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CVE-2026-22979: Linux

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Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

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    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: net: fix memory leak in skb_segment_list for GRO packets When skb_segment_list() is called during packet forwarding, it handles packets that were aggregated by the GRO engine. Historically, the segmentation logic in skb_segment_list assumes that individual segments are split from a parent SKB and may need to carry their own socket memory accounting. Accordingly, the code transfers truesize from the parent to the newly created segments. Prior to commit ed4cccef64c1 ("gro: fix ownership transfer"), this truesize subtraction in skb_segment_list() was valid because fragments still carry a reference to the original socket. However, commit ed4cccef64c1 ("gro: fix ownership transfer") changed this behavior by ensuring that fraglist entries are explicitly orphaned (skb->sk = NULL) to prevent illegal orphaning later in the stack. This change meant that the entire socket memory charge remained with the head SKB, but the corresponding accounting logic in skb_segment_list() was never updated. As a result, the current code unconditionally adds each fragment's truesize to delta_truesize and subtracts it from the parent SKB. Since the fragments are no longer charged to the socket, this subtraction results in an effective under-count of memory when the head is freed. This causes sk_wmem_alloc to remain non-zero, preventing socket destruction and leading to a persistent memory leak. The leak can be observed via KMEMLEAK when tearing down the networking environment: unreferenced object 0xffff8881e6eb9100 (size 2048): comm "ping", pid 6720, jiffies 4295492526 backtrace: kmem_cache_alloc_noprof+0x5c6/0x800 sk_prot_alloc+0x5b/0x220 sk_alloc+0x35/0xa00 inet6_create.part.0+0x303/0x10d0 __sock_create+0x248/0x640 __sys_socket+0x11b/0x1d0 Since skb_segment_list() is exclusively used for SKB_GSO_FRAGLIST packets constructed by GRO, the truesize adjustment is removed. The call to skb_relea

    Засегнати продукти

    • Linux Linux: 2eeab8c47c3c0276e0746bc382f405c9a236a5ad преди 0b27828ebd1ed3107d7929c3737adbe862e99e74; fc126c1d51e9552eacd2d717b9ffe9262a8a4cd6 преди 88bea149db2057112af3aaf63534b24fab5858ab; ed4cccef64c1d0d5b91e69f7a8a6697c3a865486 преди 3264881431e308b9c72cb8a0159d57a56d67dd79; ed4cccef64c1d0d5b91e69f7a8a6697c3a865486 преди c114a32a2e70b82d447f409f7ffcfa3058f9d5bd; ed4cccef64c1d0d5b91e69f7a8a6697c3a865486 преди 238e03d0466239410b72294b79494e43d4fabe77; d225b0ac96dc40d7e8ae2bc227eb2c56e130975f; 5b3b67f731296027cceb3efad881ae281213f86f; 6.1.85 преди 6.1.161; 6.6.26 преди 6.6.121; 5.15.154 преди 5.16; 6.8.5 преди 6.9
    • Linux Linux: 6.9; преди 6.9; 6.1.161 до 6.1.*; 6.6.121 до 6.6.*; 6.12.66 до 6.12.*; 6.18.6 до 6.18.*; от 6.19 нататък
    • Siemens: още 3 продукта, добавени от Siemens

      SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP, SIPLUS S7-1500 CPU 1518-4 PN/DP MFP

    История

    • 23 януари 2026 Публикувано

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