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CVE-2026-52961 (GCVE-0-2026-52961)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:28 – Updated: 2026-09-14 11:58
VLAI
Title
ceph: fix BUG_ON in __ceph_build_xattrs_blob() due to stale blob size
Summary
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+ #3 PREEMPT(full) [40243.609700] Hardware name: QEMU Ubuntu 25.10 PC v2 (i440FX + PIIX, + 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+0x1b8/0x1e0 [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 <0f> 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] <TASK> [40243.628188] __prep_cap+0x3fd/0x4a0 [40243.628789] ? do_raw_spin_unlock+0x4e/0xe0 [40243.629474] ceph_check_caps+0x46a/0xc80 [40243.630094] ? __lock_acquire+0x4a2/0x2650 [40243.630773] ? find_held_lock+0x31/0x90 [40243.631347] ? handle_cap_grant+0x79f/0x1060 [40243.632068] ? lock_release+0xd9/0x300 [40243.632696] ? __mutex_unlock_slowpath+0x3e/0x340 [40243.633429] ? lock_release+0xd9/0x300 [40243.634052] handle_cap_grant+0xcf6/0x1060 [40243.634745] ceph_handle_caps+0x122b/0x2110 [40243.635415] mds_dispatch+0x5bd/0x2160 [40243.636034] ? ceph_con_process_message+0x65/0x190 [40243.636828] ? lock_release+0xd9/0x300 [40243.637431] ceph_con_process_message+0x7a/0x190 [40243.638184] ? kfree+0x311/0x4f0 [40243.638749] ? kfree+0x311/0x4f0 [40243.639268] process_message+0x16/0x1a0 [40243.639915] ? sg_free_table+0x39/0x90 [40243.640572] ceph_con_v2_try_read+0xf58/0x2120 [40243.641255] ? lock_acquire+0xc8/0x300 [40243.641863] ceph_con_workfn+0x151/0x820 [40243.642493] process_one_work+0x22f/0x630 [40243.643093] ? process_one_work+0x254/0x630 [40243.643770] worker_thread+0x1e2/0x400 [40243.644332] ? __pfx_worker_thread+0x10/0x10 [40243.645020] kthread+0x109/0x140 [40243.645560] ? __pfx_kthread+0x10/0x10 [40243.646125] ret_from_fork+0x3f8/0x480 [40243.646752] ? __pfx_kthread+0x10/0x10 [40243.647316] ? __pfx_kthread+0x10/0x10 [40243.647919] ret_from_fork_asm+0x1a/0x30 [40243.648556] </TASK> [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 ("ceph: prevent a client from exceeding the MDS maximum xattr size") 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---
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: d93231a6bc8a452323d5fef16cca7107ce483a27 , < d161c4456672f8c431e3bdf9bea817b490d14181 (git)
Affected: d93231a6bc8a452323d5fef16cca7107ce483a27 , < 7eb72425c4e3234926502eb262f9d6193ccd572c (git)
Affected: d93231a6bc8a452323d5fef16cca7107ce483a27 , < d5bd8b4e39cfa8b087448adcd48088065cd629d5 (git)
Affected: d93231a6bc8a452323d5fef16cca7107ce483a27 , < 368d21ae9081c93497b1c8163bed3eddcb2443ff (git)
Affected: d93231a6bc8a452323d5fef16cca7107ce483a27 , < 0c22d9511cbde746622f8e4c11aaa63fe76d45f9 (git)
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Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.91 , ≤ 6.12.* (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/ceph/xattr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "d161c4456672f8c431e3bdf9bea817b490d14181",
              "status": "affected",
              "version": "d93231a6bc8a452323d5fef16cca7107ce483a27",
              "versionType": "git"
            },
            {
              "lessThan": "7eb72425c4e3234926502eb262f9d6193ccd572c",
              "status": "affected",
              "version": "d93231a6bc8a452323d5fef16cca7107ce483a27",
              "versionType": "git"
            },
            {
              "lessThan": "d5bd8b4e39cfa8b087448adcd48088065cd629d5",
              "status": "affected",
              "version": "d93231a6bc8a452323d5fef16cca7107ce483a27",
              "versionType": "git"
            },
            {
              "lessThan": "368d21ae9081c93497b1c8163bed3eddcb2443ff",
              "status": "affected",
              "version": "d93231a6bc8a452323d5fef16cca7107ce483a27",
              "versionType": "git"
            },
            {
              "lessThan": "0c22d9511cbde746622f8e4c11aaa63fe76d45f9",
              "status": "affected",
              "version": "d93231a6bc8a452323d5fef16cca7107ce483a27",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/ceph/xattr.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.0"
