Linux/Unix 主机中安装的一个或多个程序包受到一个漏洞影响，而供应商没有提供补丁程序。

  - net: skb修复 KFENCE 分配的 skb 头的跨缓存释放。SKB_SMALL_HEAD_CACHE_SIZE 故意设置为非 2 的幂值例如 x86_64 上的 704以避免与通用 kmalloc 存储段大小冲突。这可确保 skb_kfree_head() 可靠地使用 skb_end_offset 来区分从 skb_small_head_cache 分配的 skb 头还是从通用 kmalloc 缓存分配。然而当 KFENCE 启用时kfence_ksize() 会返回所请求的确切分配大小而非 slab 存储段大小。如果调用程序例如 bpf_test_init通过 kzalloc() 分配 skb 头数据且请求的大小正好等于 SKB_SMALL_HEAD_CACHE_SIZE则 slab_build_skb() -> ksize() 将返回该确切值。在减去 skb_shared_info 开销后skb_end_offset 最终会匹配 SKB_SMALL_HEAD_HEADROOM从而导致 skb_kfree_head() 错误地将对象释放到 skb_small_head_cache而不是返回到原始 kmalloc 缓存从而导致 slab 跨缓存释放kmem_cache_free(skbuff_small_head)错误的 slab 缓存。本应是 skbuff_small_head但得到了 kmalloc-1k 请通过始终调用 skb_kfree_head() 中的 kfree(head) 来修复此问题。这可保持自由路径通用，并避免对 KFENCE 对象进行分配器特定的错误分类。 (CVE-2026-31429)

请注意，Nessus 依赖供应商报告的程序包是否存在进行判断。

Linux/Unix 主機上安裝了一個或多個受到弱點影響的套件，且供應商未提供可用的修補程式。

  - netskb修正由 KFENCE 配置的 skb 標頭造成的跨快取釋放問題。SKB_SMALL_HEAD_CACHE_SIZE 刻意設定為非 2 的次方值 (例如 x86_64 上的 704)以避免與一般 kmalloc 值區大小衝突。這可確保 skb_kfree_head() 可以可靠地使用 skb_end_offset 來區分從 skb_small_head_cache 和一般 kmalloc 快取配置的 skb 磁頭。不過啟用 KFENCE 時kfence_ksize() 會傳回確切要求的配置大小而非 slab 值區大小。如果呼叫端 (例如 bpf_test_init) 透過 kzalloc() 配置 skb 標頭資料且所要求的大小剛好等於 SKB_SMALL_HEAD_CACHE_SIZE則 slab_build_skb() -> ksize() 會傳回該確切值。減去 skb_shared_info 額外負荷後skb_end_offset 最終符合 SKB_SMALL_HEAD_HEADROOM造成 skb_kfree_head() 錯誤地將物件釋放到 skb_small_head_cache 而非釋放回原始的 kmalloc 快取進而導致平台交叉快取釋放 kmem_cache_free(skbuff_small_head)錯誤的平台快取。預期為 skbuff_small_head但得到的是 kmalloc-1k透過一律在 skb_kfree_head() 中呼叫 kfree(head) 來修正此問題。如此可使可用路徑保持通用並避免 KFENCE 物件發生特定配置器的錯誤分類。 (CVE-2026-31429)

請注意，Nessus 的判定取決於廠商所報告的套件是否存在。

Linux/Unix ホストには、ベンダーが提供するパッチが利用できない脆弱性の影響を受ける複数のパッケージがインストールされています。

  - netskbKFENCE 割り当て済み skb ヘッドのクロスキャッシュ解放を修正。SKB_SMALL_HEAD_CACHE_SIZE が意図的に非 power-of-2 値x86_64 の 704に設定され、一般的な kmalloc バケットサイズとの衝突を回避します。これにより、skb_kfree_head() は skb_end_offset を使用して、skb_small_head_cache と汎用 kmalloc キャッシュから割り当てられた skb ヘッドを区別できます。ただし、KFENCEが有効になっている場合、kfence_ksize()はスラブバケットサイズの代わりに正確なリクエストされた割り当てサイズを返します。呼び出し元bpf_test_initが kzalloc() 経由で skb ヘッドデータを割り当て、リクエストされたサイズが SKB_SMALL_HEAD_CACHE_SIZE になる場合、slab_build_skb() -> ksize() はその正確な値を返します。skb_shared_info オーバーヘッドを減算した後、skb_end_offset は SKB_SMALL_HEAD_HEADROOM と一致し、 skb_kfree_head() によってオブジェクトが元の kmalloc キャッシュに戻される代わりに skb_small_head_cache に不適切に解放されます。その結果、スラブクロスキャッシュが解放されます kmem_cache_free(skbuff_small_head) Wrong slab キャッシュ。skbuff_small_head を期待していましたが、kmalloc-1k を取得していました skb_kfree_head() で常に kfree(head) を呼び出すことで、これを修正します。これにより、フリーパスを汎用に保ち、KFENCE オブジェクトのアロケーター固有の誤分類を回避します。CVE-2026-31429

