000000000000 R08: ffff888100ec0800 R09: 0000000000000040       R10: 0000000000000000 R11: 0000000000000000 R12: ffff888100ec4000       R13: 000000000000000d R14: ffffc90000199000 R15: ffff888100effb00       FS:  00007f68213d2b80(0000) GS:ffff88813bc80000(0000)       knlGS:0000000000000000       CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033       CR2: 000055f74a0e5850 CR3: 0000000102836000 CR4: 00000000000006e0       Call Trace:
       <TASK>        cgroup_bpf_prog_detach+0xcc/0x100
       __sys_bpf+0x2273/0x2a00
       __x64_sys_bpf+0x17/0x20        do_syscall_64+0x3b/0x90        entry_SYSCALL_64_after_hwframe+0x63/0xcd       RIP: 0033:0x7f68214dbcb9       Code: 08 44 89 e0 5b 41 5c c3 66 0f 1f 84 00 00 00 00 00 48 89 f8 48 89       f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01       f0 ff8       RSP: 002b:00007ffeb487db68 EFLAGS: 00000246 ORIG_RAX: 0000000000000141       RAX: ffffffffffffffda RBX: 000000000000000b RCX: 00007f68214dbcb9       RDX: 0000000000000090 RSI: 00007ffeb487db70 RDI: 0000000000000009       RBP: 0000000000000003 R08: 0000000000000012 R09: 0000000b00000003       R10: 00007ffeb487db70 R11: 0000000000000246 R12: 00007ffeb487dc20       R13: 0000000000000004 R14: 0000000000000001 R15: 000055f74a1011b0        </TASK>       Modules linked in:
      ---[ end trace 0000000000000000 ]---

    Repetition steps:

    For the following cgroup tree,

      root        |       cg1        |       cg2

      1. attach prog2 to cg2, and then attach prog1 to cg1, both bpf progs          attach type is NONE or OVERRIDE.
      2. write 1 to /proc/thread-self/fail-nth for failslab.
      3. detach prog1 for cg1, and then kernel BUG occur.

    Failslab injection will cause kmalloc fail and fall back to     purge_effective_progs. The problem is that cg2 have attached another prog,     so when go through cg2 layer, iteration will add pos to 1, and subsequent     operations will be skipped by the following condition, and cg will meet     NULL in the end.

      `if (pos && !(cg->bpf.flags[atype] & BPF_F_ALLOW_MULTI))`

    The NULL cg means no link or prog match, this is as expected, and it's not     a bug. So here just skip the no match situation.

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.

  - In the Linux kernel, the following vulnerability has been resolved: bpf, cgroup: Fix kernel BUG in     purge_effective_progs Syzkaller reported a triggered kernel BUG as follows: ------------[ cut here     ]------------ kernel BUG at kernel/bpf/cgroup.c:925! invalid opcode: 0000 [#1] PREEMPT SMP NOPTI CPU: 1     PID: 194 Comm: detach Not tainted 5.19.0-14184-g69dac8e431af #8 Hardware name: QEMU Standard PC (i440FX +     PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014 RIP:
    0010:__cgroup_bpf_detach+0x1f2/0x2a0 Code: 00 e8 92 60 30 00 84 c0 75 d8 4c 89 e0 31 f6 85 f6 74 19 42 f6     84 28 48 05 00 00 02 75 0e 48 8b 80 c0 00 00 00 48 85 c0 75 e5 <0f> 0b 48 8b 0c5 RSP:
    0018:ffffc9000055bdb0 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffff888100ec0800 RCX: ffffc900000f1000     RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff888100ec4578 RBP: 0000000000000000 R08:
    ffff888100ec0800 R09: 0000000000000040 R10: 0000000000000000 R11: 0000000000000000 R12: ffff888100ec4000     R13: 000000000000000d R14: ffffc90000199000 R15: ffff888100effb00 FS: 00007f68213d2b80(0000)     GS:ffff88813bc80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2:
    000055f74a0e5850 CR3: 0000000102836000 CR4: 00000000000006e0 Call Trace: <TASK>     cgroup_bpf_prog_detach+0xcc/0x100 __sys_bpf+0x2273/0x2a00 __x64_sys_bpf+0x17/0x20 do_syscall_64+0x3b/0x90     entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f68214dbcb9 Code: 08 44 89 e0 5b 41 5c c3 66 0f 1f     84 00 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0     ff8 RSP: 002b:00007ffeb487db68 EFLAGS: 00000246 ORIG_RAX: 0000000000000141 RAX: ffffffffffffffda RBX:
    000000000000000b RCX: 00007f68214dbcb9 RDX: 0000000000000090 RSI: 00007ffeb487db70 RDI: 0000000000000009     RBP: 0000000000000003 R08: 0000000000000012 R09: 0000000b00000003 R10: 00007ffeb487db70 R11:
    0000000000000246 R12: 00007ffeb487dc20 R13: 0000000000000004 R14: 0000000000000001 R15: 000055f74a1011b0     </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- Repetition steps: For the following cgroup     tree, root | cg1 | cg2 1. attach prog2 to cg2, and then attach prog1 to cg1, both bpf progs attach type is     NONE or OVERRIDE. 2. write 1 to /proc/thread-self/fail-nth for failslab. 3. detach prog1 for cg1, and then     kernel BUG occur. Failslab injection will cause kmalloc fail and fall back to purge_effective_progs. The     problem is that cg2 have attached another prog, so when go through cg2 layer, iteration will add pos to 1,     and subsequent operations will be skipped by the following condition, and cg will meet NULL in the end.
    `if (pos && !(cg->bpf.flags[atype] & BPF_F_ALLOW_MULTI))` The NULL cg means no link or prog match, this is     as expected, and it's not a bug. So here just skip the no match situation. (CVE-2022-49970)

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

ID	Name	Product	Family	Severity
309023	Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: kernel (UTSA-2026-011011)	Nessus	Unity Linux Local Security Checks	high
308327	Unity Linux 20.1050a / 20.1060a / 20.1070a Security Update: kernel (UTSA-2026-006899)	Nessus	Unity Linux Local Security Checks	high
301628	EulerOS 2.0 SP13 : kernel (EulerOS-SA-2026-1280)	Nessus	Huawei Local Security Checks	high
301595	EulerOS 2.0 SP13 : kernel (EulerOS-SA-2026-1244)	Nessus	Huawei Local Security Checks	high
244696	Linux Distros Unpatched Vulnerability : CVE-2022-49970	Nessus	Misc.	high

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