CVE-2026-31649
published 2026-04-24CVE-2026-31649: In the Linux kernel, the following vulnerability has been resolved: net: stmmac: fix integer underflow in chain mode The jumbo_frm() chain-mode implementation…
PriorityP351critical9.8CVSS 3.1
AVNACLPRNUINSUCHIHAH
EPSS
0.46%
37.3th percentile
In the Linux kernel, the following vulnerability has been resolved:
net: stmmac: fix integer underflow in chain mode
The jumbo_frm() chain-mode implementation unconditionally computes
len = nopaged_len - bmax;
where nopaged_len = skb_headlen(skb) (linear bytes only) and bmax is
BUF_SIZE_8KiB or BUF_SIZE_2KiB. However, the caller stmmac_xmit()
decides to invoke jumbo_frm() based on skb->len (total length including
page fragments):
is_jumbo = stmmac_is_jumbo_frm(priv, skb->len, enh_desc);
When a packet has a small linear portion (nopaged_len len > bmax), the
subtraction wraps as an unsigned integer, producing a huge len value
(~0xFFFFxxxx). This causes the while (len != 0) loop to execute
hundreds of thousands of iterations, passing skb->data + bmax * i
pointers far beyond the skb buffer to dma_map_single(). On IOMMU-less
SoCs (the typical deployment for stmmac), this maps arbitrary kernel
memory to the DMA engine, constituting a kernel memory disclosure and
potential memory corruption from hardware.
Fix this by introducing a buf_len local variable clamped to
min(nopaged_len, bmax). Computing len = nopaged_len - buf_len is then
always safe: it is zero when the linear portion fits within a single
descriptor, causing the while (len != 0) loop to be skipped naturally,
and the fragment loop in stmmac_xmit() handles page fragments afterward.
Affected
70 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linux | linux | — | — |
| linux | linux | >= 286a837217204b1ef105e3a554d0757e4fdfaac1 < 513e06735f5be575b409d195822195348b164e48 | 513e06735f5be575b409d195822195348b164e48 |
| linux | linux | >= 286a837217204b1ef105e3a554d0757e4fdfaac1 < 275bdf762e82082f064e60a92448fa2ac43cf95b | 275bdf762e82082f064e60a92448fa2ac43cf95b |
| linux | linux | >= 286a837217204b1ef105e3a554d0757e4fdfaac1 < a2b68a9a476b9544ff31f1fbcd5d80867a8a5e2f | a2b68a9a476b9544ff31f1fbcd5d80867a8a5e2f |
| linux | linux | >= 286a837217204b1ef105e3a554d0757e4fdfaac1 < b7b8012193fd98236d7ae05d4b553f010a77b2ef | b7b8012193fd98236d7ae05d4b553f010a77b2ef |
| linux | linux | >= 286a837217204b1ef105e3a554d0757e4fdfaac1 < 2c91b39912278d0878f9ba60ba04d2518b18a08d | 2c91b39912278d0878f9ba60ba04d2518b18a08d |
| linux | linux | >= 286a837217204b1ef105e3a554d0757e4fdfaac1 < 6fca757c20396dc2e604dcc61922264e9e3dc803 | 6fca757c20396dc2e604dcc61922264e9e3dc803 |
| linux | linux | >= 286a837217204b1ef105e3a554d0757e4fdfaac1 < 10d12b9240ebf96c785f0e2e4228318cd5f3a3eb | 10d12b9240ebf96c785f0e2e4228318cd5f3a3eb |
| linux | linux | >= 286a837217204b1ef105e3a554d0757e4fdfaac1 < 51f4e090b9f87b40c21b6daadb5c06e6c0a07b67 | 51f4e090b9f87b40c21b6daadb5c06e6c0a07b67 |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 3.2.1 < 5.10.253 | 5.10.253 |
| linux | linux_kernel | >= 5.11 < 5.15.203 | 5.15.203 |
| linux | linux_kernel | >= 5.16 < 6.1.169 | 6.1.169 |
| linux | linux_kernel | >= 6.13 < 6.18.23 | 6.18.23 |
| linux | linux_kernel | >= 6.19 < 6.19.13 | 6.19.13 |
| linux | linux_kernel | >= 6.2 < 6.6.135 | 6.6.135 |
| linux | linux_kernel | >= 6.7 < 6.12.82 | 6.12.82 |
CVSS provenance
nvdv3.19.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vendor_ubuntu8.8HIGH
vendor_redhat7.0HIGH
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- IOMMU subsystem;
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- NVME drivers;
- x86 platform drivers;
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- SPI subsystem;
- TCM subsystem;
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- ATM drivers;
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Red Hat
kernel: net: stmmac: fix integer underflow in chain mode
vendor_redhat·2026-04-24·CVSS 7.0
CVE-2026-31649 [HIGH] CWE-191 kernel: net: stmmac: fix integer underflow in chain mode
kernel: net: stmmac: fix integer underflow in chain mode
A flaw was found in the Linux kernel's stmmac network driver. An integer underflow vulnerability in the `jumbo_frm()` function, when processing specially crafted fragmented network packets, can lead to a memory disclosure and potential memory corruption. This issue allows an attacker to read arbitrary kernel memory and potentially corrupt it, impacting the system's integrity and confidentiality.
