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)
Assigner
References
8 references
Impacted products
2 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) |
|
| 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) |
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}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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