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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2026-93105

esp: do not unref managed frag pages in esp_ssg_unref()

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: esp: do not unref managed frag pages in esp_ssg_unref() esp_ssg_unref() releases the page references held on the source scatterlist after the AEAD operation completes. It calls skb_page_unref() on every frag page for an out-of-place transform (req->src != req->dst), and in the error path of esp_output_tail() (already_unref == true) on the request's own scatterlist. This is wrong when the skb carries managed frags (SKBFL_MANAGED_FRAG_REFS). Managed frags are owned by a zerocopy ubuf and the skb does not hold a per-frag page reference; io_uring SEND_ZC with a registered buffer attaches the bvec pages this way via io_sg_from_iter(). The rest of the stack honours this invariant: skb_release_data() skips the per-frag unref when SKBFL_MANAGED_FRAG_REFS is set, and skb_zcopy_managed() is the guard used at the other unref sites. esp_ssg_unref() is missing that guard, so for a managed-frag skb it drops a page reference the skb never acquired. This can underflow the page reference count and free a page that is still in use. Guard the function with skb_zcopy_managed() so both unref paths are skipped for managed-frag skbs, matching skb_release_data().

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • cac2661c53f35cbe651bef9b07026a5a05ab8ce0 to < cb375965800d474c0281a2e92c43c724fce9f463affected
  • cac2661c53f35cbe651bef9b07026a5a05ab8ce0 to < 201bdf10ae92e7cbd524adf8c0323e2a963d5fd7affected
  • cac2661c53f35cbe651bef9b07026a5a05ab8ce0 to < 3ec55f0c8a6a543cf660584d1346e11f6311ee59affected
  • cac2661c53f35cbe651bef9b07026a5a05ab8ce0 to < 1ad6456898f6e6cf58be83bdb607acb1119a9cd1affected
  • cac2661c53f35cbe651bef9b07026a5a05ab8ce0 to < 26b6b14c7a0368e317a1e9fb5144ebe6f8d495cfaffected
  • cac2661c53f35cbe651bef9b07026a5a05ab8ce0 to < 21697720ff43b8dfa25b8e8d9ca7f56f4597fc80affected

Linux Linux

Default version status: affected

  • 4.11affected
  • 0 to < 4.11unaffected
  • 6.1.191 to ≤ 6.1.*unaffected
  • 6.6.160 to ≤ 6.6.*unaffected
  • 6.12.114 to ≤ 6.12.*unaffected
  • 6.18.57 to ≤ 6.18.*unaffected
  • 7.2.6 to ≤ 7.2.*unaffected
  • 7.3 to ≤ *unaffected

References