{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-52961 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-52961 is a medium-severity denial of service vulnerability in Linux kernel, published on 24 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-52961 and fix it if it is affected.\n\nWhat it is: CVE-2026-52961 is a medium-severity denial of service vulnerability in Linux kernel, published on 24 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-52961 in the wild and no public exploit code.\n\nAffected product: Linux kernel. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-52961/ (Markdown: https://insights.sbomify.com/CVE-2026-52961/index.md)","id":"CVE-2026-52961","markdown":"https://insights.sbomify.com/CVE-2026-52961/index.md","name":"CVE-2026-52961","record":{"aliases":["AZL-90717","BELL-CVE-2026-52961","DEBIAN-CVE-2026-52961","GHSA-7c47-vxfh-p7q4","ROOT-OS-DEBIAN-12-CVE-2026-52961","ROOT-OS-UBUNTU-2404-CVE-2026-52961","UBUNTU-CVE-2026-52961"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel Ceph","requires_auth":"low_privilege","summary":"A stale blob size in the Ceph filesystem driver causes a kernel BUG_ON crash, leading to a denial of service.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[{"product":"linux_kernel","vendor":"linux"}],"cvss":{"score":5.5,"severity":"medium","source":"nvd","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-617","name":"Reachable Assertion"}],"description":"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---","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"ceph: fix BUG_ON in __ceph_build_xattrs_blob() due to stale blob size","id":"CVE-2026-52961","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"denial_of_service","year":"2026"},"n_packages":0,"n_references":5,"next":{"headline":"ceph: fix a buffer leak in __ceph_setxattr()","id":"CVE-2026-52962"},"packages":[],"prev":{"headline":"ceph: put folios not suitable for writeback","id":"CVE-2026-52960"},"products":["Linux"],"published":"2026-06-24","related":[{"cvss_score":8.8,"headline":"Linux Kernel Out-of-Bounds Write","id":"CVE-2026-53266","kev_date_added":"2026-09-18","published":"2026-06-25"},{"cvss_score":8.8,"headline":"Linux Kernel Improper Input Validation","id":"CVE-2013-6282","kev_date_added":"2022-09-15","published":"2013-11-19"},{"cvss_score":8.4,"headline":"Linux Kernel Heap-Based Buffer Overflow","id":"CVE-2022-0185","kev_date_added":"2024-08-21","published":"2022-02-11"},{"cvss_score":8.4,"headline":"Linux Kernel Privilege Escalation","id":"CVE-2013-2094","kev_date_added":"2022-09-15","published":"2013-05-14"},{"cvss_score":7.8,"headline":"Linux Kernel Unspecified","id":"CVE-2026-53362","kev_date_added":"2026-08-27","published":"2026-07-04"},{"cvss_score":7.8,"headline":"Linux Kernel Missing Initialization of a Variable","id":"CVE-2026-46300","kev_date_added":"2026-10-28","published":"2026-05-23"},{"cvss_score":7.8,"headline":"Linux Kernel Race Condition","id":"CVE-2025-39964","kev_date_added":"2026-09-18","published":"2025-10-13"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-09-14","vendors":["Linux"]},"summary":"A stale blob size in the Ceph filesystem driver causes a kernel BUG_ON crash, leading to a denial of service.","url":"https://insights.sbomify.com/CVE-2026-52961/"}