CVE-2026-53218
netfilter: nft_exthdr: fix register tracking for F_PRESENT flag
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_exthdr: fix register tracking for F_PRESENT flag nft_exthdr_init() passes user-controlled priv->len to nft_parse_register_store(), which marks that many bytes in the register bitmap as initialized. However, when NFT_EXTHDR_F_PRESENT is set, the eval paths write only 1 byte (nft_reg_store8) or 4 bytes (*dest = 0 on TCP/DCCP error path). When len > 4, registers beyond the first are never written, retaining uninitialized stack data from nft_regs. Bail out if userspace requests too much data when F_PRESENT is set.
| Vendor | linux |
| Product | linux |
| Ecosystems | |
| Industries | Technology |
| Published | Jun 25, 2026 |
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Affected Versions
Linux / Linux
c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783 < 8738b1b6d0e639ca1fc0f61516afd3557ac4ecc6 c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783 < 19748967d59c31d24d21d40b728570788310b237 c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783 < 46fc15a044e9938e7ea77786fb37edd2cd74f031 c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783 < cd513e43b4b2bd1de39e2367bc4261c699a8652f c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783 < 67b27434c43b68a97becda98c9f0c8cf6cba2134 c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783 < 78069a6d8bc86c9e036eb82c2af4a19cc1871a53 c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783 < f08fb3d42fd3aad0b7a263da3ac3ebaf0845e265 c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783 < 772cecf198da732faebb5dcfc46d66a505be8495
Linux / Linux
4.11
References
git.kernel.org: https://git.kernel.org/stable/c/8738b1b6d0e639ca1fc0f61516afd3557ac4ecc6 git.kernel.org: https://git.kernel.org/stable/c/19748967d59c31d24d21d40b728570788310b237 git.kernel.org: https://git.kernel.org/stable/c/46fc15a044e9938e7ea77786fb37edd2cd74f031 git.kernel.org: https://git.kernel.org/stable/c/cd513e43b4b2bd1de39e2367bc4261c699a8652f git.kernel.org: https://git.kernel.org/stable/c/67b27434c43b68a97becda98c9f0c8cf6cba2134 git.kernel.org: https://git.kernel.org/stable/c/78069a6d8bc86c9e036eb82c2af4a19cc1871a53 git.kernel.org: https://git.kernel.org/stable/c/f08fb3d42fd3aad0b7a263da3ac3ebaf0845e265 git.kernel.org: https://git.kernel.org/stable/c/772cecf198da732faebb5dcfc46d66a505be8495