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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: defensively unhash xfrm_state lists in __xfrm_state_delete\n\nKASAN reproduces a slab-use-after-free in __xfrm_state_delete()\u0027s\nhlist_del_rcu calls under syzkaller load on linux-6.12.y stable\n(reproduced on 6.12.47, also reachable via the same code path on\ntorvalds/master and on the ipsec tree). Nine unique signatures cluster\nin the xfrm_state lifecycle, the load-bearing one being:\n\n  BUG: KASAN: slab-use-after-free in __hlist_del include/linux/list.h:990 [inline]\n  BUG: KASAN: slab-use-after-free in hlist_del_rcu include/linux/rculist.h:516 [inline]\n  BUG: KASAN: slab-use-after-free in __xfrm_state_delete net/xfrm/xfrm_state.c\n  Write of size 8 at addr ffff8881198bcb70 by task kworker/u8:9/435\n\n  Workqueue: netns cleanup_net\n  Call Trace:\n   __hlist_del / hlist_del_rcu\n   __xfrm_state_delete\n   xfrm_state_delete\n   xfrm_state_flush\n   xfrm_state_fini\n   ops_exit_list\n   cleanup_net\n\nThe other observed signatures hit the same slab object from\n__xfrm_state_lookup, xfrm_alloc_spi, __xfrm_state_insert and an OOB\nwrite variant of __xfrm_state_delete, all on the byseq/byspi\nhash chains.\n\n__xfrm_state_delete() guards its byseq and byspi unhashes with\nvalue-based predicates:\n\n\tif (x-\u003ekm.seq)\n\t\thlist_del_rcu(\u0026x-\u003ebyseq);\n\tif (x-\u003eid.spi)\n\t\thlist_del_rcu(\u0026x-\u003ebyspi);\n\nwhile everywhere else in the file (e.g. state_cache, state_cache_input)\nthe safer hlist_unhashed() check is used. xfrm_alloc_spi() sets\nx-\u003eid.spi = newspi inside xfrm_state_lock and then immediately inserts\ninto byspi, but a path that observes x-\u003eid.spi != 0 outside of\nxfrm_state_lock can still skip-or-hit the byspi unhash inconsistently\nwith whether x is actually on the list. The same holds for x-\u003ekm.seq\nversus byseq, and the bydst/bysrc unhashes have no predicate at all,\nso a second __xfrm_state_delete() on the same object writes through\nLIST_POISON pprev.\n\nThe defensive change here:\n\n  - Use hlist_del_init_rcu() instead of hlist_del_rcu() on bydst,\n    bysrc, byseq and byspi so a second deletion is a no-op rather\n    than a write through LIST_POISON pprev. The byseq/byspi nodes\n    are already initialised in xfrm_state_alloc().\n  - Test hlist_unhashed() rather than the value predicate for\n    byseq/byspi, so the unhash decision tracks list state rather than\n    mutable scalar fields.\n\nEmpirical verification: applied this patch on top of v6.12.47, rebuilt,\nand re-ran the same syzkaller harness for 1h16m on a previously-crashy\nconfiguration that produced ~100 hits each of slab-use-after-free\nRead in xfrm_alloc_spi / Read in __xfrm_state_lookup / Write in\n__xfrm_state_delete. After the patch, 7.1M execs across 32 VMs at\n~1550 exec/sec produced zero xfrm_state UAF/OOB hits. /proc/slabinfo\nconfirms the xfrm_state slab is actively allocated and freed during\nthe run (~143 KiB resident), so the fuzzer is still exercising those\ncode paths -- they just no longer crash.\n\nReproduction:\n\n  - Linux 6.12.47 x86_64 + KASAN_GENERIC + KASAN_INLINE + KCOV\n  - syzkaller @ 746545b8b1e4c3a128db8652b340d3df90ce61db\n  - 32 QEMU/KVM VMs x 2 vCPU on AWS c5.metal bare metal\n  - 9 unique signatures collected in ~9h, all within xfrm_state\n    lifecycle"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncrypto: ccp: Don\u0027t attempt to copy CSR to userspace if PSP command failed\n\nWhen retrieving the PEK CSR, don\u0027t attempt to copy the blob to userspace\nif the firmware command failed.  