            },
            {
              "lessThan": "6.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.91",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.33",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.91",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.33",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.10",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nceph: fix BUG_ON in __ceph_build_xattrs_blob() due to stale blob size\n\nThe generic/642 test-case can reproduce the kernel crash:\n\n[40243.605254] ------------[ cut here ]------------\n[40243.605956] kernel BUG at fs/ceph/xattr.c:918!\n[40243.607142] Oops: invalid opcode: 0000 [#1] SMP PTI\n[40243.608067] CPU: 7 UID: 0 PID: 498762 Comm: kworker/7:1 Not tainted 7.0.0-rc7+ #3 PREEMPT(full)\n[40243.609700] Hardware name: QEMU Ubuntu 25.10 PC v2 (i440FX + PIIX, + 10.1 machine, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\n[40243.611820] Workqueue: ceph-msgr ceph_con_workfn\n[40243.612715] RIP: 0010:__ceph_build_xattrs_blob+0x1b8/0x1e0\n[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\n[40243.616888] RSP: 0018:ffffcc80c4d4b688 EFLAGS: 00010287\n[40243.617773] RAX: 0000000000010026 RBX: 0000000000000001 RCX: 0000000000000000\n[40243.618928] RDX: ffff8a773798dee0 RSI: 0000000000000000 RDI: 0000000000000000\n[40243.620158] RBP: ffffcc80c4d4b6a0 R08: 0000000000000000 R09: 0000000000000000\n[40243.621573] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8a75f3b58000\n[40243.622907] R13: ffff8a75f3b58000 R14: 0000000000000080 R15: 000000000000bffd\n[40243.624054] FS:  0000000000000000(0000) GS:ffff8a787d1b4000(0000) knlGS:0000000000000000\n[40243.625331] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[40243.626269] CR2: 000072f390b623c0 CR3: 000000011c02a003 CR4: 0000000000372ef0\n[40243.627408] Call Trace:\n[40243.627839]  \u003cTASK\u003e\n[40243.628188]  __prep_cap+0x3fd/0x4a0\n[40243.628789]  ? do_raw_spin_unlock+0x4e/0xe0\n[40243.629474]  ceph_check_caps+0x46a/0xc80\n[40243.630094]  ? __lock_acquire+0x4a2/0x2650\n[40243.630773]  ? find_held_lock+0x31/0x90\n[40243.631347]  ? handle_cap_grant+0x79f/0x1060\n[40243.632068]  ? lock_release+0xd9/0x300\n[40243.632696]  ? __mutex_unlock_slowpath+0x3e/0x340\n[40243.633429]  ? lock_release+0xd9/0x300\n[40243.634052]  handle_cap_grant+0xcf6/0x1060\n[40243.634745]  ceph_handle_caps+0x122b/0x2110\n[40243.635415]  mds_dispatch+0x5bd/0x2160\n[40243.636034]  ? ceph_con_process_message+0x65/0x190\n[40243.636828]  ? lock_release+0xd9/0x300\n[40243.637431]  ceph_con_process_message+0x7a/0x190\n[40243.638184]  ? kfree+0x311/0x4f0\n[40243.638749]  ? kfree+0x311/0x4f0\n[40243.639268]  process_message+0x16/0x1a0\n[40243.639915]  ? sg_free_table+0x39/0x90\n[40243.640572]  ceph_con_v2_try_read+0xf58/0x2120\n[40243.641255]  ? lock_acquire+0xc8/0x300\n[40243.641863]  ceph_con_workfn+0x151/0x820\n[40243.642493]  process_one_work+0x22f/0x630\n[40243.643093]  ? process_one_work+0x254/0x630\n[40243.643770]  worker_thread+0x1e2/0x400\n[40243.644332]  ? __pfx_worker_thread+0x10/0x10\n[40243.645020]  kthread+0x109/0x140\n[40243.645560]  ? __pfx_kthread+0x10/0x10\n[40243.646125]  ret_from_fork+0x3f8/0x480\n[40243.646752]  ? __pfx_kthread+0x10/0x10\n[40243.647316]  ? __pfx_kthread+0x10/0x10\n[40243.647919]  ret_from_fork_asm+0x1a/0x30\n[40243.648556]  \u003c/TASK\u003e\n[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\n[40243.654766] ---[ end trace 0000000000000000 ]---\n\nCommit d93231a6bc8a (\"ceph: prevent a client from exceeding the MDS\nmaximum xattr size\") moved the required_blob_size computation to before\nthe __build_xattrs() call, introducing a race.\n\n__build_xattrs() releases and reacquires i_ceph_lock during execution.\nIn that window, handle_cap_grant() may update i_xattrs.blob with a\nnewer MDS-provided blob and bump i_xattrs.version.  When\n__bui\n---truncated---"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-14T11:58:27.954Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d161c4456672f8c431e3bdf9bea817b490d14181"
        },
        {
          "url": "https://git.kernel.org/stable/c/7eb72425c4e3234926502eb262f9d6193ccd572c"
        },
