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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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
Last analysed / modified upstream
9.8 → 5.9
critical → medium
0.2% → 0.7%
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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