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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: qla2xxx: Fix command flush on cable pull\n\nSystem crash due to command failed to flush back to SCSI layer.\n\n BUG: unable to handle kernel NULL pointer dereference at 0000000000000000\n PGD 0 P4D 0\n Oops: 0000 [#1] SMP NOPTI\n CPU: 27 PID: 793455 Comm: kworker/u130:6 Kdump: loaded Tainted: G           OE    --------- -  - 4.18.0-372.9.1.el8.x86_64 #1\n Hardware name: HPE ProLiant DL360 Gen10/ProLiant DL360 Gen10, BIOS U32 09/03/2021\n Workqueue: nvme-wq nvme_fc_connect_ctrl_work [nvme_fc]\n RIP: 0010:__wake_up_common+0x4c/0x190\n Code: 24 10 4d 85 c9 74 0a 41 f6 01 04 0f 85 9d 00 00 00 48 8b 43 08 48 83 c3 08 4c 8d 48 e8 49 8d 41 18 48 39 c3 0f 84 f0 00 00 00 \u003c49\u003e 8b 41 18 89 54 24 08 31 ed 4c 8d 70 e8 45 8b 29 41 f6 c5 04 75\n RSP: 0018:ffff95f3e0cb7cd0 EFLAGS: 00010086\n RAX: 0000000000000000 RBX: ffff8b08d3b26328 RCX: 0000000000000000\n RDX: 0000000000000001 RSI: 0000000000000003 RDI: ffff8b08d3b26320\n RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffffffffffe8\n R10: 0000000000000000 R11: ffff95f3e0cb7a60 R12: ffff95f3e0cb7d20\n R13: 0000000000000003 R14: 0000000000000000 R15: 0000000000000000\n FS:  0000000000000000(0000) GS:ffff8b2fdf6c0000(0000) knlGS:0000000000000000\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 0000000000000000 CR3: 0000002f1e410002 CR4: 00000000007706e0\n DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n PKRU: 55555554\n Call Trace:\n  __wake_up_common_lock+0x7c/0xc0\n  qla_nvme_ls_req+0x355/0x4c0 [qla2xxx]\n qla2xxx [0000:12:00.1]-f084:3: qlt_free_session_done: se_sess 0000000000000000 / sess ffff8ae1407ca000 from port 21:32:00:02:ac:07:ee:b8 loop_id 0x02 s_id 01:02:00 logout 1 keep 0 els_logo 0\n ? __nvme_fc_send_ls_req+0x260/0x380 [nvme_fc]\n qla2xxx [0000:12:00.1]-207d:3: FCPort 21:32:00:02:ac:07:ee:b8 state transitioned from ONLINE to LOST - portid=010200.\n  ? nvme_fc_send_ls_req.constprop.42+0x1a/0x45 [nvme_fc]\n qla2xxx [0000:12:00.1]-2109:3: qla2x00_schedule_rport_del 21320002ac07eeb8. rport ffff8ae598122000 roles 1\n ? nvme_fc_connect_ctrl_work.cold.63+0x1e3/0xa7d [nvme_fc]\n qla2xxx [0000:12:00.1]-f084:3: qlt_free_session_done: se_sess 0000000000000000 / sess ffff8ae14801e000 from port 21:32:01:02:ad:f7:ee:b8 loop_id 0x04 s_id 01:02:01 logout 1 keep 0 els_logo 0\n  ? __switch_to+0x10c/0x450\n ? process_one_work+0x1a7/0x360\n qla2xxx [0000:12:00.1]-207d:3: FCPort 21:32:01:02:ad:f7:ee:b8 state transitioned from ONLINE to LOST - portid=010201.\n  ? worker_thread+0x1ce/0x390\n  ? create_worker+0x1a0/0x1a0\n qla2xxx [0000:12:00.1]-2109:3: qla2x00_schedule_rport_del 21320102adf7eeb8. rport ffff8ae3b2312800 roles 70\n  ? kthread+0x10a/0x120\n qla2xxx [0000:12:00.1]-2112:3: qla_nvme_unregister_remote_port: unregister remoteport on ffff8ae14801e000 21320102adf7eeb8\n  ? set_kthread_struct+0x40/0x40\n qla2xxx [0000:12:00.1]-2110:3: remoteport_delete of ffff8ae14801e000 21320102adf7eeb8 completed.\n  ? ret_from_fork+0x1f/0x40\n qla2xxx [0000:12:00.1]-f086:3: qlt_free_session_done: waiting for sess ffff8ae14801e000 logout\n\nThe system was under memory stress where driver was not able to allocate an\nSRB to carry out error recovery of cable pull.  The failure to flush causes\nupper layer to start modifying scsi_cmnd.  When the system frees up some\nmemory, the subsequent cable pull trigger another command flush. At this\npoint the driver access a null pointer when attempting to DMA unmap the\nSGL.\n\nAdd a check to make sure commands are flush back on session tear down to\nprevent the null pointer access."
