CVE-2026-52961— Linux kernel 安全漏洞
一分钟漏洞结论
影响对象
Linux Linux
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
Linux kernel是美国Linux基金会开源的操作系统Linux所使用的内核。 Linux kernel 6.0版本存在安全漏洞，该漏洞源于__ceph_build_xattrs_blob()中因陈旧blob大小引发的BUG_ON。
影响版本矩阵 10
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | d93231a6bc8a452323d5fef16cca7107ce483a27< 7eb72425c4e3234926502eb262f9d6193ccd572c |
affected |
d93231a6bc8a452323d5fef16cca7107ce483a27< d5bd8b4e39cfa8b087448adcd48088065cd629d5 |
affected | ||
d93231a6bc8a452323d5fef16cca7107ce483a27< 368d21ae9081c93497b1c8163bed3eddcb2443ff |
affected | ||
d93231a6bc8a452323d5fef16cca7107ce483a27< 0c22d9511cbde746622f8e4c11aaa63fe76d45f9 |
affected | ||
6.0 |
affected | ||
< 6.0 |
unaffected | ||
6.12.91≤ 6.12.* |
unaffected | ||
6.18.33≤ 6.18.* |
unaffected | ||
| … +2 条更多 | |||
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一、 漏洞 CVE-2026-52961 基础信息
漏洞信息
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Vulnerability Title
ceph: fix BUG_ON in __ceph_build_xattrs_blob() due to stale blob size
来源: CVE Program / CVE List V5
Vulnerability 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+ #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---
来源: CVE Program / CVE List V5
CVSS Information
N/A
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Linux kernel是美国Linux基金会开源的操作系统Linux所使用的内核。 Linux kernel 6.0版本存在安全漏洞，该漏洞源于__ceph_build_xattrs_blob()中因陈旧blob大小引发的BUG_ON。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2026-52961 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-52961 补丁与修复 (4)
同批安全公告 · Linux · 2026-06-24 · 共 219 条
| CVE-2026-53049 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-52993 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-52989 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-52986 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-52982 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-53002 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-53006 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-53045 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-53086 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-53046 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-52955 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-53010 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-53088 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-52914 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-53055 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-52924 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-52931 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-52999 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-53043 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-52958 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
显示前 20 条，共 219 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-52961
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