{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-52961", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.374Z", "datePublished": "2026-06-24T16:28:41.836Z", "dateUpdated": "2026-06-24T16:28:41.836Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-06-24T16:28:41.836Z"}, "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 <0f> 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] <TASK>\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] </TASK>\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": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ceph/xattr.c"], "versions": [{"version": "d93231a6bc8a452323d5fef16cca7107ce483a27", "lessThan": "7eb72425c4e3234926502eb262f9d6193ccd572c", "status": "affected", "versionType": "git"}, {"version": "d93231a6bc8a452323d5fef16cca7107ce483a27", "lessThan": "d5bd8b4e39cfa8b087448adcd48088065cd629d5", "status": "affected", "versionType": "git"}, {"version": "d93231a6bc8a452323d5fef16cca7107ce483a27", "lessThan": "368d21ae9081c93497b1c8163bed3eddcb2443ff", "status": "affected", "versionType": "git"}, {"version": "d93231a6bc8a452323d5fef16cca7107ce483a27", "lessThan": "0c22d9511cbde746622f8e4c11aaa63fe76d45f9", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["fs/ceph/xattr.c"], "versions": [{"version": "6.0", "status": "affected"}, {"version": "0", "lessThan": "6.0", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.91", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.33", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0.10", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.12.91"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "6.18.33"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "7.0.10"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0", "versionEndExcluding": "7.1"}]}]}], "references": [{"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"}}}}

{}

{}

{"bugzilla": {"description": "kernel: ceph: fix BUG_ON in __ceph_build_xattrs_blob() due to stale blob size", "id": "2492372", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492372"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-367", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nceph: fix BUG_ON in __ceph_build_xattrs_blob() due to stale blob size\nThe generic/642 test-case can reproduce the kernel crash:\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 <0f> 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] <TASK>\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] </TASK>\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 ]---\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__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---", "A flaw was found in the Linux kernel's Ceph filesystem component. A race condition exists in the `__ceph_build_xattrs_blob()` function where the required extended attribute (xattr) blob size is computed before the `__build_xattrs()` call. During this window, another process can update the xattr blob, leading to a stale size calculation. This can result in a kernel crash, causing a Denial of Service (DoS) to the system."], "name": "CVE-2026-52961", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-06-24T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-52961\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-52961\nhttps://lore.kernel.org/linux-cve-announce/2026062436-CVE-2026-52961-c768@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d93231a6bc8a452323d5fef16cca7107ce483a27,7eb72425c4e3234926502eb262f9d6193ccd572c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d93231a6bc8a452323d5fef16cca7107ce483a27,d5bd8b4e39cfa8b087448adcd48088065cd629d5)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d93231a6bc8a452323d5fef16cca7107ce483a27,368d21ae9081c93497b1c8163bed3eddcb2443ff)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d93231a6bc8a452323d5fef16cca7107ce483a27,0c22d9511cbde746622f8e4c11aaa63fe76d45f9)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[6.0,*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,6.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.91,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.33,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0.10,7.0.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-06-24T19:15:15.570889+00:00", "updated": "2026-06-27T01:30:09.438646+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-367", "CWE-399", "CWE-754"]}