Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 076a0ca02644657b13e4af363f487ced2942e9cb before a5a89db6981a1ddf2314bf50cb49db5a3146185f; affected 076a0ca02644657b13e4af363f487ced2942e9cb before 1c2ebdeff8d088a2e47ae25d7b38447249adace2; affected 076a0ca02644657b13e4af363f487ced2942e9cb before a64b7bf84b4d5ea54218c5d374ec87fff9000f43; affected 076a0ca02644657b13e4af363f487ced2942e9cb before 2898080c054ea4d6ddfaaf21bbedbc229a9a8376; affected 076a0ca02644657b13e4af363f487ced2942e9cb before fd002ff2ea030cbfb0188a11b3c60ce7f84485f4; affected 076a0ca02644657b13e4af363f487ced2942e9cb before 929f7a9a7aad9404a5867216c3f8738232355b38; affected 076a0ca02644657b13e4af363f487ced2942e9cb before bff0f4f06f12d6d9bc565a3e1378abd4f6f5ce36; affected 076a0ca02644657b13e4af363f487ced2942e9cb before 35177c6877134a21315f37d57a5577846225623e |
| Linux / Linux | affected 3.4; unaffected 0 before 3.4; unaffected 5.10.253 through 5.10.*; unaffected 5.15.203 through 5.15.*; unaffected 6.1.168 through 6.1.*; unaffected 6.6.134 through 6.6.*; unaffected 6.12.81 through 6.12.*; unaffected 6.18.22 through 6.18.*; unaffected 6.19.12 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/a5a89db6981a1ddf2314bf50cb49db5a3146185f
- https://git.kernel.org/stable/c/1c2ebdeff8d088a2e47ae25d7b38447249adace2
- https://git.kernel.org/stable/c/a64b7bf84b4d5ea54218c5d374ec87fff9000f43
- https://git.kernel.org/stable/c/2898080c054ea4d6ddfaaf21bbedbc229a9a8376
- https://git.kernel.org/stable/c/fd002ff2ea030cbfb0188a11b3c60ce7f84485f4
- https://git.kernel.org/stable/c/929f7a9a7aad9404a5867216c3f8738232355b38
- https://git.kernel.org/stable/c/bff0f4f06f12d6d9bc565a3e1378abd4f6f5ce36
- https://git.kernel.org/stable/c/35177c6877134a21315f37d57a5577846225623e
ADP enrichment
No English description supplied.