Nessus は、ベンダーによって報告されたパッケージの存在に依存していることに注意してください。

The remote Debian 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6238 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6238-1                   security@debian.org     https://www.debian.org/security/                     Salvatore Bonaccorso     April 30, 2026                        https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : linux     CVE ID         : CVE-2024-14027 CVE-2025-21709 CVE-2025-22116 CVE-2025-22117                      CVE-2025-38426 CVE-2025-38627 CVE-2025-39764 CVE-2025-40005                      CVE-2025-40135 CVE-2025-40147 CVE-2025-40150 CVE-2025-40219                      CVE-2025-68175 CVE-2025-68239 CVE-2025-68334 CVE-2025-68736                      CVE-2025-71152 CVE-2025-71161 CVE-2025-71221 CVE-2025-71239                      CVE-2025-71265 CVE-2025-71266 CVE-2025-71267 CVE-2025-71269                      CVE-2026-22981 CVE-2026-22985 CVE-2026-22986 CVE-2026-22993                      CVE-2026-23004 CVE-2026-23066 CVE-2026-23070 CVE-2026-23104                      CVE-2026-23138 CVE-2026-23157 CVE-2026-23207 CVE-2026-23210                      CVE-2026-23226 CVE-2026-23227 CVE-2026-23231 CVE-2026-23239                      CVE-2026-23240 CVE-2026-23242 CVE-2026-23243 CVE-2026-23244                      CVE-2026-23245 CVE-2026-23246 CVE-2026-23249 CVE-2026-23250                      CVE-2026-23251 CVE-2026-23252 CVE-2026-23253 CVE-2026-23255                      CVE-2026-23270 CVE-2026-23271 CVE-2026-23273 CVE-2026-23274                      CVE-2026-23276 CVE-2026-23277 CVE-2026-23278 CVE-2026-23279                      CVE-2026-23281 CVE-2026-23284 CVE-2026-23285 CVE-2026-23286                      CVE-2026-23287 CVE-2026-23289 CVE-2026-23290 CVE-2026-23291                      CVE-2026-23292 CVE-2026-23293 CVE-2026-23296 CVE-2026-23297                      CVE-2026-23298 CVE-2026-23300 CVE-2026-23302 CVE-2026-23303                      CVE-2026-23304 CVE-2026-23306 CVE-2026-23307 CVE-2026-23308                      CVE-2026-23310 CVE-2026-23312 CVE-2026-23313 CVE-2026-23315                      CVE-2026-23316 CVE-2026-23317 CVE-2026-23318 CVE-2026-23319                      CVE-2026-23321 CVE-2026-23324 CVE-2026-23325 CVE-2026-23330                      CVE-2026-23334 CVE-2026-23335 CVE-2026-23336 CVE-2026-23339                      CVE-2026-23340 CVE-2026-23343 CVE-2026-23347 CVE-2026-23351                      CVE-2026-23352 CVE-2026-23354 CVE-2026-23356 CVE-2026-23357                      CVE-2026-23359 CVE-2026-23360 CVE-2026-23361 CVE-2026-23362                      CVE-2026-23363 CVE-2026-23364 CVE-2026-23365 CVE-2026-23367                      CVE-2026-23368 CVE-2026-23369 CVE-2026-23370 CVE-2026-23372                      CVE-2026-23373 CVE-2026-23374 CVE-2026-23375 CVE-2026-23378                      CVE-2026-23379 CVE-2026-23380 CVE-2026-23381 CVE-2026-23382                      CVE-2026-23383 CVE-2026-23386 CVE-2026-23387 CVE-2026-23388                      CVE-2026-23389 CVE-2026-23391 CVE-2026-23392 CVE-2026-23393                      CVE-2026-23395 CVE-2026-23396 CVE-2026-23397 CVE-2026-23398                      CVE-2026-23399 CVE-2026-23401 CVE-2026-23412 CVE-2026-23413                      CVE-2026-23414 CVE-2026-23417 CVE-2026-23419 CVE-2026-23420                      CVE-2026-23422 CVE-2026-23426 CVE-2026-23427 CVE-2026-23428                      CVE-2026-23434 CVE-2026-23438 CVE-2026-23439 CVE-2026-23440                      CVE-2026-23441 CVE-2026-23442 CVE-2026-23444 CVE-2026-23445                      CVE-2026-23446 CVE-2026-23447 CVE-2026-23448 CVE-2026-23449                      CVE-2026-23450 CVE-2026-23452 CVE-2026-23454 CVE-2026-23455                      CVE-2026-23456 CVE-2026-23457 CVE-2026-23458 CVE-2026-23460                      CVE-2026-23461 CVE-2026-23462 CVE-2026-23463 CVE-2026-23464                      CVE-2026-23465 CVE-2026-23466 CVE-2026-23470 CVE-2026-23474                      CVE-2026-23475 CVE-2026-31389 CVE-2026-31391 CVE-2026-31392                      CVE-2026-31393 CVE-2026-31394 CVE-2026-31396 CVE-2026-31399                      CVE-2026-31400 CVE-2026-31401 CVE-2026-31402 