CVE-2024-56719: Linux Kernel vulnerability (CVSS 10.0)

Description

In the Linux kernel, the following vulnerability has been resolved: net: stmmac: fix TSO DMA API usage causing oops Commit 66600fac7a98 ("net: stmmac: TSO: Fix unbalanced DMA map/unmap for non-paged SKB data") moved the assignment of tx_skbuff_dma[]'s members to be later in stmmac_tso_xmit(). The buf (dma cookie) and len stored in this structure are passed to dma_unmap_single() by stmmac_tx_clean(). The DMA API requires that the dma cookie passed to dma_unmap_single() is the same as the value returned from dma_map_single(). However, by moving the assignment later, this is not the case when priv->dma_cap.addr64 > 32 as "des" is offset by proto_hdr_len. This causes problems such as: dwc-eth-dwmac 2490000.ethernet eth0: Tx DMA map failed and with DMA_API_DEBUG enabled: DMA-API: dwc-eth-dwmac 2490000.ethernet: device driver tries to +free DMA memory it has not allocated [device address=0x000000ffffcf65c0] [size=66 bytes] Fix this by maintaining "des" as the original DMA cookie, and use tso_des to pass the offset DMA cookie to stmmac_tso_allocator(). Full details of the crashes can be found at: https://lore.kernel.org/all/[email protected]/ https://lore.kernel.org/all/klkzp5yn5kq5efgtrow6wbvnc46bcqfxs65nz3qy77ujr5turc@bwwhelz2l4dw/

CVSS 3.1 breakdown

Attack vectorNetwork

Attack complexityLow

Privileges requiredNone

User interactionNone

ScopeChanged

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected products

Linux Kernel≥ 5.15.171 < 5.16 · ≥ 6.1.116 < 6.2 · ≥ 6.11.7 < 6.12.7 · ≥ 6.6.60 < 6.6.68

Remediation

Fixed in

Linux Kernel≥ 5.16

Patch & vendor advisories

References

Frequently asked

Is CVE-2024-56719 being actively exploited?

CVE-2024-56719 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.50%.

How severe is CVE-2024-56719?

CVE-2024-56719 has a CVSS 3.1 base score of 10.0, rated critical. EPSS estimates a 0.50% probability of exploitation.

Which products are affected by CVE-2024-56719?

Affected products include Linux Kernel.

How do I fix CVE-2024-56719?

Upgrade affected software to a fixed version, for example Linux Kernel 5.16 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2024-56719 against the real software inventory on every managed device, every day. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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