CVE-2026-89555Critical· 9.8▾ MidnightIn the Linux kernel, the following vulnerability has been resolved: mpls: reload header after pskb_may_pull() mpls_select_multipath() calls mpls_multipath_hash() to choose a nexthop when an MPLS route has multiple nexthops. While walk…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 53.9 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
— → 5.9
none → medium
— → 9.8
none → critical
9.8 → 5.9
critical → medium
0.2% → 0.7%
Last analysed / modified upstream
In the Linux kernel, the following vulnerability has been resolved:
mpls: reload header after pskb_may_pull()
mpls_select_multipath() calls mpls_multipath_hash() to choose a nexthop when an MPLS route has multiple nexthops. While walking the MPLS label stack, the hash routine caches hdr for the current label. After finding the bottom-of-stack label, it calls pskb_may_pull() before reading the inner IP header.
If an skb is constructed with the inner IP header in nonlinear data and insufficient tailroom in the linear head, pskb_may_pull() calls pskb_expand_head() to replace the skb head and free the old one. This leaves hdr pointing to freed memory. The IPv6 path can invalidate hdr again when it performs a second pull for the larger header.
The issue was found through static analysis. A reproducer sending a legal Geneve packet through a bareudp/MPLS multipath setup triggered the same KASAN report in 2 of 2 unpatched runs:
BUG: KASAN: slab-use-after-free in mpls_select_multipath Read of size 1 at addr ffff88800ecc6e20 by task ksoftirqd/1/23
Call Trace: mpls_select_multipath mpls_forward __netif_receive_skb_list_core netif_receive_skb_list_internal napi_complete_done gro_cell_poll __napi_poll net_rx_action
Freed by task 23: kfree pskb_expand_head __pskb_pull_tail mpls_select_multipath
Reload hdr from the current skb head after each successful pull before deriving the inner IPv4 or IPv6 header pointer.
Linux >= 9f427a0e474a67b454420c131709600d44850486 < aa4fe0b450a461aa1162fe8375f5d28f4c957df8Linux >= 9f427a0e474a67b454420c131709600d44850486 < b1c0783b2facc398437ad8f8b86c636d7a78f8dbLinux >= 9f427a0e474a67b454420c131709600d44850486 < bfaaff99238326166694354a63a76c02563f98b1Linux >= 9f427a0e474a67b454420c131709600d44850486 < d9640239827d6d0cb84263b590f7a4f1596c17ebLinux >= 9f427a0e474a67b454420c131709600d44850486 < fed638a248116b8a249bd4202d28e5934bdc65adLinux >= 9f427a0e474a67b454420c131709600d44850486 < d82b90a38c2ca8a0694428eab0e9551c23f2447dLinux >= 9f427a0e474a67b454420c131709600d44850486 < 49d38c1b4390412f8950d33dfaee0ccbd17beb81Linux >= 9f427a0e474a67b454420c131709600d44850486 < 29e63b8d9fc150cc191b1c6eb7e16e1247e1b650Linux ad864d9fce0ec56cc8f6afe5c6a0e6d7f484b9ebLinux >= 4.9.8 < 4.10Linux 4.10Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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