In the Linux kernel, the following vulnerability has been resolved:
netfilter: ctnetlink: zero expect NAT fields when CTA_EXPECT_NAT absent
ctnetlink_alloc_expect() allocates expectations from a non-zeroing
slab cache via nf_ct_expect_alloc(). When CTA_EXPECT_NAT is not
present in the netlink message, saved_addr and saved_proto are
never initialized. Stale data from a previous slab occupant can
then be dumped to userspace by ctnetlink_exp_dump_expect(), which
checks these fields to decide whether to emit CTA_EXPECT_NAT.
The safe sibling nf_ct_expect_init(), used by the packet path,
explicitly zeroes these fields.
Zero saved_addr, saved_proto and dir in the else branch, guarded
by IS_ENABLED(CONFIG_NF_NAT) since these fields only exist when
NAT is enabled.
Confirmed by priming the expect slab with NAT-bearing expectations,
freeing them, creating a new expectation without CTA_EXPECT_NAT,
and observing that the ctnetlink dump emits a spurious
CTA_EXPECT_NAT containing stale data from the prior allocation.
References
Configurations
Configuration 1 (hide)
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History
08 May 2026, 18:21
| Type | Values Removed | Values Added |
|---|---|---|
| CPE | cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* |
|
| References | () https://git.kernel.org/stable/c/1c2ebdeff8d088a2e47ae25d7b38447249adace2 - Patch | |
| References | () https://git.kernel.org/stable/c/2898080c054ea4d6ddfaaf21bbedbc229a9a8376 - Patch | |
| References | () https://git.kernel.org/stable/c/35177c6877134a21315f37d57a5577846225623e - Patch | |
| References | () https://git.kernel.org/stable/c/929f7a9a7aad9404a5867216c3f8738232355b38 - Patch | |
| References | () https://git.kernel.org/stable/c/a5a89db6981a1ddf2314bf50cb49db5a3146185f - Patch | |
| References | () https://git.kernel.org/stable/c/a64b7bf84b4d5ea54218c5d374ec87fff9000f43 - Patch | |
| References | () https://git.kernel.org/stable/c/bff0f4f06f12d6d9bc565a3e1378abd4f6f5ce36 - Patch | |
| References | () https://git.kernel.org/stable/c/fd002ff2ea030cbfb0188a11b3c60ce7f84485f4 - Patch | |
| First Time |
Linux linux Kernel
Linux |
|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 5.5 |
| CWE | NVD-CWE-noinfo |
01 May 2026, 15:16
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-05-01 15:16
Updated : 2026-05-08 18:21
NVD link : CVE-2026-43026
Mitre link : CVE-2026-43026
CVE.ORG link : CVE-2026-43026
JSON object : View
Products Affected
linux
- linux_kernel
CWE