Description
In the Linux kernel, the following vulnerability has been resolved: vsock: Ignore signal/timeout on connect() if already established During connect(), acting on a signal/timeout by disconnecting an already established socket leads to several issues: 1. connect() invoking vsock_transport_cancel_pkt() -> virtio_transport_purge_skbs() may race with sendmsg() invoking virtio_transport_get_credit(). This results in a permanently elevated `vvs->bytes_unsent`. Which, in turn, confuses the SOCK_LINGER handling. 2. connect() resetting a connected socket's state may race with socket being placed in a sockmap. A disconnected socket remaining in a sockmap breaks sockmap's assumptions. And gives rise to WARNs. 3. connect() transitioning SS_CONNECTED -> SS_UNCONNECTED allows for a transport change/drop after TCP_ESTABLISHED. Which poses a problem for any simultaneous sendmsg() or connect() and may result in a use-after-free/null-ptr-deref. Do not disconnect socket on signal/timeout. Keep the logic for unconnected sockets: they don't linger, can't be placed in a sockmap, are rejected by sendmsg(). [1]: https://lore.kernel.org/netdev/e07fd95c-9a38-4eea-9638-133e38c2ec9b@rbox.co/ [2]: https://lore.kernel.org/netdev/20250317-vsock-trans-signal-race-v4-0-fc8837f3f1d4@rbox.co/ [3]: https://lore.kernel.org/netdev/60f1b7db-3099-4f6a-875e-af9f6ef194f6@rbox.co/
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
d021c344051af91f42c5ba9fdedc176740cbd238 to < 3f71753935d648082a8279a97d30efe6b85be680affectedd021c344051af91f42c5ba9fdedc176740cbd238 to < da664101fb4a0de5cb70d2bae6a650df954df2afaffectedd021c344051af91f42c5ba9fdedc176740cbd238 to < 67432915145848658149683101104e32f9fd6559affectedd021c344051af91f42c5ba9fdedc176740cbd238 to < eeca93f06df89be5a36305b7b9dae1ed65550dfcaffectedd021c344051af91f42c5ba9fdedc176740cbd238 to < 5998da5a8208ae9ad7838ba322bccb2bdcd95e81affectedd021c344051af91f42c5ba9fdedc176740cbd238 to < f1c170cae285e4b8f61be043bb17addc3d0a14b5affectedd021c344051af91f42c5ba9fdedc176740cbd238 to < ab6b19f690d89ae4709fba73a3c4a7911f495b7aaffectedd021c344051af91f42c5ba9fdedc176740cbd238 to < 002541ef650b742a198e4be363881439bb9d86b4affected
Linux Linux
Default version status: affected
3.9affected0 to < 3.9unaffected5.4.302 to ≤ 5.4.*unaffected5.10.247 to ≤ 5.10.*unaffected5.15.197 to ≤ 5.15.*unaffected6.1.159 to ≤ 6.1.*unaffected6.6.118 to ≤ 6.6.*unaffected6.12.60 to ≤ 6.12.*unaffected6.17.10 to ≤ 6.17.*unaffected6.18 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/3f71753935d648082a8279a97d30efe6b85be680 ↗
- https://git.kernel.org/stable/c/da664101fb4a0de5cb70d2bae6a650df954df2af ↗
- https://git.kernel.org/stable/c/67432915145848658149683101104e32f9fd6559 ↗
- https://git.kernel.org/stable/c/eeca93f06df89be5a36305b7b9dae1ed65550dfc ↗
- https://git.kernel.org/stable/c/5998da5a8208ae9ad7838ba322bccb2bdcd95e81 ↗
- https://git.kernel.org/stable/c/f1c170cae285e4b8f61be043bb17addc3d0a14b5 ↗
- https://git.kernel.org/stable/c/ab6b19f690d89ae4709fba73a3c4a7911f495b7a ↗
- https://git.kernel.org/stable/c/002541ef650b742a198e4be363881439bb9d86b4 ↗
- https://cert-portal.siemens.com/productcert/html/ssa-253495.html ↗