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              "value": "AV:A - The session teardown that triggers the bug is driven by remote Fibre Channel fabric events \u2014 `MBA_PORT_UPDATE` port-logout/RSCN async events from a peer port or switch reach `qlt_schedule_sess_for_deletion()` in initiator mode with no local access required. An FC SAN is a logically adjacent topology / limited administrative domain rather than a routable network, so Adjacent applies.\nAC:L - An attacker on the fabric controls both required conditions: repeated login/logout storms with deep queue depth force many concurrent GFP_ATOMIC abort-SRB allocations against the fixed 128-entry `SRB_MIN_REQ` mempool, making the flush failure reproducible, and the sequence can be retried indefinitely at no cost.\nPR:N - Fibre Channel performs no authentication by default, so a peer port needs no credentials or account on the victim host to force session teardown while I/O is outstanding. The vulnerable path is reached entirely from firmware-delivered link events.\nUI:N - No victim action is needed \u2014 the crash follows automatically from the link/session state change and the subsequent teardown once the flush has failed.\nS:U - The stale-pointer access, memory corruption, and crash are all confined to the host kernel; no security authority or virtualization boundary is crossed.\nC:H - The driver acts on a `scsi_cmnd` the midlayer has already reclaimed and may have reused, and on a freed `fc_port_t` still referenced by outstanding SRBs \u2014 a stale-pointer/UAF-class condition on heap objects whose contents an attacker can shape via I/O patterns, and `scsi_dma_unmap()` on a reused SGL triggers swiotlb copy-back into the wrong pages.\nI:H - The same primitive gives writes: unmapping an in-flight scatter-gather list lets the HBA DMA into pages the kernel has since freed and reallocated, and `qla2x00_sp_compl()` calls `scsi_done()` on a recycled request, corrupting another command\u0027s result and double-completing it in the block layer.\nA:H - The reported failure is a kernel NULL pointer dereference oops while DMA-unmapping the stale command\u0027s SGL, taking down the storage host; the fix additionally has to force a full chip reset to recover."
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nice: Fix crash by keep old cfg when update TCs more than queues\n\nThere are problems if allocated queues less than Traffic Classes.\n\nCommit a632b2a4c920 (\"ice: ethtool: Prohibit improper channel config\nfor DCB\") already disallow setting less queues than TCs.\n\nAnother case is if we first set less queues, and later update more TCs\nconfig due to LLDP, ice_vsi_cfg_tc() will failed but left dirty\nnum_txq/rxq and tc_cfg in vsi, that will cause invalid pointer access.\n\n[   95.968089] ice 0000:3b:00.1: More TCs defined than queues/rings allocated.\n[   95.968092] ice 0000:3b:00.1: Trying to use more Rx queues (8), than were allocated (1)!\n[   95.968093] ice 0000:3b:00.1: Failed to config TC for VSI index: 0\n[   95.969621] general protection fault: 0000 [#1] SMP NOPTI\n[   95.969705] CPU: 1 PID: 58405 Comm: lldpad Kdump: loaded Tainted: G     U  W  O     --------- -t - 4.18.0 #1\n[   95.969867] Hardware name: O.E.M/BC11SPSCB10, BIOS 8.23 12/30/2021\n[   95.969992] RIP: 0010:devm_kmalloc+0xa/0x60\n[   95.970052] Code: 5c ff ff ff 31 c0 5b 5d 41 5c c3 b8 f4 ff ff ff eb f4 0f 1f 40 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 89 d1 \u003c8b\u003e 97 60 02 00 00 48 8d 7e 18 48 39 f7 72 3f 55 89 ce 53 48 8b 4c\n[   95.970344] RSP: 0018:ffffc9003f553888 EFLAGS: 00010206\n[   95.970425] RAX: dead000000000200 RBX: ffffea003c425b00 RCX: 00000000006080c0\n[   95.970536] RDX: 00000000006080c0 RSI: 0000000000000200 RDI: dead000000000200\n[   95.970648] RBP: dead000000000200 R08: 00000000000463c0 R09: ffff888ffa900000\n[   95.970760] R10: 0000000000000000 R11: 0000000000000002 R12: ffff888ff6b40100\n[   95.970870] R13: ffff888ff6a55018 R14: 0000000000000000 R15: ffff888ff6a55460\n[   95.970981] FS:  00007f51b7d24700(0000) GS:ffff88903ee80000(0000) knlGS:0000000000000000\n[   95.971108] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[   95.971197] CR2: 00007fac5410d710 CR3: 0000000f2c1de002 CR4: 00000000007606e0\n[   95.971309] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n[   95.971419] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n[   95.971530] PKRU: 55555554\n[   95.971573] Call Trace:\n[   95.971622]  ice_setup_rx_ring+0x39/0x110 [ice]\n[   95.971695]  ice_vsi_setup_rx_rings+0x54/0x90 [ice]\n[   95.971774]  ice_vsi_open+0x25/0x120 [ice]\n[   