If the failure was due to an invalid\nlength, i.e. the userspace buffer+length was too small, copying the number\nof bytes _firmware_ requires will overflow the kernel-allocated buffer and\nleak data to userspace.\n\n  BUG: KASAN: slab-out-of-bounds in instrument_copy_to_user ../include/linux/instrumented.h:129 [inline]\n  BUG: KASAN: slab-out-of-bounds in _inline_copy_to_user ../include/linux/uaccess.h:205 [inline]\n  BUG: KASAN: slab-out-of-bounds in _copy_to_user+0x66/0xa0 ../lib/usercopy.c:26\n  Read of size 2084 at addr ffff898144612e20 by task syz.9.219/21405\n\n  CPU: 14 UID: 0 PID: 21405 Comm: syz.9.219 Tainted: G     U     O        7.0.0-smp-DEV #28 PREEMPTLAZY\n  Tainted: [U]=USER, [O]=OOT_MODULE\n  Hardware name: Google, Inc. Arcadia_IT_80/Arcadia_IT_80, BIOS 12.62.0-0 11/19/2025\n  Call Trace:\n   \u003cTASK\u003e\n   dump_stack_lvl+0xc5/0x110 ../lib/dump_stack.c:120\n   print_address_description ../mm/kasan/report.c:378 [inline]\n   print_report+0xbc/0x260 ../mm/kasan/report.c:482\n   kasan_report+0xa2/0xe0 ../mm/kasan/report.c:595\n   check_region_inline ../mm/kasan/generic.c:-1 [inline]\n   kasan_check_range+0x264/0x2c0 ../mm/kasan/generic.c:200\n   instrument_copy_to_user ../include/linux/instrumented.h:129 [inline]\n   _inline_copy_to_user ../include/linux/uaccess.h:205 [inline]\n   _copy_to_user+0x66/0xa0 ../lib/usercopy.c:26\n   copy_to_user ../include/linux/uaccess.h:236 [inline]\n   sev_ioctl_do_pek_csr+0x31f/0x590 ../drivers/crypto/ccp/sev-dev.c:1872\n   sev_ioctl+0x3a4/0x490 ../drivers/crypto/ccp/sev-dev.c:2562\n   vfs_ioctl ../fs/ioctl.c:51 [inline]\n   __do_sys_ioctl ../fs/ioctl.c:597 [inline]\n   __se_sys_ioctl+0x11d/0x1b0 ../fs/ioctl.c:583\n   do_syscall_x64 ../arch/x86/entry/syscall_64.c:63 [inline]\n   do_syscall_64+0xe0/0x800 ../arch/x86/entry/syscall_64.c:94\n   entry_SYSCALL_64_after_hwframe+0x76/0x7e\n   \u003c/TASK\u003e\n\nWARN if the driver says the command succeeded, but the firmware error code\nsays otherwise, as __sev_do_cmd_locked() is expected to return -EIO on any\nfirwmware error."
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            "value": "RHSA-2026:33224: Red Hat Enterprise Linux BaseOS (v. 9)"
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            "value": "RHSA-2026:23259: Red Hat Enterprise Linux NFV (v. 8), Red Hat Enterprise Linux RT (v. 8)"
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            "value": "RHSA-2026:26462: Red Hat Enterprise Linux Real Time E4S (v.9.2), Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2)"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbonding: alb: fix UAF in rlb_arp_recv during bond up/down\n\nThe ALB RX path may access rx_hashtbl concurrently with bond\nteardown. During rapid bond up/down cycles, rlb_deinitialize()\nfrees rx_hashtbl while RX handlers are still running, leading\nto a null pointer dereference detected by KASAN.\n\nHowever, the root cause is that rlb_arp_recv() can still be accessed\nafter setting recv_probe to NULL, which is actually a use-after-free\n(UAF) issue. That is the reason for using the referenced commit in the\nFixes tag.