mpls: fix NULL deref in mpls_valid_fib_dump_req() on CONFIG_INET=n
Summary
| CVE | CVE-2026-64569 |
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| State | PUBLISHED |
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| Assigner | Linux |
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| Source Priority | CVE Program / NVD first with legacy fallback |
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| Published | 2026-08-05 08:16:36 UTC |
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| Updated | 2026-08-05 08:16:36 UTC |
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| Description | In 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. |
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Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|
| 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 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-rc4 * original_commit_for_fix |
Not specified |
References
| Reference | Source | Link | Tags |
|---|
| git.kernel.org/stable/c/56d96fededd61192cd7cc8d2b0f36adfd59036c3 |
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 |
|
| CVE Program record |
CVE.ORG |
www.cve.org |
canonical |
| NVD vulnerability detail |
NVD |
nvd.nist.gov |
canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.