| Reporter | Title | Published | Views | Family All 12 |
|---|---|---|---|---|
| Linux kernel 安全漏洞 | 27 May 202600:00 | – | cnnvd | |
| CVE-2026-45933 | 27 May 202612:17 | – | cve | |
| CVE-2026-45933 bpf: Preserve id of register in sync_linked_regs() | 27 May 202612:17 | – | cvelist | |
| CVE-2026-45933 | 27 May 202612:17 | – | debiancve | |
| EUVD-2026-32217 | 27 May 202615:33 | – | euvd | |
| CVE-2026-45933 | 27 May 202614:17 | – | nvd | |
| BELL-CVE-2026-45933 | 28 May 202606:10 | – | osv | |
| DEBIAN-CVE-2026-45933 | 27 May 202614:17 | – | osv | |
| PT-2026-43800 | 27 May 202600:00 | – | ptsecurity | |
| CVE-2026-45933 | 28 May 202600:42 | – | redhatcve |
#%NASL_MIN_LEVEL 80900
##
# (C) Tenable, Inc.
##
include('compat.inc');
if (description)
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script_id(317681);
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script_name(english:"Linux Distros Unpatched Vulnerability : CVE-2026-45933");
script_set_attribute(attribute:"synopsis", value:
"The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be
patched.");
script_set_attribute(attribute:"description", value:
"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: Preserve id of register in
sync_linked_regs() sync_linked_regs() copies the id of known_reg to reg when propagating bounds of
known_reg to reg using the off of known_reg, but when known_reg was linked to reg like: known_reg = reg ;
both known_reg and reg get same id known_reg += 4 ; known_reg gets off = 4, and its id gets BPF_ADD_CONST
now when a call to sync_linked_regs() happens, let's say with the following: if known_reg >= 10 goto pc+2
known_reg's new bounds are propagated to reg but now reg gets BPF_ADD_CONST from the copy. This means if
another link to reg is created like: another_reg = reg ; another_reg should get the id of reg but
assign_scalar_id_before_mov() sees BPF_ADD_CONST on reg and assigns a new id to it. As reg has a new id
now, known_reg's link to reg is broken. If we find new bounds for known_reg, they will not be propagated
to reg. This can be seen in the selftest added in the next commit: 0: (85) call bpf_get_prandom_u32#7 ;
R0=scalar() 1: (57) r0 &= 255 ; R0=scalar(smin=smin32=0,smax=umax=smax32=umax32=255,var_off=(0x0; 0xff))
2: (bf) r1 = r0 ; R0=scalar(id=1,smin=smin32=0,smax=umax=smax32=umax32=255,var_off=(0x0; 0xff))
R1=scalar(id=1,smin=smin32=0,smax=umax=smax32=umax32=255,var_off=(0x0; 0xff)) 3: (07) r1 += 4 ;
R1=scalar(id=1+4,smin=umin=smin32=umin32=4,smax=umax=smax32=umax32=259,var_off=(0x0; 0x1ff)) 4: (a5) if r1
< 0xa goto pc+4 ; R1=scalar(id=1+4,smin=umin=smin32=umin32=10,smax=umax=smax32=umax32=259,var_off=(0x0;
0x1ff)) 5: (bf) r2 = r0 ; R0=scalar(id=2,smin=umin=smin32=umin32=6,smax=umax=smax32=umax32=255)
R2=scalar(id=2,smin=umin=smin32=umin32=6,smax=umax=smax32=umax32=255) 6: (a5) if r1 < 0xe goto pc+2 ;
R1=scalar(id=1+4,smin=umin=smin32=umin32=14,smax=umax=smax32=umax32=259,var_off=(0x0; 0x1ff)) 7: (35) if
r0 >= 0xa goto pc+1 ; R0=scalar(id=2,smin=umin=smin32=umin32=6,smax=umax=smax32=umax32=9,var_off=(0x0;
0xf)) 8: (37) r0 /= 0 div by zero When 4 is verified, r1's bounds are propagated to r0 but r0 also gets
BPF_ADD_CONST (bug). When 5 is verified, r0 gets a new id (2) and its link with r1 is broken. After 6 we
know r1 has bounds [14, 259] and therefore r0 should have bounds [10, 255], therefore the branch at 7 is
