CVSS 3.1
Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)
Атакува се
Време до експлоатация
Атакува се локално, без особени условия, без вход и без действие от потребителя.
- Експлоатация: няма данни за експлоатация
- Атаката не може да се автоматизира
Описание
Оригинално описание
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.
Засегнати продукти
- Linux Linux: 2dbcdf33dbf61f44b29adb52338282c3d7840d0e преди 9c0f6894982b1f13bda220707497b25ac9c95bdb; 2dbcdf33dbf61f44b29adb52338282c3d7840d0e преди a13b789497a7fdd27d4d63f5c69d23db706ef0fe; 2dbcdf33dbf61f44b29adb52338282c3d7840d0e преди fa588f28401102652068c4cc75e135507f4b5106; 2dbcdf33dbf61f44b29adb52338282c3d7840d0e преди fcd64d4d97af5d9736f31040f8ed8cd4c17e4c45; 2dbcdf33dbf61f44b29adb52338282c3d7840d0e преди f1516c56ac540da1769f264c3cfefe4499548a5d; 2dbcdf33dbf61f44b29adb52338282c3d7840d0e преди 1e97c404e44991fb087c38ccd7414f2d326f9b74; 2dbcdf33dbf61f44b29adb52338282c3d7840d0e преди ca978f8a93d4d36841839bf2847d29b88c2591d6
- Linux Linux: 4.6; преди 4.6; 5.15.212 до 5.15.*; 6.1.178 до 6.1.*; 6.6.145 до 6.6.*; 6.12.97 до 6.12.*; 6.18.40 до 6.18.*; 7.1.5 до 7.1.*; от 7.2 нататък
Вид слабост
История
- 15 август 2026 Публикувано
Други уязвимости в Linux Linux
Първоизточници
- https://www.cve.org/CVERecord?id=CVE-2026-72085
- https://nvd.nist.gov/vuln/detail/CVE-2026-72085
- https://git.kernel.org/stable/c/9c0f6894982b1f13bda220707497b25ac9c95bdb
- https://git.kernel.org/stable/c/a13b789497a7fdd27d4d63f5c69d23db706ef0fe
- https://git.kernel.org/stable/c/fa588f28401102652068c4cc75e135507f4b5106
- https://git.kernel.org/stable/c/fcd64d4d97af5d9736f31040f8ed8cd4c17e4c45
- https://git.kernel.org/stable/c/f1516c56ac540da1769f264c3cfefe4499548a5d
- https://git.kernel.org/stable/c/1e97c404e44991fb087c38ccd7414f2d326f9b74
- https://git.kernel.org/stable/c/ca978f8a93d4d36841839bf2847d29b88c2591d6