CVE-2026-23249— 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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于xrep_revalidate_allocbt函数中未检查已删除的游标，可能导致空指针取消引用。
影响版本矩阵 10
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | dbfbf3bdf639a20da7d5fb390cd2e197d25aa418< d69de525bc7ab27713342080bf50826df3f6a68f |
affected |
dbfbf3bdf639a20da7d5fb390cd2e197d25aa418< b04baa848c0543b240b1bd8aecff470382f6f154 |
affected | ||
dbfbf3bdf639a20da7d5fb390cd2e197d25aa418< 5991e96f2ae82df60a3e4ed00f3432d9f3502a99 |
affected | ||
dbfbf3bdf639a20da7d5fb390cd2e197d25aa418< 55e03b8cbe2783ec9acfb88e8adb946ed504e117 |
affected | ||
6.8 |
affected | ||
< 6.8 |
unaffected | ||
6.12.75≤ 6.12.* |
unaffected | ||
6.18.16≤ 6.18.* |
unaffected | ||
| … +2 条更多 | |||
获取后续新漏洞提醒
登录后订阅
一、 漏洞 CVE-2026-23249 基础信息
漏洞信息
对漏洞内容有疑问？看看神龙的深度分析是否有帮助！
查看神龙十问 ↗
尽管我们使用了先进的大模型技术，但其输出仍可能包含不准确或过时的信息。神龙努力确保数据的准确性，但请您根据实际情况进行核实和判断。
Vulnerability Title
xfs: check for deleted cursors when revalidating two btrees
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
xfs: check for deleted cursors when revalidating two btrees
The free space and inode btree repair functions will rebuild both btrees
at the same time, after which it needs to evaluate both btrees to
confirm that the corruptions are gone.
However, Jiaming Zhang ran syzbot and produced a crash in the second
xchk_allocbt call. His root-cause analysis is as follows (with minor
corrections):
In xrep_revalidate_allocbt(), xchk_allocbt() is called twice (first
for BNOBT, second for CNTBT). The cause of this issue is that the
first call nullified the cursor required by the second call.
Let's first enter xrep_revalidate_allocbt() via following call chain:
xfs_file_ioctl() ->
xfs_ioc_scrubv_metadata() ->
xfs_scrub_metadata() ->
`sc->ops->repair_eval(sc)` ->
xrep_revalidate_allocbt()
xchk_allocbt() is called twice in this function. In the first call:
/* Note that sc->sm->sm_type is XFS_SCRUB_TYPE_BNOPT now */
xchk_allocbt() ->
xchk_btree() ->
`bs->scrub_rec(bs, recp)` ->
xchk_allocbt_rec() ->
xchk_allocbt_xref() ->
xchk_allocbt_xref_other()
since sm_type is XFS_SCRUB_TYPE_BNOBT, pur is set to &sc->sa.cnt_cur.
Kernel called xfs_alloc_get_rec() and returned -EFSCORRUPTED. Call
chain:
xfs_alloc_get_rec() ->
xfs_btree_get_rec() ->
xfs_btree_check_block() ->
(XFS_IS_CORRUPT || XFS_TEST_ERROR), the former is false and the latter
is true, return -EFSCORRUPTED. This should be caused by
ioctl$XFS_IOC_ERROR_INJECTION I guess.
Back to xchk_allocbt_xref_other(), after receiving -EFSCORRUPTED from
xfs_alloc_get_rec(), kernel called xchk_should_check_xref(). In this
function, *curpp (points to sc->sa.cnt_cur) is nullified.
Back to xrep_revalidate_allocbt(), since sc->sa.cnt_cur has been
nullified, it then triggered null-ptr-deref via xchk_allocbt() (second
call) -> xchk_btree().
So. The bnobt revalidation failed on a cross-reference attempt, so we
deleted the cntbt cursor, and then crashed when we tried to revalidate
the cntbt. Therefore, check for a null cntbt cursor before that
revalidation, and mark the repair incomplete. Also we can ignore the
second tree entirely if the first tree was rebuilt but is already
corrupt.
Apply the same fix to xrep_revalidate_iallocbt because it has the same
problem.
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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于xrep_revalidate_allocbt函数中未检查已删除的游标，可能导致空指针取消引用。
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-2026-23249 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
AI 生成 POC
高级
未找到公开 POC。
登录以生成 AI POC三、漏洞 CVE-2026-23249 的情报信息
请登录查看更多情报信息。
CVE-2026-23249 补丁与修复 (4)
同批安全公告 · Linux · 2026-03-18 · 共 35 条
| CVE-2026-23246 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23268 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23270 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23253 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23243 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23245 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23248 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-71269 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-71268 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23242 | 7.5 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23269 | 7.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2026-23247 | Linux kernel 安全漏洞 | |
| CVE-2026-23244 | Linux kernel 安全漏洞 | |
| CVE-2026-23250 | Linux kernel 安全漏洞 | |
| CVE-2026-23251 | Linux kernel 安全漏洞 | |
| CVE-2026-23252 | Linux kernel 安全漏洞 | |
| CVE-2025-71267 | Linux kernel 安全漏洞 | |
| CVE-2025-71266 | Linux kernel 安全漏洞 | |
| CVE-2025-71265 | Linux kernel 安全漏洞 | |
| CVE-2025-71270 | Linux kernel 安全漏洞 |
显示前 20 条，共 35 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-23249
暂无评论