{
  "cveId": "CVE-2026-52961",
  "url": "https://patchblox.com/security/cve/CVE-2026-52961",
  "summary": "CVE-2026-52961 is fixed in 49 products on 1 platform, first by ALAS2023-2026-1894, released June 22, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  ceph: fix BUG_ON in __ceph_build_xattrs_blob() d...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  ceph: fix BUG_ON in __ceph_build_xattrs_blob() due to stale blob size  The generic/642 test-case can reproduce the kernel crash:  [40243.605254] ------------[ cut here ]------------ [40243.605956] kernel BUG at fs/ceph/xattr.c:918! [40243.607142] Oops: invalid opcode: 0000 [#1] SMP PTI [40243.608067] CPU: 7 UID: 0 PID: 498762 Comm: kworker/7:1 Not tainted 7.0.0-rc7\u002B #3 PREEMPT(full) [40243.609700] Hardware name: QEMU Ubuntu 25.10 PC v2 (i440FX \u002B PIIX, \u002B 10.1 machine, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [40243.611820] Workqueue: ceph-msgr ceph_con_workfn [40243.612715] RIP: 0010:__ceph_build_xattrs_blob\u002B0x1b8/0x1e0 [40243.613731] Code: 0f 84 82 fe ff ff e9 cf 8e 56 ff 48 8d 65 e8 31 c0 5b 41 5c 41 5d 5d 31 d2 31 c9 31 f6 31 ff 45 31 c0 45 31 c9 c3 cc cc cc cc \u003C0f\u003E 0b 4c 8b 62 08 41 8b 85 24 07 00 00 49 83 c4 04 41 89 44 24 fc [40243.616888] RSP: 0018:ffffcc80c4d4b688 EFLAGS: 00010287 [40243.617773] RAX: 0000000000010026 RBX: 0000000000000001 RCX: 0000000000000000 [40243.618928] RDX: ffff8a773798dee0 RSI: 0000000000000000 RDI: 0000000000000000 [40243.620158] RBP: ffffcc80c4d4b6a0 R08: 0000000000000000 R09: 0000000000000000 [40243.621573] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8a75f3b58000 [40243.622907] R13: ffff8a75f3b58000 R14: 0000000000000080 R15: 000000000000bffd [40243.624054] FS:  0000000000000000(0000) GS:ffff8a787d1b4000(0000) knlGS:0000000000000000 [40243.625331] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [40243.626269] CR2: 000072f390b623c0 CR3: 000000011c02a003 CR4: 0000000000372ef0 [40243.627408] Call Trace: [40243.627839]  \u003CTASK\u003E [40243.628188]  __prep_cap\u002B0x3fd/0x4a0 [40243.628789]  ? do_raw_spin_unlock\u002B0x4e/0xe0 [40243.629474]  ceph_check_caps\u002B0x46a/0xc80 [40243.630094]  ? __lock_acquire\u002B0x4a2/0x2650 [40243.630773]  ? find_held_lock\u002B0x31/0x90 [40243.631347]  ? handle_cap_grant\u002B0x79f/0x1060 [40243.632068]  ? lock_release\u002B0xd9/0x300 [40243.632696]  ? __mutex_unlock_slowpath\u002B0x3e/0x340 [40243.633429]  ? lock_release\u002B0xd9/0x300 [40243.634052]  handle_cap_grant\u002B0xcf6/0x1060 [40243.634745]  ceph_handle_caps\u002B0x122b/0x2110 [40243.635415]  mds_dispatch\u002B0x5bd/0x2160 [40243.636034]  ? ceph_con_process_message\u002B0x65/0x190 [40243.636828]  ? lock_release\u002B0xd9/0x300 [40243.637431]  ceph_con_process_message\u002B0x7a/0x190 [40243.638184]  ? kfree\u002B0x311/0x4f0 [40243.638749]  ? kfree\u002B0x311/0x4f0 [40243.639268]  process_message\u002B0x16/0x1a0 [40243.639915]  ? sg_free_table\u002B0x39/0x90 [40243.640572]  ceph_con_v2_try_read\u002B0xf58/0x2120 [40243.641255]  ? lock_acquire\u002B0xc8/0x300 [40243.641863]  ceph_con_workfn\u002B0x151/0x820 [40243.642493]  process_one_work\u002B0x22f/0x630 [40243.643093]  ? process_one_work\u002B0x254/0x630 [40243.643770]  worker_thread\u002B0x1e2/0x400 [40243.644332]  ? __pfx_worker_thread\u002B0x10/0x10 [40243.645020]  kthread\u002B0x109/0x140 [40243.645560]  ? __pfx_kthread\u002B0x10/0x10 [40243.646125]  ret_from_fork\u002B0x3f8/0x480 [40243.646752]  ? __pfx_kthread\u002B0x10/0x10 [40243.647316]  ? __pfx_kthread\u002B0x10/0x10 [40243.647919]  ret_from_fork_asm\u002B0x1a/0x30 [40243.648556]  \u003C/TASK\u003E [40243.648902] Modules linked in: overlay hctr2 libpolyval chacha libchacha adiantum libnh libpoly1305 essiv intel_rapl_msr intel_rapl_common intel_uncore_frequency_common skx_edac_common nfit kvm_intel kvm irqbypass joydev ghash_clmulni_intel aesni_intel rapl input_leds mac_hid psmouse vga16fb serio_raw vgastate floppy i2c_piix4 pata_acpi bochs qemu_fw_cfg i2c_smbus sch_fq_codel rbd dm_crypt msr parport_pc ppdev lp parport efi_pstore [40243.654766] ---[ end trace 0000000000000000 ]---  Commit d93231a6bc8a (\u0022ceph: prevent a client from exceeding the MDS maximum xattr size\u0022) moved the required_blob_size computation to before the __build_xattrs() call, introducing a race.  __build_xattrs() releases and reacquires i_ceph_lock during execution. In that window, handle_cap_grant() may update i_xattrs.blob with a newer MDS-provided blob and bump i_xattrs.version.  When __bui ---truncated---",
  "published": "2026-06-22T09:00:00Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00145,
  "epssPercentile": 0.03782,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
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    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
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}