CVE-2026-43452netfilter: x_tables: guard option walkers against 1-byte tail reads
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: netfilter: x_tables: guard option walkers against 1-byte tail reads When the last byte of options is a non-single-byte option kind, walkers that advance with i += op[i + 1] ? : 1 can read op[i + 1] past the end of the option area. Add an explicit i == optlen - 1 check before dereferencing op[i + 1] in xt_tcpudp and xt_dccp option walkers.
- CVSS
- 8.2 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 2e4e6a17af35be359cc8f1c924f8f198fbd478cc before c2a445367a496a3c25dbc940c10c8bd1cfd4c14a; from 2e4e6a17af35be359cc8f1c924f8f198fbd478cc before ae1e1267650638136b84c23f2b31250f0ccb6823; from 2e4e6a17af35be359cc8f1c924f8f198fbd478cc before c39f84e4be1be63fc60ca7141ea7b76edcea5907; from 2e4e6a17af35be359cc8f1c924f8f198fbd478cc before 9b94f0e42ed248eb31929da84ed9f5310d7ff540; from 2e4e6a17af35be359cc8f1c924f8f198fbd478cc before 5b18b8b35c7cded2d17b2b2604c9b0694ff48d1c; from 2e4e6a17af35be359cc8f1c924f8f198fbd478cc before bc18551c6169eac5ed813778d3e3e484002dbbe5; from 2e4e6a17af35be359cc8f1c924f8f198fbd478cc before d04800323336eebf441d153f43234eac9b833d36; from 2e4e6a17af35be359cc8f1c924f8f198fbd478cc before cfe770220ac2dbd3e104c6b45094037455da81d4 | CNA record |
linux linux_kernel linux:linux_kernel | from 2.6.16 before 5.10.253; from 5.11 before 5.15.203; from 5.16 before 6.1.167; from 6.2 before 6.6.130; from 6.7 before 6.12.78; from 6.13 before 6.18.19; from 6.19 before 6.19.9; 7.0; and 2 more ranges | NVD |
References
- https://git.kernel.org/stable/c/c2a445367a496a3c25dbc940c10c8bd1cfd4c14apatch
- https://git.kernel.org/stable/c/ae1e1267650638136b84c23f2b31250f0ccb6823patch
- https://git.kernel.org/stable/c/c39f84e4be1be63fc60ca7141ea7b76edcea5907patch
- https://git.kernel.org/stable/c/9b94f0e42ed248eb31929da84ed9f5310d7ff540patch
- https://git.kernel.org/stable/c/5b18b8b35c7cded2d17b2b2604c9b0694ff48d1cpatch
- https://git.kernel.org/stable/c/bc18551c6169eac5ed813778d3e3e484002dbbe5patch
- https://git.kernel.org/stable/c/d04800323336eebf441d153f43234eac9b833d36patch
- https://git.kernel.org/stable/c/cfe770220ac2dbd3e104c6b45094037455da81d4patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.