CVE catalog

CVE-2026-31531

In the Linux kernel, the following vulnerability has been resolved: ipv4: nexthop: allocate skb dynamically in rtm_get_nexthop() When querying a nexthop object via RTM_GETNEXTHOP, the kernel current

[CVE catalog]

Severity: Medium · CVSS 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Published: Apr 22, 2026, 10:00:00 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.16% · Oct 25, 2026

In the Linux kernel, the following vulnerability has been resolved: ipv4: nexthop: allocate skb dynamically in rtm_get_nexthop() When querying a nexthop object via RTM_GETNEXTHOP, the kernel currently allocates a fixed-size skb using NLMSG_GOODSIZE. While sufficient for single nexthops and small Equal-Cost Multi-Path groups, this fixed allocation fails for large nexthop groups like 512 nexthops. This results in the following warning splat: WARNING: net/ipv4/nexthop.c:3395 at rtm_get_nexthop+0x176/0x1c0, CPU#20: rep/4608 [...] RIP: 0010:rtm_get_nexthop (net/ipv4/nexthop.c:3395) [...] Call Trace: <TASK> rtnetlink_rcv_msg (net/core/rtnetlink.c:6989) netlink_rcv_skb (net/netlink/af_netlink.c:2550) netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344) netlink_sendmsg (net/netlink/af_netlink.c:1894) ____sys_sendmsg (net/socket.c:721 net/socket.c:736 net/socket.c:2585) ___sys_sendmsg (net/socket.c:2641) __sys_sendmsg (net/socket.c:2671) do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) </TASK> Fix this by allocating the size dynamically using nh_nlmsg_size() and using nlmsg_new(), this is consistent with nexthop_notify() behavior. In addition, adjust nh_nlmsg_size_grp() so it calculates the size needed based on flags passed. While at it, also add the size of NHA_FDB for nexthop group size calculation as it was missing too. This cannot be reproduced via iproute2 as the group size is currently limited and the command fails as follows: addattr_l ERROR: message exceeded bound of 1048

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	linux	sid	`7.2.12-1`	fixed
Debian	linux	forky	`7.2.12-1`	fixed
Debian	linux	trixie	`6.12.107-1`	fixed
Debian	linux	trixie-security	`6.12.113-1`	fixed
Debian	linux	bookworm	`6.1.176-1`	vulnerable
Debian	linux	bookworm-security	`6.1.190-1`	vulnerable
Cpe	linux	Not reported	Not reported	vulnerable
Cpe	linux_kernel	Not reported	`6.12.83`	fixed
Cpe	linux_kernel	Not reported	`6.18.24`	fixed
Cpe	linux_kernel	Not reported	`6.19.14`	fixed
Cpe	linux_kernel	Not reported	Not reported	unknown
Cpe	linux_kernel	Not reported	Not reported	unknown

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	linux	source	sid	`6.19.14-1`	not yet assigned	Not reported	Not reported
Debian	linux	source	forky	`6.19.14-1`	not yet assigned	Not reported	Not reported
Debian	linux	source	trixie	`6.12.85-1`	not yet assigned	Not reported	Not reported
Debian	linux	source	bookworm	`(unfixed)`	not yet assigned	Not reported	Not reported
Cpe	linux_kernel	cpe	Not reported	`6.12.83`	Not reported	Not reported	Not reported
Cpe	linux_kernel	cpe	Not reported	`6.18.24`	Not reported	Not reported	Not reported
Cpe	linux_kernel	cpe	Not reported	`6.19.14`	Not reported	Not reported	Not reported