\n\n[  214.174138] Oops: general protection fault, probably for non-canonical address 0xdffffc000000001d: 0000 [#1] SMP KASAN PTI\n[  214.186478] KASAN: null-ptr-deref in range [0x00000000000000e8-0x00000000000000ef]\n[  214.194933] CPU: 30 UID: 0 PID: 2375 Comm: ping Kdump: loaded Not tainted 6.19.0-rc8+ #2 PREEMPT(voluntary)\n[  214.205907] Hardware name: Dell Inc. PowerEdge R730/0WCJNT, BIOS 2.14.0 01/14/2022\n[  214.214357] RIP: 0010:rlb_arp_recv+0x505/0xab0 [bonding]\n[  214.220320] Code: 0f 85 2b 05 00 00 48 b8 00 00 00 00 00 fc ff df 40 0f b6 ed 48 c1 e5 06 49 03 ad 78 01 00 00 48 8d 7d 28 48 89 fa 48 c1 ea 03 \u003c0f\u003e b6\n 04 02 84 c0 74 06 0f 8e 12 05 00 00 80 7d 28 00 0f 84 8c 00\n[  214.241280] RSP: 0018:ffffc900073d8870 EFLAGS: 00010206\n[  214.247116] RAX: dffffc0000000000 RBX: ffff888168556822 RCX: ffff88816855681e\n[  214.255082] RDX: 000000000000001d RSI: dffffc0000000000 RDI: 00000000000000e8\n[  214.263048] RBP: 00000000000000c0 R08: 0000000000000002 R09: ffffed11192021c8\n[  214.271013] R10: ffff8888c9010e43 R11: 0000000000000001 R12: 1ffff92000e7b119\n[  214.278978] R13: ffff8888c9010e00 R14: ffff888168556822 R15: ffff888168556810\n[  214.286943] FS:  00007f85d2d9cb80(0000) GS:ffff88886ccb3000(0000) knlGS:0000000000000000\n[  214.295966] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[  214.302380] CR2: 00007f0d047b5e34 CR3: 00000008a1c2e002 CR4: 00000000001726f0\n[  214.310347] Call Trace:\n[  214.313070]  \u003cIRQ\u003e\n[  214.315318]  ? __pfx_rlb_arp_recv+0x10/0x10 [bonding]\n[  214.320975]  bond_handle_frame+0x166/0xb60 [bonding]\n[  214.326537]  ? __pfx_bond_handle_frame+0x10/0x10 [bonding]\n[  214.332680]  __netif_receive_skb_core.constprop.0+0x576/0x2710\n[  214.339199]  ? __pfx_arp_process+0x10/0x10\n[  214.343775]  ? sched_balance_find_src_group+0x98/0x630\n[  214.349513]  ? __pfx___netif_receive_skb_core.constprop.0+0x10/0x10\n[  214.356513]  ? arp_rcv+0x307/0x690\n[  214.360311]  ? __pfx_arp_rcv+0x10/0x10\n[  214.364499]  ? __lock_acquire+0x58c/0xbd0\n[  214.368975]  __netif_receive_skb_one_core+0xae/0x1b0\n[  214.374518]  ? __pfx___netif_receive_skb_one_core+0x10/0x10\n[  214.380743]  ? lock_acquire+0x10b/0x140\n[  214.385026]  process_backlog+0x3f1/0x13a0\n[  214.389502]  ? process_backlog+0x3aa/0x13a0\n[  214.394174]  __napi_poll.constprop.0+0x9f/0x370\n[  214.399233]  net_rx_action+0x8c1/0xe60\n[  214.403423]  ? __pfx_net_rx_action+0x10/0x10\n[  214.408193]  ? lock_acquire.part.0+0xbd/0x260\n[  214.413058]  ? sched_clock_cpu+0x6c/0x540\n[  214.417540]  ? mark_held_locks+0x40/0x70\n[  214.421920]  handle_softirqs+0x1fd/0x860\n[  214.426302]  ? __pfx_handle_softirqs+0x10/0x10\n[  214.431264]  ? __neigh_event_send+0x2d6/0xf50\n[  214.436131]  do_softirq+0xb1/0xf0\n[  214.439830]  \u003c/IRQ\u003e\n\nThe issue is reproducible by repeatedly running\nip link set bond0 up/down while receiving ARP messages, where\nrlb_arp_recv() can race with rlb_deinitialize() and dereference\na freed rx_hashtbl entry.\n\nFix this by setting recv_probe to NULL and then calling\nsynchronize_net() to wait for any concurrent RX processing to finish.\nThis ensures that no RX handler can access rx_hashtbl after it is freed\nin bond_alb_deinitialize()."
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    "dateReserved": "2026-01-13T15:37:45.996Z",
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            "time": "2026-05-23T00:00:00.000Z",
            "value": "Reported to Red Hat."
