PT-2026-43807 · Linux · Linux
Published
2026-05-27
·
Updated
2026-05-27
·
CVE-2026-45940
None
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In the Linux kernel, the following vulnerability has been resolved:
net: stmmac: fix oops when split header is enabled
For GMAC4, when split header is enabled, in some rare cases, the
hardware does not fill buf2 of the first descriptor with payload.
Thus we cannot assume buf2 is always fully filled if it is not
the last descriptor. Otherwise, the length of buf2 of the second
descriptor will be calculated wrong and cause an oops:
Unable to handle kernel paging request at virtual address ffff00019246bfc0
...
x2 : 0000000000000040 x1 : ffff00019246bfc0 x0 : ffff00009246c000
Call trace:
dcache inval poc+0x28/0x58 (P)
dma direct sync single for cpu+0x38/0x6c
dma sync single for cpu+0x34/0x6c
stmmac napi poll rx+0x8f0/0xb60
napi poll.constprop.0+0x30/0x144
net rx action+0x160/0x274
handle softirqs+0x1b8/0x1fc
...
To fix this, the PL bit-field in RDES3 register is used for all
descriptors, whether it is the last descriptor or not.
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Related Identifiers
Affected Products
Linux