CVE-2026-53366ipv4: account for fraggap on the paged allocation path
- 7.8HighCVSS base score
- 0.17%Exploitation in 30 daysEPSS · top 93% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: ipv4: account for fraggap on the paged allocation path In __ip_append_data(), when the paged-allocation branch is taken, alloclen and pagedlen are computed as alloclen = fragheaderlen + transhdrlen; pagedlen = datalen - transhdrlen; datalen already includes fraggap, but the fraggap bytes carried over from the previous skb are copied into the new skb's linear area at offset transhdrlen by the subsequent skb_copy_and_csum_bits(). The linear area is therefore undersized by fraggap bytes while pagedlen is overstated by the same amount. The non-paged branch sets alloclen to fraglen, which already accounts for fraggap because datalen does. Bring the paged branch in line by adding fraggap to alloclen and subtracting it from pagedlen. After this adjustment, copy no longer collapses to -fraggap on the paged path, so remove the stale comment describing that old arithmetic.
Timeline
ID reserved
By Linux
- 37 days later
· 37 days later
Published
- 3 months later
· 3 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.17% · top 93% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 8eb77cc73977d88787b37c92831b1c242e035396 – < 5c6375bced6147ec2e460ee3b653f4860d5ecdc2
- affected 8eb77cc73977d88787b37c92831b1c242e035396 – < ce494707a9c07f27c219ca67f3e138061f53d9b3
- affected 8eb77cc73977d88787b37c92831b1c242e035396 – < a9c24eda24bd15f432e37824e6fc440977cb241c
- affected 8eb77cc73977d88787b37c92831b1c242e035396 – < 77798d7be6ef71e72fb6fc8a2901bf74ebc9706f
- affected 8eb77cc73977d88787b37c92831b1c242e035396 – < c04d9ece23deb9e26c19f9ca215e98b3295aa1bb
- affected 8eb77cc73977d88787b37c92831b1c242e035396 – < eca856950f7cb1a221e02b99d758409f2c5cec42
- affected 6.0
- unaffected < 6.0
- unaffected 6.1.178 – ≤ 6.1.*
- unaffected 6.6.144 – ≤ 6.6.*
- unaffected 6.12.95 – ≤ 6.12.*
- unaffected 6.18.38 – ≤ 6.18.*
- unaffected 7.1.3 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References6
- https://git.kernel.org/stable/c/5c6375bced6147ec2e460ee3b653f4860d5ecdc2 (opens in a new tab)
- https://git.kernel.org/stable/c/ce494707a9c07f27c219ca67f3e138061f53d9b3 (opens in a new tab)
- https://git.kernel.org/stable/c/a9c24eda24bd15f432e37824e6fc440977cb241c (opens in a new tab)
- https://git.kernel.org/stable/c/77798d7be6ef71e72fb6fc8a2901bf74ebc9706f (opens in a new tab)
- https://git.kernel.org/stable/c/c04d9ece23deb9e26c19f9ca215e98b3295aa1bb (opens in a new tab)
- https://git.kernel.org/stable/c/eca856950f7cb1a221e02b99d758409f2c5cec42 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-44868 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-53366)Record last updated .