always taken. But because r0's id was changed to 2, r1's new bounds are not propagated to r0. The verifier
still thinks r0 has bounds [6, 255] before 7 and execution can reach div by zero. Fix this by preserving
id in sync_linked_regs() like off and subreg_def. (CVE-2026-45933)
Note that Nessus relies on the presence of the package as reported by the vendor.");
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{"reference": "kernel-rt-64k-debug-core"},
{"reference": "kernel-rt-64k-debug-devel"},
{"reference": "kernel-rt-64k-debug-devel-matched"},
{"reference": "kernel-rt-64k-debug-kvm"},
{"reference": "kernel-rt-64k-debug-modules"},
{"reference": "kernel-rt-64k-debug-modules-core"},
{"reference": "kernel-rt-64k-debug-modules-extra"},
{"reference": "kernel-rt-64k-debug-modules-internal"},
{"reference": "kernel-rt-64k-debug-modules-partner"},
{"reference": "kernel-rt-64k-devel"},
{"reference": "kernel-rt-64k-devel-matched"},
{"reference": "kernel-rt-64k-kvm"},
{"reference": "kernel-rt-64k-modules"},
{"reference": "kernel-rt-64k-modules-core"},
{"reference": "kernel-rt-64k-modules-extra"},
{"reference": "kernel-rt-64k-modules-internal"},
{"reference": "kernel-rt-64k-modules-partner"},
{"reference": "kernel-rt-core"},
{"reference": "kernel-rt-debug"},
{"reference": "kernel-rt-debug-core"},
{"reference": "kernel-rt-debug-devel"},
{"reference": "kernel-rt-debug-devel-matched"},
{"reference": "kernel-rt-debug-kvm"},
{"reference": "kernel-rt-debug-modules"},
{"reference": "kernel-rt-debug-modules-core"},
{"reference": "kernel-rt-debug-modules-extra"},
{"reference": "kernel-rt-debug-modules-internal"},
{"reference": "kernel-rt-debug-modules-partner"},
{"reference": "kernel-rt-devel"},
{"reference": "kernel-rt-devel-matched"},
{"reference": "kernel-rt-kvm"},
{"reference": "kernel-rt-modules"},
{"reference": "kernel-rt-modules-core"},
{"reference": "kernel-rt-modules-extra"},
{"reference": "kernel-rt-modules-internal"},
{"reference": "kernel-rt-modules-partner"},
{"reference": "kernel-rt-selftests-internal"},
{"reference": "kernel-selftests-internal"},
{"reference": "kernel-tools"},
{"reference": "kernel-tools-libs"},
{"reference": "kernel-tools-libs-devel"},
{"reference": "kernel-uki-virt"},
{"reference": "kernel-uki-virt-addons"},
{"reference": "kernel-zfcpdump"},
{"reference": "kernel-zfcpdump-core"},
{"reference": "kernel-zfcpdump-devel"},
{"reference": "kernel-zfcpdump-devel-matched"},
{"reference": "kernel-zfcpdump-modules"},
{"reference": "kernel-zfcpdump-modules-core"},
{"reference": "kernel-zfcpdump-modules-extra"},
{"reference": "kernel-zfcpdump-modules-internal"},
{"reference": "kernel-zfcpdump-modules-partner"},
{"reference": "libperf"},
{"reference": "libperf-devel"},
{"reference": "perf"},
{"reference": "python3-perf"},
{"reference": "rtla"},
{"reference": "rv"}
]
}
]
}
};
var distro_constraints_values = linux_unpatched::get_distro_constraints(distro_constraints_arr:distro_constraints_array);
if (empty_or_null(distro_constraints_values)) audit(AUDIT_HOST_NOT, 'affected');
var report = linux_unpatched::check_unpatched_constraints(distro_constraints_values:distro_constraints_values);
if (!empty_or_null(report))
{
security_report_v4(
port : 0,
severity : SECURITY_WARNING,
extra : report
);
exit(0);
}
else
{
audit(AUDIT_HOST_NOT, 'affected');
}
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