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            "time": "2026-05-23T00:00:00.000Z",
            "value": "Made public."
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        ],
        "title": "kernel: net: skbuff: propagate shared-frag marker through frag-transfer helpers",
        "workarounds": [
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              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: skbuff: propagate shared-frag marker through frag-transfer helpers\n\nTwo frag-transfer helpers (__pskb_copy_fclone() and skb_shift()) fail\nto propagate the SKBFL_SHARED_FRAG bit in skb_shinfo()-\u003eflags when\nmoving frags from source to destination.  __pskb_copy_fclone() defers\nthe rest of the shinfo metadata to skb_copy_header() after copying\nfrag descriptors, but that helper only carries over gso_{size,segs,\ntype} and never touches skb_shinfo()-\u003eflags; skb_shift() moves frag\ndescriptors directly and leaves flags untouched.  As a result, the\ndestination skb keeps a reference to the same externally-owned or\npage-cache-backed pages while reporting skb_has_shared_frag() as\nfalse.\n\nThe mismatch is harmful in any in-place writer that uses\nskb_has_shared_frag() to decide whether shared pages must be detoured\nthrough skb_cow_data().  ESP input is one such writer (esp4.c,\nesp6.c), and a single nft \u0027dup to \u003clocal\u003e\u0027 rule -- or any other\nnf_dup_ipv4() / xt_TEE caller -- is enough to land a pskb_copy()\u0027d\nskb in esp_input() with the marker stripped, letting an unprivileged\nuser write into the page cache of a root-owned read-only file via\nauthencesn-ESN stray writes.\n\nSet SKBFL_SHARED_FRAG on the destination whenever frag descriptors\nwere actually moved from the source.  skb_copy() and skb_copy_expand()\nshare skb_copy_header() too but linearize all paged data into freshly\nallocated head storage and emerge with nr_frags == 0, so\nskb_has_shared_frag() returns false on its own; they need no change.\n\nThe same omission exists in skb_gro_receive() and skb_gro_receive_list().\nThe former moves the incoming skb\u0027s frag descriptors into the\naccumulator\u0027s last sub-skb via two paths (a direct frag-move loop and\nthe head_frag + memcpy path); the latter chains the incoming skb whole\nonto p\u0027s frag_list.  Downstream skb_segment() reads only\nskb_shinfo(p)-\u003eflags, and skb_segment_list() reuses each sub-skb\u0027s\nshinfo as the nskb -- both p and lp must carry the marker.\n\nThe same omission also exists in tcp_clone_payload(), which builds an\nMTU probe skb by moving frag descriptors from skbs on sk_write_queue\ninto a freshly allocated nskb.  The helper falls into the same family\nand warrants the same fix for consistency; no TCP TX-side in-place\nwriter is currently known to reach a user page through this gap, but\na future consumer depending on the marker would regress silently.\n\nThe same omission exists in skb_segment(): the per-iteration flag\nmerge takes only head_skb\u0027s flag, and the inner switch that rebinds\nfrag_skb to list_skb on head_skb-frags exhaustion does not fold the\nnew frag_skb\u0027s flag into nskb.  Fold frag_skb\u0027s flag at both sites\nso segments drawing frags from frag_list members carry the marker."
        }
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          "cvssV3_1": {
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
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      "providerMetadata": {
        "dateUpdated": "2026-06-14T17:45:49.109Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/fbeab9555564a1b98e8582cd106dfe46c4606991"
        },
        {
          "url": "https://git.kernel.org/stable/c/179f1852bdedc300e373e807cc102cd81feff196"
        },
        {
          "url": "https://git.kernel.org/stable/c/12401fcfb01f53ccc63ab0a3246570fe8f3105ee"
        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/9bc9d6d6967a2239aa57af2aa53554eddd640d20"
        },
        {
          "url": "https://git.kernel.org/stable/c/48f6a5356a33dd78e7144ae1faef95ffc990aae0"
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      "title": "net: skbuff: propagate shared-frag marker through frag-transfer helpers",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43503",
    "datePublished": "2026-05-23T11:44:01.103Z",
    "dateReserved": "2026-05-01T14:12:56.014Z",
    "dateUpdated": "2026-07-03T12:05:13.320Z",
    "state": "PUBLISHED"
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}