mpls: fix NULL deref in mpls_valid_fib_dump_req() on CONFIG_INET=n

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64569
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-05 08:16:36 UTC
Updated2026-08-19 17:20:16 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: mpls: fix NULL deref in mpls_valid_fib_dump_req() on CONFIG_INET=n On CONFIG_INET=n builds, mpls_valid_fib_dump_req() walks the parsed attribute table itself instead of calling ip_valid_fib_dump_req(). The RTA_OIF arm passes tb[RTA_OIF] to nla_get_u32() without checking it is present, so an RTM_GETROUTE dump for AF_MPLS with strict checking and no RTA_OIF hits a NULL dereference. RTM_GETROUTE is RTNL_KIND_GET, which rtnetlink_rcv_msg() permits without CAP_NET_ADMIN, so an unprivileged user can trigger it. Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: 0010:mpls_valid_fib_dump_req (net/mpls/af_mpls.c:2189) Call Trace: mpls_dump_routes (net/mpls/af_mpls.c:2236) netlink_dump (net/netlink/af_netlink.c:2331) __netlink_dump_start (net/netlink/af_netlink.c:2446) rtnetlink_rcv_msg (net/core/rtnetlink.c:7033) netlink_rcv_skb (net/netlink/af_netlink.c:2556) netlink_unicast (net/netlink/af_netlink.c:1345) netlink_sendmsg (net/netlink/af_netlink.c:1900) __sock_sendmsg (net/socket.c:790) ____sys_sendmsg (net/socket.c:2684) ___sys_sendmsg (net/socket.c:2738) __sys_sendmsg (net/socket.c:2770) do_syscall_64 (arch/x86/entry/syscall_64.c:94) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121) Skip unset attributes, as ip_valid_fib_dump_req() does.

Risk And Classification

EPSS: 0.001560000 probability, percentile 0.053290000 (date 2026-08-19)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 196cfebf897266c3450519e916bab9daff74e52c bfc1cb5d6a8308e493e307f1c823d2107abc0a47 git Not specified
CNA Linux Linux affected 196cfebf897266c3450519e916bab9daff74e52c 03b5a2c29afc8e634924c75d6ee94140e70de88d git Not specified
CNA Linux Linux affected 196cfebf897266c3450519e916bab9daff74e52c e796ce9ef4356dc7cbbaa8373843f77852f2814d git Not specified
CNA Linux Linux affected 196cfebf897266c3450519e916bab9daff74e52c d6eee7cd078aaf9dd75efc801f6c9b608a37cd71 git Not specified
CNA Linux Linux affected 196cfebf897266c3450519e916bab9daff74e52c ad6284ced6a15e4abd57ca4d0793b7bd15ca52ce git Not specified
CNA Linux Linux affected 196cfebf897266c3450519e916bab9daff74e52c 5f6e7b32bd1fbde10fd31a4143260735ea535b8a git Not specified
CNA Linux Linux affected 196cfebf897266c3450519e916bab9daff74e52c 06db79411a280707c7e4bf4b221ff4e664b51502 git Not specified
CNA Linux Linux affected 196cfebf897266c3450519e916bab9daff74e52c 56d96fededd61192cd7cc8d2b0f36adfd59036c3 git Not specified
CNA Linux Linux affected 4.20 Not specified
CNA Linux Linux unaffected 4.20 semver Not specified
CNA Linux Linux unaffected 5.10.265 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.216 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.183 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.148 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.101 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.42 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.6 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/03b5a2c29afc8e634924c75d6ee94140e70de88d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/56d96fededd61192cd7cc8d2b0f36adfd59036c3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bfc1cb5d6a8308e493e307f1c823d2107abc0a47 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e796ce9ef4356dc7cbbaa8373843f77852f2814d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/06db79411a280707c7e4bf4b221ff4e664b51502 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ad6284ced6a15e4abd57ca4d0793b7bd15ca52ce 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d6eee7cd078aaf9dd75efc801f6c9b608a37cd71 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5f6e7b32bd1fbde10fd31a4143260735ea535b8a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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