CVE-2026-99030High· 7.5▾ TwilightIn the Linux kernel, the following vulnerability has been resolved: net: skbuff: don't leave stale bytes in skb_copy_and_csum_bits() When skb_copy_and_csum_bits() reaches unreadable frags it returns 0 after copying only the linear part…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Oct 24.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
— → 7.5
none → high
0.2% → 0.5%
In the Linux kernel, the following vulnerability has been resolved:
net: skbuff: don't leave stale bytes in skb_copy_and_csum_bits()
When skb_copy_and_csum_bits() reaches unreadable frags it returns 0 after copying only the linear part, and the rest of the caller's buffer is left as it was. The callers copy into a buffer that is about to go out on the wire: an ICMP error quoting the offending packet, or a driver's TX bounce buffer in skb_copy_and_csum_dev(). Neither buffer is zeroed beforehand, so whatever was in memory there gets sent.
Zero the part of the buffer we didn't fill. The checksum usually won't match the data any more, so the receiver will usually drop the packet, but either way it no longer carries anything it shouldn't. Only zero for a positive @len, a negative one from a broken caller must not turn into a huge memset().
Linux >= 65249feb6b3df9e17bab5911ee56fa7b0971e231 < 5f19b9cfff79508e8cb09be40d014cb0807f3854Linux >= 65249feb6b3df9e17bab5911ee56fa7b0971e231 < 5551399751e2c9f31e4f3428040985a07e79d9c2Linux >= 65249feb6b3df9e17bab5911ee56fa7b0971e231 < 39d1a6b601831237c6038b5e3ac8dbb883c1700aLinux >= 65249feb6b3df9e17bab5911ee56fa7b0971e231 < ab9414ed70bd783e902a85c350620dee269bcb2bLinux 6.12Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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