net: usb: cx82310_eth: drop URB after 0xffff reboot sentinel to prevent partial_data heap overflow

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Summary

CVECVE-2026-98025
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:31 UTC
Updated2026-09-25 11:17:31 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: net: usb: cx82310_eth: drop URB after 0xffff reboot sentinel to prevent partial_data heap overflow The 0xffff length sentinel detects a router reboot and schedules re-enabling of ethernet mode, but then falls through to the rest of the loop body. The next check is } else if (len > CX82310_MTU) { which is the else of the just-matched if -- it never fires for len == 0xffff. The MTU bound that normally caps the incomplete-packet save path is silently bypassed. With 0xffff > skb->len always true (rx_urb_size is 4096), the incomplete-packet branch saves dev->partial_len = skb->len bytes into dev->partial_data. partial_data is kmalloc(hard_mtu) = kmalloc(CX82310_MTU + 2) = 1516 bytes, but skb->len after the 2-byte header pull can be up to 4094. A device that sends a 4096-byte URB starting with [0xff 0xff] therefore copies 4094 device-provided bytes into a buffer allocated for 1516 bytes, exceeding its requested size by 2578 bytes. The next URB then reads dev->partial_len (4094) back from the same 1516-byte buffer and dev->partial_rem (65535 - 4094 = 61441) from the new URB's ~4KB skb, both well past their allocations, and delivers the spliced result as a 64KB "frame" to the network stack. Bail out of rx_fixup after scheduling the re-enable work; the remainder of a reboot-marker URB is not meaningful packet data. This restores the invariant that partial_len < CX82310_MTU + 2 on the save path, since every other route there has already passed the MTU check.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808 3bd689409bb1c93bdc6dd8ec6cbf5161bc4f0287 git Not specified
CNA Linux Linux affected ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808 659654654eb140851467af41d610473c100c7975 git Not specified
CNA Linux Linux affected ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808 237c9ae7145772af147e4665f158938350fa5658 git Not specified
CNA Linux Linux affected ca139d76b0d9e59d18f2d2ec8f0d81b82acd6808 5d50e90add8b4a978395e893e81954d19d58a7c5 git Not specified
CNA Linux Linux affected 5adf7fbdfa3e9e425b04771e1d64c4e184ad8fdb git Not specified
CNA Linux Linux affected c1b187a86a176e42f5e48066556980e3232b6cab git Not specified
CNA Linux Linux affected 4.19.322 4.20 semver Not specified
CNA Linux Linux affected 5.4.284 5.5 semver Not specified
CNA Linux Linux affected 5.10 Not specified
CNA Linux Linux unaffected 5.10 semver Not specified
CNA Linux Linux unaffected 6.12.111 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/659654654eb140851467af41d610473c100c7975 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3bd689409bb1c93bdc6dd8ec6cbf5161bc4f0287 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/237c9ae7145772af147e4665f158938350fa5658 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5d50e90add8b4a978395e893e81954d19d58a7c5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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