CVE-2026-72085Critical· 9.3▾ MidnightIn the Linux kernel, the following vulnerability has been resolved: scsi: xen: scsiback: Free unsubmitted command instead of double-putting it scsiback_get_pend_req() obtains a command tag and returns a vscsibk_pend whose embedded se_c…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 51.2 · likelihood 0 · exploitation 0
Need a working PoC? Pro members can cast a request and our team develops one — it lands right here.
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 Oct 16.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
Last analysed / modified upstream
In the Linux kernel, the following vulnerability has been resolved:
scsi: xen: scsiback: Free unsubmitted command instead of double-putting it
scsiback_get_pend_req() obtains a command tag and returns a vscsibk_pend whose embedded se_cmd has only been memset to 0, so its cmd_kref is 0; the se_cmd is initialised (kref_init() via target_init_cmd()) only later, in scsiback_cmd_exec(), on the successful VSCSIIF_ACT_SCSI_CDB path. The two error paths in scsiback_do_cmd_fn() taken before the command is submitted -- a failed scsiback_gnttab_data_map() and an unknown ring_req.act -- call transport_generic_free_cmd(&pending_req->se_cmd, 0), which kref_put()s a refcount of 0. That underflows it ("refcount_t: underflow; use-after-free") and, as the release function is not run, leaks the command tag.
Impact: a pvSCSI guest can leak every command tag of a LUN's session, stopping the LUN, by submitting requests with a bad grant reference or an unknown request type; under panic_on_warn the refcount underflow panics the host.
Add a helper that just returns the tag with target_free_tag() and sends the error response. It frees the tag while the v2p reference still pins the session, and snapshots the response fields beforehand because freeing the tag can let another ring reuse the pending_req slot.
Linux >= 2dbcdf33dbf61f44b29adb52338282c3d7840d0e < 9c0f6894982b1f13bda220707497b25ac9c95bdbLinux >= 2dbcdf33dbf61f44b29adb52338282c3d7840d0e < a13b789497a7fdd27d4d63f5c69d23db706ef0feLinux >= 2dbcdf33dbf61f44b29adb52338282c3d7840d0e < fa588f28401102652068c4cc75e135507f4b5106Linux >= 2dbcdf33dbf61f44b29adb52338282c3d7840d0e < fcd64d4d97af5d9736f31040f8ed8cd4c17e4c45Linux >= 2dbcdf33dbf61f44b29adb52338282c3d7840d0e < f1516c56ac540da1769f264c3cfefe4499548a5dLinux >= 2dbcdf33dbf61f44b29adb52338282c3d7840d0e < 1e97c404e44991fb087c38ccd7414f2d326f9b74Linux >= 2dbcdf33dbf61f44b29adb52338282c3d7840d0e < ca978f8a93d4d36841839bf2847d29b88c2591d6Linux 4.6Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
CVE-2024-38564High· 7.8bpf: Add BPF_PROG_TYPE_CGROUP_SKB attach type enforcement in BPF_LINK_CREATE
CVE-2026-99092Noneriscv: patch: fix handling of bpf-jit execmem addresses
CVE-2026-99089NoneASoC: samsung: i2s: enable op_clk in probe to balance runtime PM
CVE-2026-99093Nonemm: don't schedule deferred kernel page table freeing while booting
CVE-2026-99088Nonenet: openvswitch: validate transport header presence in set_ipv6_addr
CVE-2026-99090Nonedrm/amdgpu: serialize vblank counter reads against GPU reset