        {
          "url": "https://git.kernel.org/stable/c/d5bd8b4e39cfa8b087448adcd48088065cd629d5"
        },
        {
          "url": "https://git.kernel.org/stable/c/368d21ae9081c93497b1c8163bed3eddcb2443ff"
        },
        {
          "url": "https://git.kernel.org/stable/c/0c22d9511cbde746622f8e4c11aaa63fe76d45f9"
        }
      ],
      "title": "ceph: fix BUG_ON in __ceph_build_xattrs_blob() due to stale blob size",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-52961",
    "datePublished": "2026-06-24T16:28:41.836Z",
    "dateReserved": "2026-06-09T07:44:35.374Z",
    "dateUpdated": "2026-09-14T11:58:27.954Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-52961",
      "date": "2026-09-16",
      "epss": "0.00144",
      "percentile": "0.04051"
    },
    "microsoft_vex": {
      "current_release_date": "2026-08-13T00:14:35.000Z",
      "cve": "CVE-2026-52961",
      "id": "msrc_CVE-2026-52961",
      "initial_release_date": "2026-06-27T01:13:44.000Z",
      "product_status:known_affected": "4",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "ceph: fix BUG_ON in __ceph_build_xattrs_blob() due to stale blob size",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-52961.json",
      "version": "4"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-52961\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-06-24T17:17:06.360\",\"lastModified\":\"2026-09-14T12:17:42.693\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nceph: fix BUG_ON in __ceph_build_xattrs_blob() due to stale blob size\\n\\nThe generic/642 test-case can reproduce the kernel crash:\\n\\n[40243.605254] ------------[ cut here ]------------\\n[40243.605956] kernel BUG at fs/ceph/xattr.c:918!\\n[40243.607142] Oops: invalid opcode: 0000 [#1] SMP PTI\\n[40243.608067] CPU: 7 UID: 0 PID: 498762 Comm: kworker/7:1 Not tainted 7.0.0-rc7+ #3 PREEMPT(full)\\n[40243.609700] Hardware name: QEMU Ubuntu 25.10 PC v2 (i440FX + PIIX, + 10.1 machine, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014\\n[40243.611820] Workqueue: ceph-msgr ceph_con_workfn\\n[40243.612715] RIP: 0010:__ceph_build_xattrs_blob+0x1b8/0x1e0\\n[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\\n[40243.616888] RSP: 0018:ffffcc80c4d4b688 EFLAGS: 00010287\\n[40243.617773] RAX: 0000000000010026 RBX: 0000000000000001 RCX: 0000000000000000\\n[40243.618928] RDX: ffff8a773798dee0 RSI: 0000000000000000 RDI: 0000000000000000\\n[40243.620158] RBP: ffffcc80c4d4b6a0 R08: 0000000000000000 R09: 0000000000000000\\n[40243.621573] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8a75f3b58000\\n[40243.622907] R13: ffff8a75f3b58000 R14: 0000000000000080 R15: 000000000000bffd\\n[40243.624054] FS:  0000000000000000(0000) GS:ffff8a787d1b4000(0000) knlGS:0000000000000000\\n[40243.625331] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n[40243.626269] CR2: 000072f390b623c0 CR3: 000000011c02a003 CR4: 0000000000372ef0\\n[40243.627408] Call Trace:\\n[40243.627839]  \u003cTASK\u003e\\n[40243.628188]  __prep_cap+0x3fd/0x4a0\\n[40243.628789]  ? do_raw_spin_unlock+0x4e/0xe0\\n[40243.629474]  ceph_check_caps+0x46a/0xc80\\n[40243.630094]  ? __lock_acquire+0x4a2/0x2650\\n[40243.630773]  ? find_held_lock+0x31/0x90\\n[40243.631347]  ? handle_cap_grant+0x79f/0x1060\\n[40243.632068]  ? lock_release+0xd9/0x300\\n[40243.632696]  ? __mutex_unlock_slowpath+0x3e/0x340\\n[40243.633429]  ? lock_release+0xd9/0x300\\n[40243.634052]  handle_cap_grant+0xcf6/0x1060\\n[40243.634745]  ceph_handle_caps+0x122b/0x2110\\n[40243.635415]  mds_dispatch+0x5bd/0x2160\\n[40243.636034]  ? ceph_con_process_message+0x65/0x190\\n[40243.636828]  ? lock_release+0xd9/0x300\\n[40243.637431]  ceph_con_process_message+0x7a/0x190\\n[40243.638184]  ? kfree+0x311/0x4f0\\n[40243.638749]  ? kfree+0x311/0x4f0\\n[40243.639268]  process_message+0x16/0x1a0\\n[40243.639915]  ? sg_free_table+0x39/0x90\\n[40243.640572]  ceph_con_v2_try_read+0xf58/0x2120\\n[40243.641255]  ? lock_acquire+0xc8/0x300\\n[40243.641863]  ceph_con_workfn+0x151/0x820\\n[40243.642493]  process_one_work+0x22f/0x630\\n[40243.643093]  ? process_one_work+0x254/0x630\\n[40243.643770]  worker_thread+0x1e2/0x400\\n[40243.644332]  ? __pfx_worker_thread+0x10/0x10\\n[40243.645020]  kthread+0x109/0x140\\n[40243.645560]  ? __pfx_kthread+0x10/0x10\\n[40243.646125]  ret_from_fork+0x3f8/0x480\\n[40243.646752]  ? __pfx_kthread+0x10/0x10\\n[40243.647316]  ? __pfx_kthread+0x10/0x10\\n[40243.647919]  ret_from_fork_asm+0x1a/0x30\\n[40243.648556]  \u003c/TASK\u003e\\n[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\\n[40243.654766] ---[ end trace 0000000000000000 ]---\\n\\nCommit d93231a6bc8a (\\\"ceph: prevent a client from exceeding the MDS\\nmaximum xattr size\\\") moved the required_blob_size computation to before\\nthe __build_xattrs() call, introducing a race.