CVE-2026-53223 (GCVE-0-2026-53223)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-06-28 06:40
VLAI
Title
net: guard timestamp cmsgs to real error queue skbs
Summary
In the Linux kernel, the following vulnerability has been resolved: net: guard timestamp cmsgs to real error queue skbs skb_is_err_queue() treats PACKET_OUTGOING as the sole marker for an skb from sk_error_queue. That assumption is not true for AF_PACKET sockets: outgoing packet taps are also delivered to packet sockets with skb->pkt_type == PACKET_OUTGOING, but their skb->cb is owned by AF_PACKET instead of struct sock_exterr_skb. If such an skb is received with timestamping enabled, the generic timestamp cmsg path can read AF_PACKET control-buffer state as sock_exterr_skb::opt_stats. With SO_RXQ_OVFL enabled, the packet drop counter overlaps opt_stats. An odd drop count makes the path emit SCM_TIMESTAMPING_OPT_STATS with skb->len and skb->data. For non-linear skbs this copies past the linear head and can trigger hardened usercopy or disclose adjacent heap contents. Keep skb_is_err_queue() local to net/socket.c, but make it verify that the PACKET_OUTGOING marker is paired with the sock_rmem_free destructor installed by sock_queue_err_skb(). AF_PACKET receive skbs use normal receive ownership and no longer pass as error-queue skbs, while legitimate sk_error_queue entries keep the PACKET_OUTGOING marker and sock_rmem_free ownership.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 8605330aac5a5785630aec8f64378a54891937cc , < 24a0d548d3a765cd4558224e4f8e06e14cba26e3 (git)
Affected: 8605330aac5a5785630aec8f64378a54891937cc , < 71ff5cdd5da61d0438e902aa0fd68c28bc901abe (git)
Affected: 8605330aac5a5785630aec8f64378a54891937cc , < ad9a0374ee6d11048e1f74cd5180bad58b9848b4 (git)
Affected: 8605330aac5a5785630aec8f64378a54891937cc , < b903e9b5629ec8dd6db92174070045bf81ad7060 (git)
Affected: 8605330aac5a5785630aec8f64378a54891937cc , < e0665b2a8e90bb08bd205062c75662b502d31797 (git)
Affected: 8605330aac5a5785630aec8f64378a54891937cc , < 3dde4fb941fa5649ab809f6cd3e20e0c424a4e31 (git)
Affected: 8605330aac5a5785630aec8f64378a54891937cc , < eb51a9ad3ceb01bc6c0fb608dbc856e03ee6f24a (git)
Affected: 8605330aac5a5785630aec8f64378a54891937cc , < 1ee90b77b727df903033db873c75caac5c27ec98 (git)
Affected: cdaf15b43bd31003220cb080bcbbd57787a2fca9 (git)
Affected: 4.10.14 , < 4.11 (semver)
Create a notification for this product.
Linux Linux Affected: 4.11
Unaffected: 0 , < 4.11 (semver)
Unaffected: 5.10.259 , ≤ 5.10.* (semver)
Unaffected: 5.15.210 , ≤ 5.15.* (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.94 , ≤ 6.12.* (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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  }
}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.