Package: kernel (Red Hat Enterprise Linux 10) - Affected
Package: kernel (Red Hat Enterprise Linux 6) - Not affected
Package: kernel (Red Hat Enterprise Linux 7) - Not affected
Package: kernel-rt (Red Hat Enterprise Linux 7) - Not affected
Package: kernel (Red Hat Enterprise Linux 8) - Affected
Package: kernel-rt (Red Hat Enterprise Li
VulDB
Linux Kernel up to 6.19.12 jumbo_frm len integer underflow
vuldb·2026-04-24
CVE-2026-31649 [CRITICAL] Linux Kernel up to 6.19.12 jumbo_frm len integer underflow
A vulnerability categorized as critical has been discovered in Linux Kernel up to 6.19.12. This vulnerability affects the function jumbo_frm. The manipulation of the argument len results in integer underflow.
This vulnerability is reported as CVE-2026-31649. The attacker must have access to the local network to execute the attack. No exploit exists.
It is advisable to upgrade the affected component.
GHSA
GHSA-jv6m-v86w-343p: In the Linux kernel, the following vulnerability has been resolved:
net: stmmac: fix integer underflow in chain mode
The jumbo_frm() chain-mode impl
ghsa_unreviewed·2026-04-24
CVE-2026-31649 GHSA-jv6m-v86w-343p: In the Linux kernel, the following vulnerability has been resolved:
net: stmmac: fix integer underflow in chain mode
The jumbo_frm() chain-mode impl
In the Linux kernel, the following vulnerability has been resolved:
net: stmmac: fix integer underflow in chain mode
The jumbo_frm() chain-mode implementation unconditionally computes
len = nopaged_len - bmax;
where nopaged_len = skb_headlen(skb) (linear bytes only) and bmax is
BUF_SIZE_8KiB or BUF_SIZE_2KiB. However, the caller stmmac_xmit()
decides to invoke jumbo_frm() based on skb->len (total length including
page fragments):
is_jumbo = stmmac_is_jumbo_frm(priv, skb->len, enh_desc);
When a packet has a small linear portion (nopaged_len len > bmax), the
subtraction wraps as an unsigned integer, producing a huge len value
(~0xFFFFxxxx). This causes the while (len != 0) loop to execute
hundreds of thousands of iterations, passing skb->data + bmax * i
pointers far beyond the skb buff
No detection rules found.
No public exploits indexed.
https://git.kernel.org/stable/c/10d12b9240ebf96c785f0e2e4228318cd5f3a3ebhttps://git.kernel.org/stable/c/275bdf762e82082f064e60a92448fa2ac43cf95bhttps://git.kernel.org/stable/c/2c91b39912278d0878f9ba60ba04d2518b18a08dhttps://git.kernel.org/stable/c/513e06735f5be575b409d195822195348b164e48https://git.kernel.org/stable/c/51f4e090b9f87b40c21b6daadb5c06e6c0a07b67https://git.kernel.org/stable/c/6fca757c20396dc2e604dcc61922264e9e3dc803https://git.kernel.org/stable/c/a2b68a9a476b9544ff31f1fbcd5d80867a8a5e2fhttps://git.kernel.org/stable/c/b7b8012193fd98236d7ae05d4b553f010a77b2efhttps://cert-portal.siemens.com/productcert/html/ssa-019113.htmlhttps://cert-portal.siemens.com/productcert/html/ssa-082556.html
2026-04-24
Published