NULL Pointer Dereference Affecting kernel-zfcpdump package, versions *
Threat Intelligence
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Test your applications- Snyk IDSNYK-RHEL10-KERNELZFCPDUMP-19927783
- published19 Sept 2026
- disclosed11 Sept 2026
Introduced: 11 Sep 2026
NewCVE-2026-89477 (opens in a new tab)How to fix?
There is no fixed version for RHEL:10 kernel-zfcpdump.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-zfcpdump package and not the kernel-zfcpdump package as distributed by RHEL.
See How to fix? for RHEL:10 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
sctp: fix NULL deref on untransmitted RECONF completion
sctp_process_strreset_outreq(), sctp_process_strreset_addstrm_out() and sctp_process_strreset_resp() complete a pending stream reconfiguration request by stopping the reconf timer on the transport it was sent on:
t = asoc->strreset_chunk->transport;
if (timer_delete(&t->reconf_timer))
sctp_transport_put(t);
chunk->transport is assigned by __sctp_packet_append_chunk() when the chunk is appended to an outbound packet, and sctp_outq_flush_ctrl() arms the reconf timer at that same point. A request already published in asoc->strreset_chunk but not yet transmitted has neither, so completing it dereferences NULL.
Two ways to get there. sctp_send_asconf_del_ip() sets asoc->src_out_of_asoc_ok without sending anything when the address being removed is the association's last one, and sctp_outq_flush_ctrl() then leaves every non-ASCONF control chunk queued; as only sctp_process_asconf_ack() clears that flag, it persists. An unprivileged process that removes such an address and then asks for a stream reset panics the kernel from softirq. A peer needs neither ASCONF nor local help: sctp_cmd_interpreter() uncorks the outqueue only once the whole packet has been processed, so a reply built while walking a RECONF chunk stays untransmitted for the rest of that walk, and one RECONF chunk carrying [Incoming SSN Reset Request, Outgoing SSN Reset Request, Response] -- or two RECONF chunks in one packet -- reaches the same dereference.
KASAN: null-ptr-deref in range [0x00000000000001e8-0x00000000000001ef] RIP: 0010:timer_delete+0x67/0x110 Call Trace: <IRQ> sctp_process_strreset_addstrm_out (net/sctp/stream.c:832) sctp_sf_do_reconf (net/sctp/sm_statefuns.c:4212) sctp_do_sm (net/sctp/sm_sideeffect.c:1172) sctp_assoc_bh_rcv (net/sctp/associola.c:1044) sctp_rcv (net/sctp/input.c:243) ip_local_deliver (net/ipv4/ip_input.c:262) process_backlog (net/core/dev.c:6680) </IRQ>
A response can only acknowledge a request that was actually sent, so do not match asoc->strreset_chunk while chunk->transport is NULL. Guarding the lookup covers all three completion sites.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=2532238
- https://access.redhat.com/security/cve/CVE-2026-89477
- https://git.kernel.org/stable/c/0ee697defc0594f1da810ed75d9d643fb46f5318
- https://git.kernel.org/stable/c/25419f516ea84b1e7d3d55aae5215ac86ece0c66
- https://git.kernel.org/stable/c/2db9bfa3e27bdea15e05ea70b56bad3d21e570ec
- https://git.kernel.org/stable/c/77ea60f2d24002c308f224db44a4542c466489af
- https://git.kernel.org/stable/c/53141db979687eae7dc6d29414cefc77034f967e
- https://git.kernel.org/stable/c/68891125af5a5dfbca728809a16637a869bbe0df
- https://git.kernel.org/stable/c/79ff751311e80fa0370007e46a79a6d601685e75
- https://git.kernel.org/stable/c/b2d6d873b4dfb5b84194061c4b40a1cd85b92ca4