\\n\\n__build_xattrs() releases and reacquires i_ceph_lock during execution.\\nIn that window, handle_cap_grant() may update i_xattrs.blob with a\\nnewer MDS-provided blob and bump i_xattrs.version.  When\\n__bui\\n---truncated---\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/ceph/xattr.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"d93231a6bc8a452323d5fef16cca7107ce483a27\",\"lessThan\":\"d161c4456672f8c431e3bdf9bea817b490d14181\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d93231a6bc8a452323d5fef16cca7107ce483a27\",\"lessThan\":\"7eb72425c4e3234926502eb262f9d6193ccd572c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d93231a6bc8a452323d5fef16cca7107ce483a27\",\"lessThan\":\"d5bd8b4e39cfa8b087448adcd48088065cd629d5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d93231a6bc8a452323d5fef16cca7107ce483a27\",\"lessThan\":\"368d21ae9081c93497b1c8163bed3eddcb2443ff\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d93231a6bc8a452323d5fef16cca7107ce483a27\",\"lessThan\":\"0c22d9511cbde746622f8e4c11aaa63fe76d45f9\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/ceph/xattr.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.0\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.0\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.157\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.91\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.33\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.10\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-617\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.0\",\"versionEndExcluding\":\"6.12.91\",\"matchCriteriaId\":\"896B2EC2-6E66-4010-9768-4CB388F782AE\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.18.33\",\"matchCriteriaId\":\"96D99E49-380D-43AB-BDBA-25C3AD018A9C\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.19\",\"versionEndExcluding\":\"7.0.10\",\"matchCriteriaId\":\"A13475D2-59BF-4716-94B5-7C1D239A2CF4\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"B1EF7059-E670-45F4-B422-54C40FA86390\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"0D38F0BF-A728-4133-A358-D44A2F7EE6D6\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"EC732D08-5F7B-46D9-B154-E60C7F4F0A97\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0c22d9511cbde746622f8e4c11aaa63fe76d45f9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/368d21ae9081c93497b1c8163bed3eddcb2443ff\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7eb72425c4e3234926502eb262f9d6193ccd572c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d161c4456672f8c431e3bdf9bea817b490d14181\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d5bd8b4e39cfa8b087448adcd48088065cd629d5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-14T18:05:08+00:00",
      "cve": "CVE-2026-52961",
      "id": "CVE-2026-52961",
      "initial_release_date": "2026-06-24T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ceph: fix BUG_ON in __ceph_build_xattrs_blob() due to stale blob size",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52961.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T02:03:15Z",
      "cve": "CVE-2026-52961",
      "id": "CVE-2026-52961",
      "initial_release_date": "2026-06-26T02:14:39Z",
      "product_status:known_affected": "482",
      "product_status:known_not_affected": "238",
      "product_status:recommended": "105",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-52961",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-52961.json",
      "version": "12"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.