95.971843]  ice_open_internal+0xb8/0x1f0 [ice]\n[   95.971919]  ice_ena_vsi+0x4f/0xd0 [ice]\n[   95.971987]  ice_dcb_ena_dis_vsi.constprop.5+0x29/0x90 [ice]\n[   95.972082]  ice_pf_dcb_cfg+0x29a/0x380 [ice]\n[   95.972154]  ice_dcbnl_setets+0x174/0x1b0 [ice]\n[   95.972220]  dcbnl_ieee_set+0x89/0x230\n[   95.972279]  ? dcbnl_ieee_del+0x150/0x150\n[   95.972341]  dcb_doit+0x124/0x1b0\n[   95.972392]  rtnetlink_rcv_msg+0x243/0x2f0\n[   95.972457]  ? dcb_doit+0x14d/0x1b0\n[   95.972510]  ? __kmalloc_node_track_caller+0x1d3/0x280\n[   95.972591]  ? rtnl_calcit.isra.31+0x100/0x100\n[   95.972661]  netlink_rcv_skb+0xcf/0xf0\n[   95.972720]  netlink_unicast+0x16d/0x220\n[   95.972781]  netlink_sendmsg+0x2ba/0x3a0\n[   95.975891]  sock_sendmsg+0x4c/0x50\n[   95.979032]  ___sys_sendmsg+0x2e4/0x300\n[   95.982147]  ? kmem_cache_alloc+0x13e/0x190\n[   95.985242]  ? __wake_up_common_lock+0x79/0x90\n[   95.988338]  ? __check_object_size+0xac/0x1b0\n[   95.991440]  ? _copy_to_user+0x22/0x30\n[   95.994539]  ? move_addr_to_user+0xbb/0xd0\n[   95.997619]  ? __sys_sendmsg+0x53/0x80\n[   96.000664]  __sys_sendmsg+0x53/0x80\n[   96.003747]  do_syscall_64+0x5b/0x1d0\n[   96.006862]  entry_SYSCALL_64_after_hwframe+0x65/0xca\n\nOnly update num_txq/rxq when passed check, and restore tc_cfg if setup\nqueue map failed."
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsched/fair: Prevent dead task groups from regaining cfs_rq\u0027s\n\nKevin is reporting crashes which point to a use-after-free of a cfs_rq\nin update_blocked_averages(). Initial debugging revealed that we\u0027ve\nlive cfs_rq\u0027s (on_list=1) in an about to be kfree()\u0027d task group in\nfree_fair_sched_group(). However, it was unclear how that can happen.\n\nHis kernel config happened to lead to a layout of struct sched_entity\nthat put the \u0027my_q\u0027 member directly into the middle of the object\nwhich makes it incidentally overlap with SLUB\u0027s freelist pointer.\nThat, in combination with SLAB_FREELIST_HARDENED\u0027s freelist pointer\nmangling, leads to a reliable access violation in form of a #GP which\nmade the UAF fail fast.\n\nMichal seems to have run into the same issue[1]. He already correctly\ndiagnosed that commit a7b359fc6a37 (\"sched/fair: Correctly insert\ncfs_rq\u0027s to list on unthrottle\") is causing the preconditions for the\nUAF to happen by re-adding cfs_rq\u0027s also to task groups that have no\nmore running tasks, i.e. also to dead ones. His analysis, however,\nmisses the real root cause and it cannot be seen from the crash\nbacktrace only, as the real offender is tg_unthrottle_up() getting\ncalled via sched_cfs_period_timer() via the timer interrupt at an\ninconvenient time.\n\nWhen unregister_fair_sched_group() unlinks all cfs_rq\u0027s from the dying\ntask group, it doesn\u0027t protect itself from getting interrupted. If the\ntimer interrupt triggers while we iterate over all CPUs or after\nunregister_fair_sched_group() has finished but prior to unlinking the\ntask group, sched_cfs_period_timer() will execute and walk the list of\ntask groups, trying to unthrottle cfs_rq\u0027s, i.e. re-add them to the\ndying task group. These will later -- in free_fair_sched_group() -- be\nkfree()\u0027ed while still being linked, leading to the fireworks Kevin\nand Michal are seeing.\n\nTo fix this race, ensure the dying task group gets unlinked first.\nHowever, simply switching the order of unregistering and unlinking the\ntask group isn\u0027t sufficient, as concurrent RCU walkers might still see\nit, as can be seen below:\n\n    CPU1:                                      CPU2:\n      :                                        timer IRQ:\n      :                                          do_sched_cfs_period_timer():\n      :                                            :\n      :                                            distribute_cfs_runtime():\n      :                                              rcu_read_lock();\n      :                                              :\n      :                                              unthrottle_cfs_rq():\n    sched_offline_group():                             :\n      :                                                walk_tg_tree_from(\u2026,tg_unthrottle_up,\u2026):\n      list_del_rcu(\u0026tg-\u003elist);                           :\n (1)  :                                                  list_for_each_entry_rcu(child, \u0026parent-\u003echildren, siblings)\n      :                                                    :\n (2)  list_del_rcu(\u0026tg-\u003esiblings);                         :\n      :                                                    tg_unthrottle_up():\n      unregister_fair_sched_group():                         struct cfs_rq *cfs_rq = tg-\u003ecfs_rq[cpu_of(rq)];\n        :                                                    :\n        list_del_leaf_cfs_rq(tg-\u003ecfs_rq[cpu]);               :\n        :                                                    :\n        :                                                    if (!cfs_rq_is_decayed(cfs_rq) || cfs_rq-\u003enr_running)\n (3)    :                                                        list_add_leaf_cfs_rq(cfs_rq);\n      :                                                      :\n      :                                                    :\n      :                                                  :\n      :                                                :\n      :                           \n---truncated---"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: lpfc: Fix list_add() corruption in lpfc_drain_txq()\n\nWhen parsing the txq list in lpfc_drain_txq(), the driver attempts to pass\nthe requests to the adapter. If such an attempt fails, a local \"fail_msg\"\nstring is set and a log message output.  The job is then added to a\ncompletions list for cancellation.\n\nProcessing of any further jobs from the txq list continues, but since\n\"fail_msg\" remains set, jobs are added to the completions list regardless\nof whether a wqe was passed to the adapter.  If successfully added to\ntxcmplq, jobs are added to both lists resulting in list corruption.\n\nFix by clearing the fail_msg string after adding a job to the completions\nlist. This stops the subsequent jobs from being added to the completions\nlist unless they had an appropriate failure."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - lpfc_drain_txq drains deferred ELS IOCBs on the Emulex FC HBA ELS ring; an adjacent FC/FCoE SAN fabric peer can induce discovery/ELS congestion that queues and drains those jobs, matching other lpfc adjacent-fabric scores.\nAC:L - A fabric attacker can flood ELS/discovery to exhaust SGLs (building a multi-job txq) and fill the WQ so one submit fails then later jobs succeed in the same drain; the sticky fail_msg bug then fires without relying on an uncontrollable memory layout.\nPR:N - The path runs in HBA/worker context on fabric-driven ELS traffic with no host authentication or capabilities required of the SAN peer.\nUI:N - ELS deferral and txq drain run automatically during fabric discovery and link events; no local user action is required.\nS:U - List corruption and resulting UAF stay inside the host kernel lpfc heap under the same OS authority; no VM escape or IOMMU/DMA boundary is crossed.\nC:H - Successfully submitted iocbqs are wrongly list_add\u0027d onto completions while still on txcmplq, yielding list corruption and UAF of iocbq objects (including via iocbq_lookup on HW completion), enabling reclaim-assisted arbitrary read.\nI:H - Cancel invokes cmd_cmpl on the double-listed iocbq while HW completion still references it, producing a UAF with a callable function pointer suitable for heap grooming and control-flow hijack.\nA:H - Corrupted list walks and the subsequent UAF cause kernel oops/panic (or hangs under list corruption), fully denying host and FC storage-path availability."
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        }
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        "dateUpdated": "2026-08-05T08:46:43.456Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ad4776b5eb2e58af1226847fcd3b4f6d051674dd"
        },
        {
          "url": "https://git.kernel.org/stable/c/ec70d80a8642900086447ba0cdc79e3f44d42e8f"
        },
        {
          "url": "https://git.kernel.org/stable/c/f05a0191b90156e539cccc189b9d87ca2a4d9305"
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        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/814d3610c4ce86e8cf285b2cdac0057a42e82de5"
        },
        {
          "url": "https://git.kernel.org/stable/c/99154581b05c8fb22607afb7c3d66c1bace6aa5d"
        }
      ],
      "title": "scsi: lpfc: Fix list_add() corruption in lpfc_drain_txq()",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47203",
    "datePublished": "2024-04-10T18:56:37.066Z",
    "dateReserved": "2024-03-25T09:12:14.117Z",
    "dateUpdated": "2026-08-05T08:46:43.456Z",
    "state": "PUBLISHED"
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        "dateUpdated": "2023-09-20T17:36:50.978Z",
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        "shortName": "redhat"
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