CVE-2026-31403                      CVE-2026-31405 CVE-2026-31406 CVE-2026-31407 CVE-2026-31408                      CVE-2026-31409 CVE-2026-31410 CVE-2026-31411 CVE-2026-31412                      CVE-2026-31414 CVE-2026-31415 CVE-2026-31416 CVE-2026-31417                      CVE-2026-31418 CVE-2026-31421 CVE-2026-31422 CVE-2026-31423                      CVE-2026-31424 CVE-2026-31425 CVE-2026-31426 CVE-2026-31427                      CVE-2026-31428 CVE-2026-31429 CVE-2026-31430 CVE-2026-31431                      CVE-2026-31432 CVE-2026-31433 CVE-2026-31434 CVE-2026-31436                      CVE-2026-31438 CVE-2026-31439 CVE-2026-31440 CVE-2026-31441                      CVE-2026-31446 CVE-2026-31447 CVE-2026-31448 CVE-2026-31449                      CVE-2026-31450 CVE-2026-31451 CVE-2026-31452 CVE-2026-31453                      CVE-2026-31454 CVE-2026-31455 CVE-2026-31458 CVE-2026-31462                      CVE-2026-31464 CVE-2026-31466 CVE-2026-31467 CVE-2026-31469                      CVE-2026-31470 CVE-2026-31473 CVE-2026-31474 CVE-2026-31476                      CVE-2026-31477 CVE-2026-31478 CVE-2026-31479 CVE-2026-31480                      CVE-2026-31482 CVE-2026-31483 CVE-2026-31485 CVE-2026-31487                      CVE-2026-31488 CVE-2026-31489 CVE-2026-31492 CVE-2026-31494                      CVE-2026-31495 CVE-2026-31496 CVE-2026-31497 CVE-2026-31498                      CVE-2026-31500 CVE-2026-31502 CVE-2026-31503 CVE-2026-31504                      CVE-2026-31505 CVE-2026-31506 CVE-2026-31507 CVE-2026-31508                      CVE-2026-31509 CVE-2026-31510 CVE-2026-31511 CVE-2026-31512                      CVE-2026-31515 CVE-2026-31516 CVE-2026-31518 CVE-2026-31519                      CVE-2026-31520 CVE-2026-31521 CVE-2026-31522 CVE-2026-31523                      CVE-2026-31524 CVE-2026-31525 CVE-2026-31527 CVE-2026-31528                      CVE-2026-31530 CVE-2026-31531 CVE-2026-31532 CVE-2026-31533                      CVE-2026-31540 CVE-2026-31542 CVE-2026-31545 CVE-2026-31546                      CVE-2026-31548 CVE-2026-31549 CVE-2026-31550 CVE-2026-31551                      CVE-2026-31552 CVE-2026-31554 CVE-2026-31555 CVE-2026-31556                      CVE-2026-31557 CVE-2026-31558 CVE-2026-31559 CVE-2026-31561                      CVE-2026-31563 CVE-2026-31565 CVE-2026-31566 CVE-2026-31570                      CVE-2026-31575 CVE-2026-31576 CVE-2026-31577 CVE-2026-31578                      CVE-2026-31580 CVE-2026-31581 CVE-2026-31582 CVE-2026-31583                      CVE-2026-31584 CVE-2026-31585 CVE-2026-31586 CVE-2026-31587                      CVE-2026-31588 CVE-2026-31590 CVE-2026-31593 CVE-2026-31594                      CVE-2026-31595 CVE-2026-31596 CVE-2026-31597 CVE-2026-31598                      CVE-2026-31599 CVE-2026-31602 CVE-2026-31603 CVE-2026-31604                      CVE-2026-31605 CVE-2026-31606 CVE-2026-31607 CVE-2026-31610                      CVE-2026-31611 CVE-2026-31612 CVE-2026-31614 CVE-2026-31615                      CVE-2026-31616 CVE-2026-31617 CVE-2026-31618 CVE-2026-31619                      CVE-2026-31622 CVE-2026-31623 CVE-2026-31624 CVE-2026-31625                      CVE-2026-31626 CVE-2026-31627 CVE-2026-31628 CVE-2026-31629                      CVE-2026-31634 CVE-2026-31637 CVE-2026-31638 CVE-2026-31639                      CVE-2026-31642 CVE-2026-31644 CVE-2026-31645 CVE-2026-31646                      CVE-2026-31647 CVE-2026-31648 CVE-2026-31649 CVE-2026-31651                      CVE-2026-31655 CVE-2026-31656 CVE-2026-31657 CVE-2026-31658                      CVE-2026-31659 CVE-2026-31660 CVE-2026-31661 CVE-2026-31662                      CVE-2026-31664 CVE-2026-31665 CVE-2026-31666 CVE-2026-31667                      CVE-2026-31668 CVE-2026-31669 CVE-2026-31670 CVE-2026-31671                      CVE-2026-31672 CVE-2026-31673 CVE-2026-31674 CVE-2026-31675                      CVE-2026-31676 CVE-2026-31677 CVE-2026-31678 CVE-2026-31679                      CVE-2026-31680 CVE-2026-31681 CVE-2026-31682 CVE-2026-31683                      CVE-2026-31684 CVE-2026-31685 CVE-2026-31686 CVE-2026-31689                      CVE-2026-31693 CVE-2026-31786 CVE-2026-31787 CVE-2026-31788