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[bpftool]Affected
Source package: [linux]
Details (6)
- 7.1.0+6.1.176-1 · amd64 · bookworm
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 7.1.0+6.1.176-1 · arm64 · bookworm
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 7.5.0+6.12.95-1~bpo12+1 · amd64 · bookworm-backports
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 7.5.0+6.12.95-1~bpo12+1 · arm64 · bookworm-backports
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 7.1.0+6.1.180-1 · amd64 · bookworm-security
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 7.1.0+6.1.180-1 · arm64 · bookworm-security
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
[hyperv-daemons]Affected
Source package: [linux]
Details (6)
- 6.1.176-1 · amd64 · bookworm
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.1.176-1 · arm64 · bookworm
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.12.95-1~bpo12+1 · amd64 · bookworm-backports
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.12.95-1~bpo12+1 · arm64 · bookworm-backports
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.1.180-1 · amd64 · bookworm-security
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.1.180-1 · arm64 · bookworm-security
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
[intel-sdsi]Affected
Source package: [linux]
Details (1)
- 6.12.95-1~bpo12+1 · amd64 · bookworm-backports
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
[libcpupower1]Affected
Source package: [linux]
Details (6)
- 6.1.176-1 · amd64 · bookworm
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.1.176-1 · arm64 · bookworm
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.12.95-1~bpo12+1 · amd64 · bookworm-backports
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.12.95-1~bpo12+1 · arm64 · bookworm-backports
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.1.180-1 · amd64 · bookworm-security
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.1.180-1 · arm64 · bookworm-security
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
[libcpupower-dev]Affected
Source package: [linux]
Details (6)
- 6.1.176-1 · amd64 · bookworm
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.1.176-1 · arm64 · bookworm
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.12.95-1~bpo12+1 · amd64 · bookworm-backports
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.12.95-1~bpo12+1 · arm64 · bookworm-backports
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.1.180-1 · amd64 · bookworm-security
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.1.180-1 · arm64 · bookworm-security
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
[linux-bpf-dev]Affected
Source package: [linux]
Details (2)
- 6.12.95-1~bpo12+1 · amd64 · bookworm-backports
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.12.95-1~bpo12+1 · arm64 · bookworm-backports
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
[linux-compiler-gcc-12-x86]Affected
Source package: [linux]
Details (2)
- 6.1.176-1 · amd64 · bookworm
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.1.180-1 · amd64 · bookworm-security
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
[linux-config-6.1]Affected
Source package: [linux]
Details (4)
- 6.1.176-1 · amd64 · bookworm
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.1.176-1 · arm64 · bookworm
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.1.180-1 · amd64 · bookworm-security
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.1.180-1 · arm64 · bookworm-security
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
[linux-cpupower]Affected
Source package: [linux]
Details (6)
- 6.1.176-1 · amd64 · bookworm
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.1.176-1 · arm64 · bookworm
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.12.95-1~bpo12+1 · amd64 · bookworm-backports
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.12.95-1~bpo12+1 · arm64 · bookworm-backports
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.1.180-1 · amd64 · bookworm-security
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.1.180-1 · arm64 · bookworm-security
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
[linux-doc]Affected
Source package: [linux]
Details (32)
- 6.1.170-3 · all · bookworm
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.1.170-3 · all · bookworm
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.1.176-1 · all · bookworm
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.1.176-1 · all · bookworm
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.12.43-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.12.43-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.12.57-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.12.57-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.12.63-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.12.63-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.12.69-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.12.69-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.12.73-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.12.73-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.12.74-2~bpo12+1 · all · bookworm-backports
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.12.74-2~bpo12+1 · all · bookworm-backports
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.12.85-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.12.85-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.12.86-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.12.86-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.12.88-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.12.88-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.12.90-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.12.90-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.12.90-2~bpo12+1 · all · bookworm-backports
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.12.90-2~bpo12+1 · all · bookworm-backports
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.12.94-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.12.94-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.12.95-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.12.95-1~bpo12+1 · all · bookworm-backports
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.1.180-1 · all · bookworm-security
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.1.180-1 · all · bookworm-security
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
[linux-doc-6.1]Affected
Source package: [linux]
Details (6)
- 6.1.170-3 · all · bookworm
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.1.170-3 · all · bookworm
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.1.176-1 · all · bookworm
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.1.176-1 · all · bookworm
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.1.180-1 · all · bookworm-security
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.1.180-1 · all · bookworm-security
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
[linux-headers-6.1.0-47-amd64]Affected
Source package: [linux]
Details (1)
- 6.1.170-3 · amd64 · bookworm
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
[linux-headers-6.1.0-47-arm64]Affected
Source package: [linux]
Details (1)
- 6.1.170-3 · arm64 · bookworm
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
[linux-headers-6.1.0-47-cloud-amd64]Affected
Source package: [linux]
Details (1)
- 6.1.170-3 · amd64 · bookworm
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
[linux-headers-6.1.0-47-cloud-arm64]Affected
Source package: [linux]
Details (1)
- 6.1.170-3 · arm64 · bookworm
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
[linux-headers-6.1.0-47-common]Affected
Source package: [linux]
Details (2)
- 6.1.170-3 · all · bookworm
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.1.170-3 · all · bookworm
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
[linux-headers-6.1.0-47-common-rt]Affected
Source package: [linux]
Details (2)
- 6.1.170-3 · all · bookworm
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
- 6.1.170-3 · all · bookworm
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
[linux-headers-6.1.0-47-rt-amd64]Affected
Source package: [linux]
Details (1)
- 6.1.170-3 · amd64 · bookworm
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
[linux-headers-6.1.0-47-rt-arm64]Affected
Source package: [linux]
Details (1)
- 6.1.170-3 · arm64 · bookworm
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12
[linux-headers-6.1.0-50-amd64]Affected
Source package: [linux]
Details (1)
- 6.1.176-1 · amd64 · bookworm
  Affected
  nvd · linux · debian · bookworm; nvd · linux · debian · 12

Next results

Observed: Oct 27, 2026, 7:57:52 AM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]