netfilter: x_tables: restrict xt_check_match/xt_check_target extensions for NFPROTO_ARP
In the Linux kernel, the following vulnerability has been resolved: netfilter: x_tables: restrict xt_check_match/xt_check_target extensions for NFPROTO_ARP Weiming Shi says: xt_match and xt_target structs registered with NFPROTO_UNSPEC can be loaded by any protocol family through nft_compat. When such a match/target sets .hooks to restrict which hooks it may run on, the bitmask uses NF_INET_* constants. This is only correct for families whose hook layout matches NF_INET_*: IPv4, IPv6, INET, and bridge all share the same five hooks (PRE_ROUTING ... POST_ROUTING). ARP only has three hooks (IN=0, OUT=1, FORWARD=2) with different semantics. Because NF_ARP_OUT == 1 == NF_INET_LOCAL_IN, the .hooks validation silently passes for the wrong reasons, allowing matches to run on ARP chains where the hook assumptions (e.g. state->in being set on input hooks) do not hold. This leads to NULL pointer dereferences; xt_devgroup is one concrete example: Oops: general protection fault, probably for non-canonical address 0xdffffc0000000044: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000220-0x0000000000000227] RIP: 0010:devgroup_mt+0xff/0x350 Call Trace: nft_match_eval (net/netfilter/nft_compat.c:407) nft_do_chain (net/netfilter/nf_tables_core.c:285) nft_do_chain_arp (net/netfilter/nft_chain_filter.c:61) nf_hook_slow (net/netfilter/core.c:623) arp_xmit (net/ipv4/arp.c:666) Kernel panic - not syncing: Fatal exception in interrupt Fix it by restricting arptables to NFPROTO
CVE-2026-31424
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-31424
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "9291747f118d6404e509747b85ff5f6dfec368d2",
"lessThan": "80e3c75f71c3ea1e62fcb032382de13e00a68f8b",
"versionType": "git"
},
{
"status": "affected",
"version": "9291747f118d6404e509747b85ff5f6dfec368d2",
"lessThan": "d9a0af9e43416aa50c0595e15fa01365a1c72c49",
"versionType": "git"
},
{
"status": "affected",
"version": "9291747f118d6404e509747b85ff5f6dfec368d2",
"lessThan": "1cd6313c8644bfebbd813a05da9daa21b09dd68c",
"versionType": "git"
},
{
"status": "affected",
"version": "9291747f118d6404e509747b85ff5f6dfec368d2",
"lessThan": "f00ac65c90ea475719e08d629e2e26c8b4e6999b",
"versionType": "git"
},
{
"status": "affected",
"version": "9291747f118d6404e509747b85ff5f6dfec368d2",
"lessThan": "e7e1b6bcb389c8708003d40613a59ff2496f6b1f",
"versionType": "git"
},
{
"status": "affected",
"version": "9291747f118d6404e509747b85ff5f6dfec368d2",
"lessThan": "dc3e27dd7d76e21106b8f9bbdc31f5da74a89014",
"versionType": "git"
},
{
"status": "affected",
"version": "9291747f118d6404e509747b85ff5f6dfec368d2",
"lessThan": "3e79374b03bf9a2f282f0eb1d0ac3776f7e0f28a",
"versionType": "git"
},
{
"status": "affected",
"version": "9291747f118d6404e509747b85ff5f6dfec368d2",
"lessThan": "3d5d488f11776738deab9da336038add95d342d1",
"versionType": "git"
}
],
"programFiles": [
"net/netfilter/x_tables.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.39"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.39",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.253",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.203",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.168",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.134",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.81",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.22",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.12",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/netfilter/x_tables.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-31424
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #28277 · Revision 1
- Added to Heist Feed
- Publisher date