    Several vulnerabilities have been discovered in the Linux kernel that     may lead to a privilege escalation, denial of service or information     leaks.

    For the stable distribution (trixie), these problems have been fixed in     version 6.12.85-1.

    We recommend that you upgrade your linux packages.

    For the detailed security status of linux please refer to its security     tracker page at:
    https://security-tracker.debian.org/tracker/linux

    Further information about Debian Security Advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://www.debian.org/security/

    Mailing list: debian-security-announce@lists.debian.org

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - net: skb: fix cross-cache free of KFENCE-allocated skb head SKB_SMALL_HEAD_CACHE_SIZE is intentionally set     to a non-power-of-2 value (e.g. 704 on x86_64) to avoid collisions with generic kmalloc bucket sizes. This     ensures that skb_kfree_head() can reliably use skb_end_offset to distinguish skb heads allocated from     skb_small_head_cache vs. generic kmalloc caches. However, when KFENCE is enabled, kfence_ksize() returns     the exact requested allocation size instead of the slab bucket size. If a caller (e.g. bpf_test_init)     allocates skb head data via kzalloc() and the requested size happens to equal SKB_SMALL_HEAD_CACHE_SIZE,     then slab_build_skb() -> ksize() returns that exact value. After subtracting skb_shared_info overhead,     skb_end_offset ends up matching SKB_SMALL_HEAD_HEADROOM, causing skb_kfree_head() to incorrectly free the     object to skb_small_head_cache instead of back to the original kmalloc cache, resulting in a slab cross-     cache free: kmem_cache_free(skbuff_small_head): Wrong slab cache. Expected skbuff_small_head but got     kmalloc-1k Fix this by always calling kfree(head) in skb_kfree_head(). This keeps the free path generic     and avoids allocator-specific misclassification for KFENCE objects. (CVE-2026-31429)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
307606	Linux Distros 未修补的漏洞：CVE-2026-31429	Nessus	Misc.	2026/4/20	2026/4/28	medium
307606	Linux Distros 未修補的弱點：CVE-2026-31429	Nessus	Misc.	2026/4/20	2026/4/28	medium
307606	Linux Distros のパッチ未適用の脆弱性: CVE-2026-31429	Nessus	Misc.	2026/4/20	2026/4/28	medium
311299	Debian dsa-6238 : ata-modules-6.12.74+deb13+1-armmp-di - security update	Nessus	Debian Local Security Checks	2026/4/30	2026/4/30	high
307606	Linux Distros Unpatched Vulnerability : CVE-2026-31429	Nessus	Misc.	2026/4/20	2026/4/28	medium

检测

插件搜索

medium

medium

medium

high

medium